© 2008 Horizon Hobby, Inc . 4105 Fieldstone Road Champaign, Illinois 61822

© 2008 Horizon Hobby, Inc . 4105 Fieldstone Road Champaign, Illinois 61822
© 2008 Horizon Hobby, Inc.
4105 Fieldstone Road
Champaign, Illinois 61822
(877) 504-0233
Horizon Hobby UK
Units 1-4 Ployters Rd
Staple Tye
Harlow, Essex
CM18 7NS
United Kingdom
Horizon Hobby Deutschland GmbH
Hamburger Strasse 10
25335 Elmshorn
Germany
Patents pending
DSM and DSM2 are trademarks or registered trademarks of Horizon Hobby, Inc. The Spektrum trademark is
used with permission of Bachmann Industries, Inc. Spektrum radios and accessories are exclusively available from
Horizon Hobby, Inc.
MD 520N® is a registered trademark or trademark of MD Helicopters Inc. and is used under license to
Horizon Hobby, Inc.
SEAHAWK and the Seahawk helicopter design are trademarks of Sikorsky Aircraft Corporation. They are licensed
throughout the world to Horizon Hobby, Inc.
Bell and Jet Ranger are either registered trademarks or trademarks of Textron Innovations Inc. in the USA and/or
other countries, used under license.
www.E-fliteRC.com
Revised 11/08 14475.1
Specifications
Length. . . . . . . . . . . . . . . . . . . . . . .
Height . . . . . . . . . . . . . . . . . . . . . . .
Main Rotor Diameter . . . . . . . . . . . . .
Weight RTF w/Battery . . . . . . . . . . . .
Main Motor. . . . . . . . . . . . . . . . . . . .
Battery. . . . . . . . . . . . . . . . . . . . . . .
Transmitter. . . . . . . . . . . . . . . . . . . .
On-Board Electronics. . . . . . . . . . . . .
Servos. . . . . . . . . . . . . . . . . . . . . . .
Receiver. . . . . . . . . . . . . . . . . . . . . .
16.4 in (415mm)
7.2 in (180mm)
13.6 in (345mm)
8.0 oz (227 g)
180 (2 installed)
2S 7.4V 800mAh Li-Po (included)
2.4GHz DSM2 5-channel (included)
3-in-1/mixer/ESC/heading lock gyro (installed)
S60 Super Sub-Micro (2 installed)
Spektrum™ 6100e (installed)
Introduction
Table of Contents
Specifications.............................................................................................................................................. 2
Introduction................................................................................................................................................. 4
Warning...................................................................................................................................................... 4
Note on Lithium Polymer Batteries................................................................................................................ 4
FCC Statement ........................................................................................................................................... 4
Instructions for Disposal of WEEE by Users in the European Union................................................................... 4
Additional Safety Precautions and Warnings................................................................................................... 5
Blade CX3 MD 520N RTF Contents............................................................................................................... 5
Additional Required Equipment...................................................................................................................... 6
Preparing for the First Flight Checklist........................................................................................................... 6
Flying Checklist........................................................................................................................................... 6
Battery Warnings and Guidelines................................................................................................................... 7
Battery Charging......................................................................................................................................... 9
Charge Errors and Indications..................................................................................................................... 12
Installing the Transmitter Batteries.............................................................................................................. 12
Installing the Flight Battery......................................................................................................................... 13
Center of Gravity....................................................................................................................................... 14
Transmitter Control Identification................................................................................................................. 15
Control Test.............................................................................................................................................. 16
3-in-1 Control Unit Description, Arming and Motor Control Test...................................................................... 22
Installing the Optional Training Gear............................................................................................................. 25
Understanding the Controls........................................................................................................................ 28
Choosing a Flying Area............................................................................................................................... 32
Flying the Blade CX3 MD 520N................................................................................................................... 32
Main Motor Proportional Mix Trimmer Pot Description and Adjustment........................................................... 34
Gyro Gain Trimmer Pot Description and Adjustment...................................................................................... 36
Upper Main Rotor Blade Tracking Adjustment............................................................................................... 37
Channel 5 Knob Description and Function.................................................................................................... 39
Transmitter and Receiver Binding and Fail-Safe............................................................................................ 40
Main Motor Care and Installing the Optional Main Motor Heat Sink................................................................. 42
2008 Official AMA National Model Aircraft Safety Code................................................................................. 43
Replacement Parts List.............................................................................................................................. 45
Optional Parts List..................................................................................................................................... 45
Replacement and Optional Parts ............................................................................................................... 46
Exploded View Parts Listing........................................................................................................................ 47
Exploded View........................................................................................................................................... 48
Warranty Period......................................................................................................................................... 49
Limited Warranty....................................................................................................................................... 49
Damage Limits.......................................................................................................................................... 49
Safety Precautions..................................................................................................................................... 49
Questions, Assistance, and Repairs............................................................................................................ 49
Inspection or Repairs................................................................................................................................. 50
Warranty Inspection and Repairs................................................................................................................. 50
Non-Warranty Repairs................................................................................................................................ 50
Product Registration.................................................................................................................................. 50
United States............................................................................................................................................ 51
United Kingdom......................................................................................................................................... 51
Germany................................................................................................................................................... 51
Declaration of Conformity........................................................................................................................... 52
The Blade® CX3 MD 520N® takes the beginner-friendly flight stability of the Blade CX2 and combines it with
Spektrum™ 2.4GHz DSM2™ technology that lets you fly anywhere, anytime without having to worry about
interference. The CX3 combines the stability and Spektrum DSM2 technology of the CX2 with a stunning new scale
body and ups the ante by including a heading lock gyro .
The Blade CX3 MD 520N is truly a Ready-for-Anyone-to-Fly micro class electric helicopter. Its coaxial counterrotating blades cancel out the rotational torque that makes hovering a conventional helicopter so difficult, while
providing unsurpassed stability in all other phases of flight. And whether you are a first-time or an experienced
helicopter pilot, you’ll enjoy many of the outstanding features that have the Blade CX3 MD 520N flying in no time.
Some of these features include: factory installed main motors, 3-in-1 control unit with mixer, ESCs and heading lock
gyro, and S60 Super Sub-Micro Servos. With the included 5-channel transmitter, 2-cell 800mAh Li-Po battery pack,
DC charger and AC adapter, you’ll have precise control for hovering, forward flight and more with flight times of up
to 10–15 minutes per charge.
While the Blade CX3 MD 520N is ready-to-fly right from the box, please take the time to read through this manual
completely for tips on battery safety and charging, control checks, flying and more. Please check out our website
at www.e-fliterc.com for helpful tips and more information about our products.
Warning
An RC helicopter is not a toy! If misused, it can cause serious bodily harm and damage to property. Fly only in open
areas, preferably at AMA (Academy of Model Aeronautics) approved flying sites, following all instructions. Keep
loose items that can get entangled in the rotor blades away for the main and tail blades, including loose clothing, or
other objects such as pencils and screwdrivers. Especially keep your hands away from the rotor blades.
Note on Lithium Polymer Batteries
Lithium Polymer batteries are significantly more volatile than alkaline or Ni-Cd/Ni-MH batteries used in RC
applications. All manufacturer’s instructions and warnings must be followed closely. Mishandling of Li-Po
batteries can result in fire. Always follow the manufacturer’s instructions when disposing of Lithium
Polymer batteries.
FCC Statement
This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This
device may not cause harmful interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
This product contains a radio transmitter with wireless technology which has been tested and found to be compliant
with the applicable regulations governing a radio transmitter in the 2.400 GHz to 2.4835 GHz frequency range.
The associated regulatory agencies of the following countries recognize the noted certifications for this product as
authorized for sale and use:
UK
DE
DK
NO
SE
FI
EE
LV
LT
PL
CZ
SK
HU
RO
SI
AT
IT
ES
PT
IE
NL
LU
MT
CY
GR
Instructions for Disposal of WEEE by Users in the European Union
This product must not be disposed of with other waste. Instead, it is the user’s responsibility to dispose
of their waste equipment by handing it over to a designated collection point for the recycling of waste
electrical and electronic equipment. The separate collection and recycling of your waste equipment at
the time of disposal will help to conserve natural resources and ensure that it is recycled in a manner that
protects human health and the environment. For more information about where you can drop off your waste
equipment for recycling, please contact your local city office, your household waste disposal service or
where you purchased the product.
3
4
Additional Safety Precautions and Warnings
As the user of this product, you are solely responsible for operating it in a manner that does not endanger yourself
and others or result in damage to the product or the property of others.
This model is controlled by a radio signal that is subject to interference from many sources outside your control.
This interference can cause momentary loss of control so it is advisable to always keep a safe distance in all
directions around your model, as this margin will help to avoid collisions or injury.
Additional Required Equipment
No additional equipment is required to complete your Blade CX3 MD 520N.
Preparing for the First Flight Checklist
• Never operate your model with low transmitter batteries.
Please note this checklist is not intended to be a replacement for the content included in this instruction manual.
Although it can be used as a quick start guide, we strongly suggest reading through this manual completely before
proceeding.
• Always operate your model in an open area away from cars, traffic, or people.
qRemove and inspect contents
• Avoid operating your model in the street where injury or damage can occur.
qCharge the flight battery
• Never operate the model out into the street or populated areas for any reason.
qInstall the 4 included AA batteries in the transmitter
• Carefully follow the directions and warnings for this and any optional support equipment (chargers, rechargeable
battery packs, etc.) that you use.
q
Install the flight battery in the helicopter (once it has been fully charged)
• Keep all chemicals, small parts and anything electrical out of the reach of children.
• Moisture causes damage to electronics. Avoid water exposure to all equipment not specifically designed and
protected for this purpose.
• Never lick or place any portion of your model in your mouth as it could cause serious injury or even death.
Blade CX3 MD 520N RTF Contents
Item
Not Available Separately
EFLH1055
EFLB0990
EFLC3110
EFLC4000
EFLH1209
EFLH1022
FUG4 (Optional)
EFLH2009 (Optional)
Description
Blade CX3 MD 520N RTF Airframe
LP5DSM 5-Channel Transmitter, DSM 2.4GHz
7.4V 800mAh 2-Cell Li-Po, JST/Balance
2-3 Cell Li-Po Balancing Charger, 0.65A
AC to 12VDC, 1.5-Amp Power Supply
Mounting Accessories & Screwdriver
Bind Plug
4 AA batteries
MD520N LED Navigation Light Upgrade Set
qCheck the Center of Gravity of the helicopter
qTest the controls
qInstall the optional Training Gear Set (EFLH1205; strongly recommended if this is your first helicopter model)
qFamiliarize yourself with the controls
qFind a suitable area for flying
Flying Checklist
Please note this checklist is not intended to be a replacement for the content included in this instruction manual.
Although it can be used as a quick start guide, we strongly suggest reading through this manual completely before
proceeding.
qAlways turn the transmitter on first
q
Plug the flight battery into the 3-in-1 control unit
qAllow the 3-in-1 control unit to arm properly
qFly the model
qLand the model
qUnplug the flight battery from the 3-in-1 control unit
qAlways turn the transmitter off last
5
6
Battery Warnings and Guidelines
While the 7.4V 800mAh 2-cell Lithium Polymer Battery Pack (EFLB0990) included with your
Blade CX3 MD 520N features Charge Protection Circuitry and Balance Charging via the included
2- to 3-Cell Lithium Polymer Balancing Charger (EFLC3110) to help ensure a safe charge every
time, you MUST read the following safety instructions and warnings before handling, charging or
using the Li-Po battery pack.
Note: Lithium Polymer batteries are significantly more volatile than the alkaline, Ni-Cd or
Ni-MH batteries used in RC applications. All instructions and warnings must be followed exactly.
Mishandling of Li-Po batteries can result in fire.
• If at any time during the charge or discharge process the battery begins to balloon or swell,
discontinue charging or discharging immediately. Quickly and safely disconnect the battery, then
place it in a safe, open area away from flammable materials to observe it for at least 15 minutes.
Continuing to charge or discharge a battery that has begun to balloon or swell can result in a fire. A
battery that has ballooned or swollen even a small amount must be removed from service completely.
• In the event of a crash, you must quickly and safely disconnect and remove the battery from the model, then
place it in a safe, open area away from flammable materials to observe it for at least 15 minutes.
• Store the battery at room temperature and approximately ½ charge (3.8V per cell; 7.6V for a 2-cell battery pack)
for best results.
By handling, charging or using the included Li-Po battery you assume all risks associated with lithium
batteries. If you do not agree with these conditions, return your complete Blade CX3 MD 520N model in
new, unused condition to the place of purchase immediately.
• When transporting or temporarily storing the battery, the temperature range should be from 40–120 degrees
Fahrenheit. Do not store the battery or model in a car or direct sunlight whenever possible. If stored in a hot car,
the battery can be damaged or even cause a fire.
• You must charge the included 7.4V 800mAh 2-cell Li-Po battery pack in a safe area away from flammable
materials.
• Do not over-discharge the battery. Discharging the battery too low can cause damage to the pack
resulting in reduced performance and duration.
• Do not charge the battery when installed in the helicopter.
Li-Po cells should not be discharged to below 3V each under load. In the case of the 2-Cell
Li-Po packs used for the Blade CX3 MD 520N, you will not want to allow the battery to fall
below 6V during flight.
• Never charge the battery unattended. When charging the battery you should always remain in constant
observation to monitor the charging process and react to potential problems that may occur.
• After flight, the battery must be cooled to ambient temperature before charging.
• You MUST use the included 2-3 Cell 7.4-11.1V Li-Po Balancing Charger ONLY. Failure to do so may
result in a fire causing personal injury and/or property damage. DO NOT use a Ni-Cd or Ni-MH charger.
The Blade CX3 MD 520N 3-in-1 control unit does not feature a voltage cutoff of any type, so we
suggest that you be extremely aware of the power level of the Li-Po battery pack during flight. If at
any time the helicopter begins to require more throttle than typical to maintain hover or flight, or
has lost significant power, you must land the helicopter and power the motors down IMMEDIATELY to
prevent over-discharge of the Li-Po battery pack. If you continue to run the motors after noticing a
loss in power, it is possible to discharge the Li-Po battery pack too far, causing permanent damage to
the pack.
Over-discharge of the Li-Po battery pack can result in shortened flight times, loss of power output or
failure of the pack entirely.
If you have any further questions or concerns regarding the handling, charging and/or use of the included Li-Po
battery pack, please contact the Horizon Support Team at 877-504-0233.
7
8
Battery Charging
Input power for the charger can also be supplied from a small 12V gel cell or car battery.
It is important that you only charge the included 7.4V 800mAh 2-cell Li-Po Battery Pack (EFLB0990)
with the included 2-3 Cell 7.4-11.1V Li-Po Balancing Charger (EFLC3110). Your battery pack is
equipped with special Charge Protection Circuitry and a Balance Charge Lead with connector that is
only compatible with this charger. Attempting to charge the pack using another Li-Po charger or a
charger that is not compatible with Li-Po batteries could result in serious damage. Please familiarize
yourself thoroughly with the warnings and guidelines (pages 7–8) before continuing.
The included 2-3 Cell 7.4-11.1V Li-Po Balancing Charger will charge a near fully discharged (not over-discharged)
7.4V 800mAh 2-cell Li-Po Battery Pack in approximately 1.2–1.5 hours. In some cases the charge time may be
shorter depending on the actual amount of capacity left in the pack after a flight. NEVER charge the battery
unattended.
Note: The Li-Po battery pack included with your Blade CX3 MD 520N will arrive partially charged. For this reason
the initial charge may only take approximately 30–50 minutes.
The charger requires up to 1.5-amps of 11.5- to 15-volt DC input power that can be supplied by the included AC to
12V DC, 1.5-Amp Power Supply (EFLC4000) for convenient charging anywhere an AC outlet is available.
NEVER attempt to power the charger from an AC outlet without the use of a proper AC to DC adapter/
power supply.
Note: When using the AC to DC adapter/power supply, the charger is protected to prevent damage if the alligator
clips touch. However, please take care to ensure that the alligator clips do not cause shorting of the battery,
adapter/power supply, etc. by keeping them clear.
The charger is equipped with two LED indicators marked RED and GREEN on the label. These LEDs indicate the
following (also found on the label of the charger):
• Red Flashing LED Only: Input power with no battery connected
• Red and Green Solid LED: Battery connected and charging
• Red Solid LED Only: Charge complete
• Red and Green Flashing LED: Charge error
9
10
Once you have connected the charger to a power source (use care to ensure proper polarity when connecting
the charger to the power source), its red LED will flash to indicate the charger has power and is ready to begin
charging. Connect the Li-Po battery pack to the charger using the specially marked Balance Charge Lead exiting
the battery pack and the connector labeled with 7.4V on the charger. The connector is keyed to prevent reverse
polarity connection.
Note: Do not force the connector on the Balance Charge Lead into the connector labeled 11.1V on the charger.
Doing so could result in damage to the battery pack and charger, and could result in a fire.
Charge Errors and Indications
In the event that both the red and green LEDs flash, a charge error has occurred. Some examples of
charge errors and their indications include:
• Alternating flashing of the red and green LEDs will indicate that the charge process has been interrupted. If input
power to the charger has been interrupted due to disconnection from the power source or a drop in voltage/
current output from the power source, unplug the battery from the charger. Next, check to make sure that the
input power plug from the AC to 12V DC adapter/power supply is connected or that the alligator clips are firmly
and properly attached to the power source. Also be sure that the power source is providing the proper amount of
voltage and current required to the charger.
After confirming the connections and that the power source is delivering the necessary voltage and current, restart the charge process by connecting the battery pack. Continue to monitor the charge process to ensure that
no further charge errors occur.
• Simultaneous flashing of the red and green LEDs will indicate that the voltage of the Li-Po battery pack is too low
to allow the charge process to begin. In this case the battery may have been over-discharged due to flying the
model too long (For more information on preventing over-discharge of the Li-Po battery pack, see the guidelines
section found on page 9), or that a single cell or even all cells in the battery pack may be damaged.
If after several charging attempts you continue to see this charge error indication, you should remove
the battery pack from service and replace it with a new one.
If you have any further questions or concerns regarding charge error indications, please contact the Horizon
Support Team at 877-504-0233.
Installing the Transmitter Batteries
Install the 4 included AA batteries in the transmitter. Check the power level of the batteries and operation of the
transmitter by switching the power switch on (upward). The LCD screen at the top of the transmitter will indicate the
power level of the batteries. If at any time the voltage indicated on the LCD screen falls to 4.0V or less, it will be
necessary to replace the batteries with new ones.
When the battery is properly connected and charging normally, the red and green LED indicators will glow solid.
Once the battery has been fully charged, the green LED will go out, leaving just the red LED glowing solid. The
battery can now be removed from the charger and installed into the Blade CX3 MD 520N for flight.
11
Note: Because the LP5DSM transmitter included with the Blade CX3 MD 520N is equipped with Spektrum 2.4GHz
DSM2 technology, it does not require the same input voltage or current consumption as a typical 72MHz transmitter
for proper operation and optimum performance.
12
Installing the Flight Battery
Use the included hook and loop material for mounting the Li-Po battery pack. The “hook” material is already installed
on the battery frame stop. The included “loop” material can be installed on the end of the battery without the wire
leads, depending on how you choose to install the battery and route the wire leads.
Center of Gravity
Once the battery has been properly installed and secured you will need to check the helicopter’s center of gravity. If
the helicopter is not properly balanced it can be difficult to control and constantly try to move forward or backward
in hover.
To check the center of gravity, lift the helicopter by the stabilizer flybar with the flybar positioned perpendicular to
the tail section of the body. Make sure that the helicopter balances level. If it does not, confirm that the battery has
been properly installed and reposition it forward or aft if necessary.
Support by Flybar
The battery can be installed through the opening on the bottom of the MD 520N body. Be sure to install the end of
the battery with the leads first, toward the front at an angle, then slide the battery toward the back until the “loop”
material on the battery securely fastens to the “hook” material on the battery frame stop.
Step 1
Step 3
Step 2
Step 4
13
Skids Must Be Level
14
Transmitter Control Identification
Control Test
Note: Each time before you fly you should ALWAYS turn the transmitter on before connecting the flight battery to
the unit. After each flight, be sure that you always disconnect the flight battery from the unit before powering the
transmitter off.
Although each Blade CX3 MD 520N model is test flown at the factory, it is a good idea to test the controls prior to
the first flight to ensure none of the servos, linkages or other parts were damaged during shipping and handling.
Before proceeding, ensure your throttle stick and trim are at the lowest possible position.
Turn the transmitter on first then plug the battery into the battery lead of the 3-in-1 unit.
Mode 2
Mode 2
Rudder/Throttle
Functions
Mode 1
Aileron/Elevator
Functions
Rudder Trim
Aileron Trim
Elevator Trim
Throttle Trim
Mode 1
Aileron/Throttle
Functions
Rudder/Elevator
Functions
Rudder Trim
Aileron Trim
Throttle Trim
Elevator Trim
15
16
Position the helicopter to view it from the FRONT
Move the elevator control stick on the transmitter forward and back to check elevator pitch control. When the stick
is pushed forward, the servo on the right side should push the swashplate upward.
Mode 2
When the stick is pulled back, the servo on the right should pull the swashplate downward.
Mode 2
Mode 1
Mode 1
17
18
Move the right-hand control stick on the transmitter left and right to check aileron roll control. When the stick is
pushed to the left, the servo on the left side should push the swashplate upward.
Mode 2
Mode 1
19
When the stick is pushed to the right, the servo on the left should pull the swashplate downward.
Mode 2
Mode 1
20
If at any time during the test the controls do not respond properly, double-check the servo reversing switches
located under the door on the bottom left front of the transmitter. Dip switches 1, 6 and 7 should be positioned as
shown to ensure proper servo reversing.
Note: All other dip switches should also be positioned as shown to ensure proper operation. DO NOT
attempt to fly your Blade CX3 with any of the dip switches set in positions that are not shown.
3-in-1 Control Unit Description, Arming and Motor Control Test
The unique 3-in-1 Control Unit installed on your Blade CX3 MD 520N is a lightweight combination of a main motor
mixer, main motor electronic speed controls, and a heading lock gyro. The 3-in-1 unit also contains a gyro gain
trimmer pot, main motor proportional mix trimmer pot and status LED.
Main Motor Porportional
Mix Trimmer Pot
Gain Trimmer Pot
Status LED
If the controls still do not respond properly after ensuring that the servo reversing dip switch positions are correct,
you may also check the servo connections on the receiver side of the 3-in-1 unit. These should be positioned as
follows (when viewing the helicopter from behind):
Motor Plugs
AIL Channel – Servo on the right side of the heli
ELE Channel – Servo on the left side of the heli
Once you have confirmed that the servo connection locations are correct, all controls should be functioning
properly. If you do encounter any problems with your Blade CX3 MD 520N responding properly to the transmitter,
do not fly. Contact the Horizon Support Team at 877-504-0233.
If you should ever need to access the 3-in-1 unit (usually only required if making adjustments to the gyro gain or
main motor proportional mix trimmer pots, as outlined on pages 34–35), you can do so by going through the front
window of the MD 520N scale body.
Note: It will not be necessary to access the 3-in-1 unit for proper arming and usual operation.
Note: The 3-in-1 unit has an optional remote gyro gain plug.
21
22
The following checklist contains the steps you must follow to ensure proper arming and operation of the 3-in-1 unit
as well as proper motor control response:
qEach time before you fly you must ALWAYS turn on the transmitter power first before connecting
the flight battery to the 3-in-1 unit. Never connect the flight battery to the 3-in-1 unit before first
powering on the transmitter.
Also, never turn off the transmitter before disconnecting the flight battery from the 3-in-1 unit first.
qBoth the throttle stick and throttle trim MUST be in their lowest possible position in order for the
3-in-1 unit to arm the electronic speed controls for the main motors.
If this is the first test flight, or a test flight following repairs, you will also want to center the rudder, aileron and
elevator trims (see photo found on page 15 for reference).
qAfter confirming that the direction of rotation for both rotor blades is correct, it is best to confirm that both rotor
blades respond properly to rudder control inputs. With both main rotor blades spinning at a low level of power,
move the rudder stick all the way to the right. This should cause the speed of the upper main rotor blade to
increase, and the speed of the lower main rotor blade to decrease. Next, move the rudder stick all the way to the
left. This should cause the speed of the lower main rotor blade to increase and the speed of the upper main rotor
blade to decrease. If both rotor blades are not responding properly to rudder input, simply reverse the locations
of their motor plugs on the 3-in-1 unit. Note that the proper motor plug locations are marked on the label of the
3-in-1 unit.
qAfter confirming both main rotor blades respond properly to rudder inputs, your Blade CX3 MD 520N is now
ready for flight. However, please be sure to review the following sections of the manual before proceeding with
the first flight.
qAfter confirming that the transmitter has been turned on and has an adequate level of battery power as displayed
by the LCD screen at the top of the transmitter, it is now safe to connect the flight battery to the 3-in-1 unit.
Note: Each time you power the transmitter on, it will enter “Bind Mode” (See pages 40-41 for
more information regarding “Bind Mode”) for a few seconds, as indicated by the red blinking LED
located under the door on the left bottom front of the transmitter. Once this LED becomes solid, the
transmitter is no longer in bind mode. We recommend waiting to connect the flight battery to the
3-in-1 unit after the transmitter has exited bind mode, otherwise the 3-in-1 may not arm properly or
as quickly.
• With battery power applied, the 3-in-1 unit status LED will blink red, and then blink green. It is
extremely important that you do not move or sway the helicopter once the status LED begins to blink
green confirming that the initialization process and calibration of the gyro has begun. It is OK to move
the model when the status LED is blinking red (as in the time it takes to connect the flight battery to the 3-in-1
unit and place the model at rest), as long as the model remains motionless when the status LED begins to blink
green.
• When the status LED becomes solid green, the unit is armed and ready for flight. Use caution as both
main motors will now run with throttle stick or throttle trim input. Do not advance the throttle stick or trim until
you are clear of the rotor blades and ready to fly.
Note: If the status LED does not become solid green, please review the following:
• If after blinking red the status LED becomes solid red, you have a positive Radio Frequency (RF) link between
the transmitter and receiver of the 3-in-1 unit, but the throttle stick and throttle trim may not be in their lowest
possible positions. Check to be sure that both the throttle stick and throttle trim are in their lowest possible
position and the status LED should blink green then become solid green indicating the unit is armed and ready for
flight. Proceed to the next step of the checklist once the unit is armed.
• If after blinking red the status LED turns off, you do not have a positive RF link between the transmitter and
receiver of the 3-in-1 unit. First, check to be sure that the transmitter has been powered on and has an adequate
level of battery power. If the transmitter was indeed powered on, power both the transmitter and 3-in-1 unit down,
then follow the steps to bind the 3-in-1 unit’s receiver to the transmitter (see pages 40–41 for more information).
Once you have confirmed that the transmitter and receiver are properly bound, the 3-in-1 unit should now arm
normally.
If your 3-in-1 unit will not arm after following the guidelines as listed above, contact the Horizon Support Team at
877-504-0233.
qOnce you have placed the helicopter in a safe area to test motor control, free from obstructions, and
are clear of the rotor blades, you can safely begin to power up the model.
qAdvance the throttle stick slowly, just until the main rotor blades begin to spin. Be sure not to advance the
throttle stick too far to keep the helicopter from lifting off the ground. Note the direction that each of the main
rotor blades spins. When viewed from the top, the lower main rotor blade should spin clockwise and the upper
main rotor blade should spin counterclockwise. If either rotor blade is operating in the wrong direction, unplug the
battery, then simply reverse its motor plug polarity on the 3-in-1 unit. Note that the proper polarity is marked on
the label of the 3-in-1 unit.
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Installing the Optional Training Gear
If the Blade CX3 MD 520N is your first helicopter model, we suggest that you install the optional
Training Gear Set (EFLH1205) before making your first flight. The training gear helps to further increase the stability
of the model while also providing added support and cushioning to prevent tip-overs and damage to the model from
abrupt landings.
• Once you have installed all four attachments, install the four screws making sure that they thread properly into
the back side of the attachment. It may be helpful to squeeze the attachment with a pair of pliers to make it
easier to thread the screw into the backside of the attachment. Do not tighten the screws all the way at this time,
as the attachments will need to be adjusted for proper alignment once the training gear rods are installed.
Installing the training gear takes only a few minutes following these steps:
• The Training Gear Set includes four training gear rods with plastic balls installed, four training gear rod to landing
skid attachments, four screws and one training gear rod mounting base.
• Locate the four training gear rods and rod mounting base. Note that the rod mounting base has four channels
into which the training gear rods will mount. The open side of these channels will face upward toward the bottom
of the helicopter when properly installed.
• Carefully pass each of the rods through the attachments on the landing skids and into the channels on the base.
Take care to not pull the landing skids out of their mounts in the battery supports.
• Locate the four training gear rod to landing skid attachments and four screws. Note that there are two each of
two types of attachments. Carefully snap two of the attachments onto the landing skids forward of the landing
skid struts. The side of the attachment with the large hole should face outward, away from the helicopter, and
forward to the front of the helicopter.
• Next, carefully snap the remaining two attachments onto the landing skids behind the landing skid struts. The
side of the attachment with the large hole should face outward, away from the helicopter, and backward to the
rear of the helicopter.
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• After ensuring that the rods are secure in the base, adjust the positions of the attachments on the landing skids
so that the base is centered under the main shaft of the helicopter. Once confirming the base is centered under
the main shaft, make sure that each of the landing skids is still firmly installed in the mounts of the battery
supports. Note that the landing skids may be pulled slightly inward under pressure of the training gear rods.
• With the attachments, rods and base properly positioned, you can now tighten the attachment screws until they
are just snug. Take care when tightening the screws to prevent stripping the backside of the attachments.
• Adjust the position of the tubing keepers and plastic balls on the training gear rods so that the balls are
positioned approximately 1/8” from the end of each rod. Be sure that the tubing keepers are positioned so that
the plastic ball can still spin freely on the rod.
Understanding the Controls
If you are not familiar with the controls of your Blade CX3 MD 520N, please take a few minutes to familiarize
yourself with them before attempting your first flight.
The throttle stick on the transmitter controls climb/descend. When the throttle stick and throttle trim lever are in
their lowest positions, the main rotor blades will not spin. Advancing the stick upward will increase the speed of the
main rotor blades. Increasing the speed of the main rotor blades will cause the model to climb.
Mode 2
Your Blade CX3 MD 520N is now ready for flight with the training gear installed.
Climb
Mode 1
Decreasing the speed of the main rotor blades by lowering the throttle stick will cause the model to descend.
Mode 2
Descend
Mode 1
After lifting the model off the ground you can balance the throttle by carefully moving the throttle stick up and down
so that the model will hold a stationary hover without climbing or descending.
You can also use the throttle trim to adjust the throttle value for a given stick position. For example,
raising the throttle trim will allow the model to hover at a lower throttle stick position. However, if you
do raise the throttle trim, you MUST remember to lower it (and the throttle stick) to the lowest possible
position IMMEDIATELY in the event of a crash or rotor blade strike.
Failure to lower the throttle trim (and throttle stick) to its lowest possible position immediately in the
event of a crash could result in damage to the main motor ESCs in the 3-in-1 unit, which may require
replacement of the 3-in-1 unit.
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Moving the rudder stick to the left will turn (yaw) the nose of the helicopter to the left about the axis of the main
shaft. This is accomplished by increasing the speed of the lower main rotor blade while decreasing the speed of the
upper main rotor blade.
Mode 2
The elevator stick controls both elevator fore and aft pitch. Pushing the stick forward will pitch the nose of the
helicopter downward, causing the helicopter to fly forward.
Mode 2
Nose Yaw Left
Helicopter Moves Forward
Mode 1
Mode 1
Moving the stick to the right will turn (yaw) the nose of the helicopter to the to the right about the axis of the main
shaft. This is accomplished by increasing the speed of the upper main rotor blade while decreasing the speed of
the lower main rotor blade.
Mode 2
Pulling the stick backward will pitch the tail of the helicopter downward, causing the helicopter to fly backward.
Mode 2
Helicopter Moves Backward
Nose Yaw Right
Mode 1
Mode 1
The rudder trim can be used to help keep the nose of the helicopter from rotating to the left or right when in hover
with no rudder stick input. For example, if the nose of the helicopter drifts to the right when in hover, add left rudder
trim until the nose stays as close to straight as possible. Also note that further adjustments to the rudder trim can
be made using the Main Motor Proportional Mix Trimmer Pot as outlined on page 34–35.
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The elevator trim can be used to help keep the helicopter from drifting forward or backward when in hover with no
elevator stick input. For example, if the helicopter drifts forward when in hover, pull the elevator trim downward until
the helicopter hovers as level as possible with no forward drifting.
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The aileron stick controls roll. Moving the stick left will roll the helicopter to the left, causing the helicopter to fly to
the left.
Mode 2
Helicopter Moves Left
Choosing a Flying Area
When you are ready for your first flight, you will want to select a large, open area that is free of people and
obstructions. We strongly recommend an indoor area with at least 20-feet by 20-feet of floor space and
no less than 8-foot ceilings.
If you have to make your first flight outdoors, you MUST pick a time when wind conditions are
COMPLETELY CALM. Due to the relatively small size and low weight of the Blade CX3 MD 520N, even the
slightest amount of wind can cause you to lose control, or the rotor blades to strike in the air, resulting in a crash.
Flying the Blade CX3 MD 520N
Having followed the proper 3-in-1 control unit arming procedure, confirmed proper control of the servos and motors,
and found a suitable flying area, your Blade CX3 MD 520N is ready for flight.
Mode 1
In addition to reviewing the flight maneuvers outlined below, we recommend that you watch the Instructional
Video online at www.E-fliteRC.com to see many of these maneuvers and adjustments performed by the
Blade CX3 MD 520N and pilot.
• Slowly raise the throttle stick, increasing the speed of the main rotor blades until the model begins to lift off.
Do not raise the throttle stick too quickly as the model could climb too fast causing you to lose control or make
contact with objects above.
Moving the stick to the right will roll the helicopter to the right, causing the helicopter to fly to the right.
Mode 2
Helicopter Moves Right
• Lift the model off the ground just a few inches and concentrate on balancing the throttle stick position so that the
model holds a steady hover altitude. In some cases it may be best to make a few short “hops” to an altitude of
just a few inches until you become familiar with the control inputs and trim settings required to maintain a steady
hover and altitude.
As you will find, the Blade CX3 MD 520N requires minor throttle adjustments to maintain its altitude in hover.
Remember to keep these throttle adjustments as minimal as possible as large adjustments could result in a loss
of control and/or a possible crash.
• While attempting to establish a low-level hover, you can also check to see if any trim adjustments are required to
help keep the Blade CX3 from constantly drifting in various directions. If you find the helicopter constantly drifts
without any directional control input, it will be best to land the model before making any adjustments to the trim
levers.
If the nose of the helicopter does not stay pointed in one direction, but is drifting to the left or right,
you will need to adjust the rudder trim. You can also adjust the Main Motor Proportional Mix if you experience
any difficulties in trimming nose drift with the rudder trim lever only. Please see pages 34–35 for more
information regarding Main Motor Proportional Mix Trimmer Pot adjustment.
Mode 1
If the helicopter is drifting forward or backward, you will need to adjust the elevator trim.
If the helicopter is drifting to the left or right, you will need to adjust the aileron trim.
The aileron trim can be used to help keep the helicopter from drifting left or right when in hover with no aileron stick
input. For example, if the helicopter drifts to the right when in hover, add left aileron trim until the helicopter hovers
as level as possible with no drifting to the right.
Once you have become familiar with the controls of the helicopter, you are almost ready to fly.
Continue to make trim adjustments until the helicopter can hover at a low altitude with very little drifting and
directional control input. If the Blade CX3 MD 520N is your first helicopter model, it may be best to have the help
of an experienced helicopter pilot to trim the model for you before making your first flight.
• Once you have the Blade CX3 MD 520N properly trimmed and maintaining a stable low-level hover, practice
using the rudder, elevator and aileron controls to get a feel for how the helicopter responds to control inputs.
Remember to keep the control inputs as minimal as possible to prevent over-controlling the helicopter, especially
when in hover.
• After becoming comfortable with hovering the Blade CX3 MD 520N at low-levels of altitude just a few inches off
the ground, you can transition to hovering and flying the helicopter at higher altitudes of approximately three to
four feet. At these higher altitudes you will be able to get a feel for the flight characteristics of the Blade CX3
when it is flying out of “ground effect.”
• If at any time during flight you feel like the helicopter is drifting out of control, simply release all of the controls
except for throttle. You will need to use the throttle to maintain altitude, but due to the inherent stability of the
coaxial counter-rotating blades, the Blade CX3 will simply return to a stable hover on its own if space allows.
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• Don’t be afraid to set the helicopter down on the ground quickly by lowering the throttle when approaching walls
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or other obstacles to help prevent main rotor blade strikes. Also, the optional Training Gear Set (EFLH1205) will
help to further prevent damage to the helicopter in the event that you must make an abrupt landing to avoid walls
or other obstacles.
• IN THE UNFORTUNATE EVENT OF A CRASH OR ROTOR BLADE STRIKE, NO MATTER
HOW MINOR OR MAJOR, YOU MUST LOWER BOTH THE THROTTLE STICK AND
THROTTLE TRIM TO THEIR LOWEST POSSIBLE POSITION AS QUICKLY AS POSSIBLE
TO PREVENT DAMAGE TO THE ESCS OF THE 3-IN-1 UNIT.
Main Motor Proportional Mix Trimmer Pot Description and Adjustment
The Main Motor Proportional Mix Trimmer Pot can be found on the left side of the 3-in-1 control unit. This
“proportional” trimmer pot adjusts the amount of mixing between the main motors allowing you to “fine-tune” the
rudder trim (sub-trim) to help prevent the nose from drifting to the left or right when in hover.
Main Motor
Proportional Mix
Trimmer Pot
Failure to lower both the throttle stick and throttle trim to their lowest possible positions in the event
of a crash could result in damage to the main motor ESCs in the 3-in-1 unit, which may require
replacement of the 3-in-1 unit.
Note: Crash damage is not covered under warranty.
• It is extremely important when hovering and flying the Blade CX3 MD 520N to be aware of the power
level of the Li-Po battery pack. If at any time the helicopter begins to require more throttle than
typical to maintain hover or flight, or has lost the ability to maintain hover or flight due to significant
loss of power, you must land the helicopter and power the motors down IMMEDIATELY to prevent
over-discharge of the Li-Po battery pack.
If you continue to run the motors after noticing a loss in power it is possible to discharge the Li-Po
battery pack too far, causing permanent damage to the pack. Over-discharge of the Li-Po battery
pack can result in shortened flight times, loss of power output or failure of the pack entirely.
• Once you have gained experience and confidence in hovering the Blade CX3 MD 520N, you can attempt more
advanced maneuvers including:
Forward Flight
• In a stable hover, with the rudder trim centered and no rudder control input, note the direction the nose of
the helicopter is drifting. If the nose of the helicopter is drifting to the left, you will want to increase power to
the right-hand motor (spinning the upper main rotor blade). This is accomplished by turning the “proportional”
trimmer pot clockwise (+).
Backward Flight
Pirouettes
Skidding Takeoffs
Skidding Landings
Spot Landings
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• If the nose of the helicopter is drifting to the right in hover, you will want to increase the power to the left-hand
motor (spinning the lower main rotor blade). This is accomplished by turning the “proportional” trimmer pot
counterclockwise (-).
Gyro Gain Trimmer Pot Description and Adjustment
The “gain” trimmer pot adjusts the gain setting value of the piezo gyro used to aid in keeping the tail of the
helicopter straight/on heading during flight.
Gain Trimmer Pot
Note: You must always power down the 3-in-1 unit before making adjustments to the proportional
mix trimmer pot. Any changes made to the trimmer pot will not take effect until the 3-in-1 unit is reinitialized and re-armed.
Also, you should always center the rudder trim lever on the transmitter after making adjustments to the proportional
mix trimmer pot on the 3-in-1 unit.
Note: Be sure to use the proper size and type of screwdriver to carefully make adjustments to the trimmer pot.
Use of the improper size and type of screwdriver or too much force can damage the trimmer pot. Also be sure
to take your time when making adjustments to the proportional trimmer pot as it may only require very slight
adjustment to achieve the desired level of performance (less than 1/8 of a turn).
• The gain value is set too high if the tail of the helicopter twitches/bounces quickly from side to side when in
hover. If this is case for your model, reduce the gyro gain in small increments until the tail of the helicopter no
longer twitches/bounces from side to side in hover.
Turn the gyro gain trimmer pot counterclockwise (-) to decrease gyro gain.
• The gain value is set too low when the tail of the helicopter feels “loose” during flight, requiring constant left and
right rudder inputs to maintain heading when in hover. If this is the case for your model, increase the gyro gain in
small increments until few, if any, left and right rudder inputs are required to maintain heading.
Turn the gyro gain trimmer pot clockwise (+) to increase gyro gain.
As the battery output voltage decreases throughout the flight, it may be necessary to make small adjustments to
the rudder trim or rudder control input in order to keep the nose of the helicopter straight. These small adjustments
can be made using the rudder trim lever or rudder control stick and do not require additional adjustments of the
proportional trimmer pot.
Note: When adjusting the gyro gain trimmer pot, the changes will take effect without the need to power
down and re-arm the 3-in-1 unit. Please exercise extreme caution when adjusting the gyro gain trimmer
pot with the model armed to prevent personal injury or damage to the model.
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Upper Main Rotor Blade Tracking Adjustment
Caution: Be sure to maintain a safe distance from the helicopter (approximately 10–15 feet) when
tracking the Upper Main Rotor Blade.
Tips Out Of Track—
Adjustment Necessary
Your Blade CX3 MD 520N is equipped with an adjustable linkage between the Stabilizer Flybar and Upper Main
Rotor Blade. This linkage allows you to adjust the tracking of the upper main rotor blade for smoother and more
stable flight performance.
Tips In Track—
No Adjustment Necessary
• You can check the upper main rotor blade tracking either on the ground or in the air at eye level. It might be a
good idea to have an assistant on hand to help sight the blade tracking.
• Once the main rotor blades have been brought up to speed, note whether the tips of the upper main rotor blade
are tracking in the same plane or not.
• If the tips are not tracking in the same plane, power the helicopter down to make adjustments to the adjustable
linkage. You can start by turning the ends of the linkage in one-half to one-full turn at a time. Power the helicopter
up again and re-check the blade tracking.
If the tracking has improved, continue to turn the ends of the linkage in one-half to one-full turn at a time until the
tips are tracking in the same plane.
If the tracking has become worse after first turning the ends of the adjustable linkage in, turn the ends of the
linkage back out one-half to one-full turn at a time. If the tracking then gets better, continue to turn the ends of
the linkage out one-half to one-full turn at a time until the tips are tracking in the same plane.
Typically, not much adjustment should be necessary to properly track the tips of the upper main rotor blade.
However, due to the small size of the linkage ends and threaded rods it may not always be possible to achieve
absolutely perfect blade tracking. Don’t worry as the helicopter will still perform well as long as the blade tracking is
adjusted as closely as possible.
Note: It will not be necessary to adjust the Lower Main Rotor Blade tracking as fixed links are used between the
rotor blade and swashplate.
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Channel 5 Knob Description and Function
The transmitter included with your Blade CX3 MD 520N is equipped with an optional-use “Channel 5” knob (labeled
as “CH 5”) on the top right panel.
This knob allows you to control function of the transmitter’s 5th channel. This channel remains un-used for flying
the Blade CX3 MD 520N, however, it is available for use in controlling a variety of potential optional features
including actuation of an additional servo or certain electronic components. It allows full proportional control of the
5th channel from approximately 0–100% travel.
Although no servo reversing is available for this channel, the knob can be operated in either direction for
control. You can use either the most clockwise (+) or most counterclockwise (-) position for 0 or 100% travel,
and you will achieve approximately 50% travel with the knob in the middle position, pointing directly to the rear of
the transmitter.
0% (or 100%) Travel
Transmitter and Receiver Binding and Fail-Safe
Binding is the process of programming the receiver to recognize the GUID (Globally Unique Identifier) code of a
single specific transmitter. If you ever find that it is necessary to replace your transmitter or the AR6100e in your
model, it will be necessary for you to “Bind” the new transmitter AR6100e receiver to your existing transmitter or
receiver for proper operation.
During the binding process, the smart fail-safe (SmartSafe™) positions of your system are also set. With SmartSafe,
in case of loss of signal, the throttle will go to the preset position that was stored during the binding process and
all other channels will hold their last position. And if the receiver (AR6100e) is powered on before the transmitter, all
channels but throttle will go to the fail-safe positions that were stored during the binding process, while the throttle
channel will not generate a pulse in order to prevent the ESC(s) from arming.
Note: Because the SmartSafe positions are set during the binding process, it is important to set all channels to the
preferred fail-safe positions before proceeding. In the case of the Blade CX3 MD 520N, we strongly recommend
setting the throttle stick and throttle trim to their lowest positions, and the rudder, aileron and elevator channels to
their neutral positions. Channel 5 should be set to your preferred position if you have chosen to utilize it.
The following steps outline the binding process:
• Each time the transmitter is turned on, it enters “Bind Mode” for a few seconds. You can tell that the transmitter
is in bind mode when you see the red LED located under the door on the bottom left front of the transmitter blink
rapidly. Once the LED becomes solid, the transmitter is no longer in bind mode and will transmit normally.
50% Travel
100% (or 0%) Travel
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• In order to bind the AR6100e receiver to the transmitter, you must first insert the Bind Plug (included with your
Blade CX3 MD 520N) into the “BAT” opening on the receiver. Then you will need to power on the receiver by
connecting the flight battery into the 3-in-1 control unit BEFORE powering the transmitter on.
Main Motor Care and Installing the Optional Main Motor Heat Sink
The 180 motors used to power your Blade CX3 MD 520N are of the closed end-bell variety and do not require any
special maintenance. We do, however, suggest that you allow the motors to cool to near ambient temperature
between flights/battery pack changes to prevent accelerated motor wear due to excess motor heat.
You will find the performance and life of the 180 main motors to be very good, however, installation of the optional
Main Motor Heat Sink (EFLH1208) can help to further improve motor cooling during flight, resulting in improved
motor performance and longer motor life.
Installing the main motor heat sink takes only a few minutes following these steps:
• Installation of the main motor heat sink will require that you to temporarily remove the right-hand main motor from
the main frame. This is easily accomplished by removing the two motor mounting screws found on the bottom of
the main frame.
• With the right-hand main motor removed from the frame, you can press the main motor heat sink into place near
the top/end of the left-hand main motor. We recommend that you use Heat Sink Compound (EFLM1913) on any
surfaces of the heat sink that make contact with the motor case to further improve the effectiveness of the heat
sink. The wider end of the heat sink (more fins) must be placed toward the front of the helicopter.
• You can now press the right-hand main motor into place in the heat sink and use the motor mounting screws to
re-install the motor on the main frame. Again, we recommend that you use Heat Sink Compound (EFLM1913) on
any surfaces of the heat sink that make contact with the motor case to further improve the effectiveness of the
heat sink.
The main motor heat sink is now installed and ready for flight.
• When you connect the flight battery to the 3-in-1 unit with the bind plug inserted into the “BAT” opening on the
receiver, you will see an orange LED blink rapidly on the receiver itself.
• Once the orange LED on the receiver begins to blink, turn on the transmitter. The transmitter will immediately
enter bind mode. Then, once the orange LED on the receiver and the red LED on the transmitter turn solid,
the receiver is bound to the transmitter. Now you will need to power down the 3-in-1 control unit, receiver and
transmitter, and remove the bind plug from the receiver.
Note: It is extremely important that you remove the bind plug from the receiver once it has been bound to the
transmitter. If you do not remove the bind plug the receiver will enter bind mode every time the 3-in-1 unit is
powered on.
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2008 Official AMA National Model Aircraft Safety Code
GENERAL
1. A
model aircraft shall be defined as a non-human-carrying device capable of sustained flight in the atmosphere. It shall not exceed limitations
established in this code and is intended to be used exclusively for recreational or competition activity.
2. T
he maximum takeoff weight of a model aircraft, including fuel, is 55 pounds, except for those flown under the AMA Experimental Aircraft Rules.
3. I will abide by this Safety Code and all rules established for the flying site I use. I will not willfully fly my model aircraft in a reckless and/or
dangerous manner.
4. I will not fly my model aircraft in sanctioned events, air shows, or model demonstrations until it has been proven airworthy.
FREE FLIGHT
1. I will not launch my model aircraft unless I am at least 100 feet downwind of spectators and automobile parking.
2. I will not fly my model aircraft unless the launch area is clear of all individuals except my mechanic, officials, and other fliers.
3. I will use an effective device to extinguish any fuse on the model aircraft after the fuse has completed its function.
CONTROL LINE
5. I will not fly my model aircraft higher than approximately 400 feet above ground level, when within three (3) miles of an airport without notifying
the airport operator. I will yield the right-of-way and avoid flying in the proximity of full-scale aircraft, utilizing a spotter when appropriate.
1. I will subject my complete control system (including the safety thong where applicable) to an inspection and pull test prior to flying. The pull test
will be in accordance with the current for the applicable model aircraft category. Model aircraft not fitting a specific category shall use those pull
test requirements as indicated for Control Line Precision Aerobatics.
6. I will not fly my model aircraft unless it is identified with my name and address, or AMA number, inside or affixed to the outside of the model
aircraft. This does not apply to model aircraft flown indoors.
2. I will ensure that my flying area is clear of all utility wires or poles and I will not fly a model aircraft closer than 50 feet to any above-ground
electric utility lines.
3. I will ensure that my flying area is clear of all nonessential participants and spectators before permitting my engine to be started.
7. I will not operate model aircraft with metal-blade propellers or with gaseous boosts (other than air), nor will I operate model aircraft with fuels
containing tetranitromethane or hydrazine.
8. I will not operate model aircraft carrying pyrotechnic devices which explode burn, or propel a projectile of any kind. Exceptions include Free
Flight fuses or devices that burn producing smoke and are securely attached to the model aircraft during flight. Rocket motors up to a G-series
size may be used, provided they remain firmly attached to the model aircraft during flight. Model rockets may be flown in accordance with the
National Model Rocketry Safety Code; however, they may not be launched from model aircraft. Officially designated AMAAir Show Teams (AST) are
authorized to use devices and practices as defined within the Air Show Advisory Committee Document.
9. I will not operate my model aircraft while under the influence of alcohol or within eight (8) hours of having consumed alcohol.
10. I will not operate my model aircraft while using any drug which could adversely affect my ability to safely control my model aircraft.
11. Children under six (6) years old are only allowed on a flightline or in a flight area as a pilot or while under flight instruction.
12. W
hen and where required by rule, helmets must be properly worn and fastened. They must be OSHA, DOT, ANSI, SNELL or NOCSAE approved
or comply with comparable standards.
PARK FLYER SAFE OPERATING RECOMMENDATIONS
- Inspect your model before every flight to make certain it is airworthy.
- Be aware of any other radio frequency user who may present an interference problem.
- Always be courteous and respectful of other users of your selected flight area.
- Choose an area clear of obstacles and large enough to safely accommodate your flying activity.
- Make certain this area is clear of friends and spectators prior to launching your aircraft.
- Be aware of other activities in the vicinity of your flight path that could cause potential conflict.
- Carefully plan your flight path prior to launch.
- Abide by any and all established AMA National Model Aircraft Safety Code.
RADIO CONTROL
1. All model flying shall be conducted in a manner to avoid flying or flight over unprotected people.
2. I will have completed a successful radio equipment ground-range check before the first flight of a new or repaired model aircraft.
3. I will not fly my model aircraft in the presence of spectators until I become a proficient flier, unless I am assisted by an experienced pilot.
4. A
t all flying sites a line must be established, in front of which all flying takes place. Only personnel associated with flying the model aircraft are
allowed at or in front of the line. In the case of air shows, a straight line for demonstrations must be established. An area away from the line must
be maintained for spectators. Intentional flying behind the line is prohibited.
5. I will operate my model aircraft using only radio-control frequencies currently allowed by the Federal Communications Commission (FCC). Only
individuals properly licensed by the FCC are authorized to operate equipment on Amateur Band frequencies.
6. I will not knowingly operate my model aircraft within three (3) miles of any preexisting flying site without a frequency-management agreement. A
frequency-management agreement may be an allocation of frequencies for each site, a day-use agreement between sites, or testing which
determines that no interference exists. A frequency-management agreement may exist between two or more AMA chartered clubs, AMA clubs and
individual AMA members, or individual AMA members. Frequency-management agreements, including an interference test report if the agreement
indicates no interference exists, will be signed by all parties and copies provided to AMA Headquarters.
7. W
ith the exception of events flown under official AMA rules, no powered model may be flown outdoors closer than 25 feet to any individual,
except for the pilot and located at the flightline.
8. U
nder no circumstances may a pilot or other person touch a model aircraft in flight while it is still under power, except to divert it from
striking an individual.
9. R
adio-controlled night flying is limited to low-performance model aircraft (less than 100 mph). The model aircraft must be equipped with a lighting
system which clearly defines the aircraft’s attitude and direction at all times.
10. T
he operator of a radio-controlled model aircraft shall control it during the entire flight, maintaining visual contact without enhancement other
than by corrective lenses that are prescribed for the pilot. No model aircraft shall be equipped with devices which allow it to be flown to a
selected location which is beyond the visual range of the pilot.
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Replacement Parts List
EFLH2000
EFLB0990
EFLC3110
EFLC4000
EFLH1022
EFLH2001
EFLH1055
EFLH1058
EFLRS60
EFLRS601
EFLRS602
EFLRSA100
EFLH1121
EFLH1209
EFLH1210B
EFLH1211B
EFLH1213
EFLH1214
EFLH1215
EFLH1216
EFLH1217
EFLH1218
EFLH1219
EFLH1220
EFLH1221
EFLH1225
EFLH1240
EFLH1243
EFLH1254
EFLH2002
EFLH2003
EFLH2004
EFLH2005
EFLH2006
EFLH2007
EFLH2008
EFLH2010
Blade CX3 MD 520N RTF Electric Coaxial Heli
7.4V 800mAh 2-Cell Li-Po, JST/Balance
2-3 Cell Li-Po Balancing Charger, 0.65A
AC to 12VDC, 1.5 Amp Power Supply
Bind Plug
3-in-1Control Unit, Mixer/Escs/Heading lock Gyro: BCX3
LP5DSM 5-Channel Transmitter, 2.4GHz DSM: BCX2/3
Transmitter Antenna, 2.4GHz: LP5DSM, HP6DSM
6.0 Gram Super Sub-Micro S60 Servo
Gear Set: S60
Case Set: S60
Standard Arm Set, Fine Spline: S60
Bearing 2x6x3mm (2): BCP, BCX2/3
Mounting Accessories & Screwdriver: BCX2/3
180 Motor w/8T 0.5M Pinion Left: BCX2/3
180 Motor w/8T 0.5M Pinion Right: BCX2/3
Outer Shaft & Main Gear Set: BCX2/3
Shaft Retaining Collar Set: BCX2/3
Bearing 4x6x3mm (2): BCX2/3
Swashplate Set: BCX2/3
Lower Rotor Head & Linkage Set: BCX2/3
Servo Pushrod Set: BCX2/3
Stabilizer Flybar Set: BCX2/3
Lower Main Blade Set (2 pair): BCX2/3
Upper Main Blade Set (2 pair): BCX2/3
Hardware Set: BCX2/3
Inner Shaft w/Aluminum Head/Hub: BCX2/3
Inner Shaft Main Gear: BCX2/3
Main Frame Set: BCX2/3
MD520N Replacement Body with Decal Sheet: BCX3
MD520N Landing Gear Set: BCX3
MD520N Battery Mount Set: BCX3
MD520N Body Mount Set: BCX3
MD520N Fin Set: BCX3
MD520N Hardware Set: BCX3
MD520N Complete Body Set: BCX2/3
MD520N Complete Decal Set:BCX3
Replacement and Optional Parts
7.4V 800mAh 2-Cell LiPo,
JST/Balance: BCX2/3
EFLB0990
LP5DSM 5-Channel Transmitter,
2.4GHz: BCX2/3
EFLH1055
AC to 12VDC 1.5 Amp
Power Supply
2-3 Cell Li-Po Balance
Charger, 0.5A: BCX2/3
Transmitter
Antenna,
2.4GHz:
BCX2/3
6.0 Gram Super
Sub-Micro S60
Servo
EFLC4000
EFLC3110
AR6100e
Receiver,
2.4GHz
EFLRS60
Main Motor Heat Sink: BCX2/3
SPMAR6100E
EFLH1055
EFLH1208
Bind Plug
Mounting
Accessories &
Screwdriver: BCX2/3
EFLH1022
EFLH1209
3n1CtrlUnt,Mixer/Escs/Headinglock
Gyro: BCX3
EFLH2001
180 Motor w/8T 0.5M
Pinion & PTC Fuse,
EFLH1210B
Left: BCX2/3
Outer Shaft & Main Gear
Set: BCX2/3
Shaft Retaining Collar Set: BCX2/3
180 Motor w/8T 0.5M
Pinion & PTC Fuse,
EFLH1211B
Right: BCX2/3
EFLH1213
Inner Shaft Main Gear: BCX2/3
Bearing 4x8x3 (2): BCX2/3
EFLH1215
EFLH1214
EFLH1243
EFLH1217
Lower Rotor Head and Linkage
Set: BCX2/3
Training Gear Set:
BCX2/3
Servo Pushrod Set:
BCP, BCX2/3
Stablizer Flybar Set: BCX2/3
Main Frame Set: BCX2/3
EFLH1254
Inner Shaft
with Aluminum
Head/Hub:
BCX2/3
MD520N Landing
Gear Set: BCX3
MD520N Battery
Mount Set: BCX3
EFLH1240
EFLH1219
Aluminum
Bearing Holder
with Bearing:
BCX2/3
Lower Main Blade Set (2 pair): BCX2/3
Upper Main Blade Set (2 pair): BCX2/3
EFLH1205
Aluminum
Lower Rotor
Head Set:
BCX2/3
EFLH1245
EFLH1244
EFLH1121
Swashplate Set: BCX2/3
EFLH1216
Optional Parts List
EFLH1205
EFLH1208
EFLH1232
EFLH1260
EFLH1263
EFLH1264
EFLH1270
EFLH1271
EFLM1913
EFLH1241
EFLH1244
EFLH1245
EFLH1246
EFLH2009
Training Gear Set: BCX2/3
Main Motor Heat Sink: BCX2/3
Complete Body Set, Police, Blue: BCX/2
Complete Body Set, Marines, with Decals, Gun and Missile: BCX/2
Jet Ranger Body Set, Blue/Red: BCX/2
Jet Ranger Body Set, Blue/Silver: BCX/2
SH-60 SEAHAWK Body Set, Black: BCX/2
SH-60 SEAHAWK Body Set, Gray: BCX/2
Heat Sink Compound, 5g
Inner Shaft for Aluminum Head/Hub: BCX2/3
Aluminum Bearing Holder w/Bearing: BCX2/3
Aluminum Lower Rotor Head Set: BCX2/3
Aluminum Swashplate Set: BCX2/3
LED Navigation Light Upgrade Set: BCX3
Please see your favorite retailer or visit our web site (www.E-fliteRC.com) to find the latest in new replacement and optional parts releases
for your Blade CX3 MD 520N.
45
Aluminum
Swashplate
Set: BCX2/3
EFLH2003
EFLH2004
MD520N
Hardware Set:
BCX3
EFLH2007
MD520N
body mount
set: BCX3
EFLH2004
MD520N Fin Set:
BCX3
EFLH2006
EFLH1259
MD520N Replacement Body: BCX3
LED Navigation
Light Upgrade
Set: BCX3
MD520N Complete Body Set: BCX2/3
EFLH2008
EFLH2009
46
EFLH2002
Exploded View Parts Listing
Exploded View
Reference
Number
Description (Quantity
Required)
001 Stabilizer Flybar Rubber Tip (2)
002 Stabilizer Flybar Weight (2)
003 Stabilizer Flybar (1) 004 Screw (2) M2x3mm 005 Stabilizer Flybar Link (1) 006 Stabilizer Flybar Linkage Rod (1) 007 Stabilizer Flybar Link (1) 008 1.2 x 6mm Screw (4) 009 Upper Main Blade (2) 010 M2 x 2.5mm Screw (5) 011 Lower Main Blade (2) 012 Upper Rotor Head Cap (1) 013 Upper Rotor Head (1) 014 Upper Rotor Head Set Screw (1) 015 Inner Shaft for Aluminum Head/Hub
016. Bearing 2mm x 6mm x 3mm (2)
017 Bearing Holder (1) 018 Lower Rotor Head (1) 019 Upper Swashplate (1) 020 Lower Rotor Head/Swash Linkage (2)
021 Servo Pushrod Control Link (2)
022 Servo Pushrod Control Pushrod (2)
023 Bearing 7mm x 13mm x 4mm (1)
024 Lower Swashplate (1) 025 Outer Shaft Retaining Collar (1) 026 Outer Shaft (1) 027 Main Motor Left (1) Main Motor Right (1) 028 Pinion Gear Left (1) Pinion Gear Right (1) 029 Main Frame (1) 030 AR6100e Receiver (1
Included In Item
Number
Exploded View
Reference
Number
Description (Quantity
Required)
Exploded View
Included In Item
Number
031 3in1CtrlUntMixer/ESC/Heading Lock Gyro
032 Bearing 4mm x 8mm x 3mm (2
033 1.7 x 4mm Screw (8) 034 Silicon Tube Section 035 Body Mount Rod 2x38mm (1) 036 Servo Mount (1) 037 Super Sub-Micro Servo (2) 038 1.7 x 4mm Screw (8) 039 Horizontal Fin Antenna (2) 040 Vertical Fin (1) 041 Horizontal Fin Screw (2) 042 Horizontal Fin (1) 043 Step Washer (1) 044 Outer Shaft Main Gear (1) 045 Inner Shaft Main Gear (1) 046 Inner Shaft Retaining Collar (1)
047 M2 x 4mm Screw (6) 048 MD520N Battery Support Rear (1)
049 MD520N Battery Support Front (1)
050 Battery Pack (1) 051 MD520N Replacement Body
052 MD520N Landing Gear Screws
053 MD520N Front Landing Gear (1) 054 MD520N Right Landing Skid (1)
055 MD520N Tail Cone (1)
056 MD520N Rear Landing Skid (1)
057 MD520N Exhaust Outlet/Nozzle 058 MD520N Rear Landing Gear (1)
059 Optional MD520N Navigation Light Set
060 MD520N Left Landing Skid (1)
061 MD520N Landing Skid Screw (4)
EFLH1219
EFLH1219
EFLH1219
EFLH1242
EFLH1219
EFLH1219
EFLH1219
EFLH2007
EFLH1221
EFLH2007
EFLH1220
EFLH1242
EFLH1242
EFLH1242
EFLH1241
EFLH1121
EFLH1217
EFLH1217
EFLH1216
EFLH1217
EFLH1218
EFLH1218
EFLH1216
EFLH1216
EFLH1214
EFLH1213
EFLH1210
EFLH1211
EFLH1210
EFLH1211
EFLH1254
SPMAR6100E
47
EFLH2001
EFLH1215
EFLH2007
EFLH1158
EFLH2005
EFLH1254
EFLRS60
EFLH2007
EFLH2006
EFLH2006
EFLH2007
EFLH2006
EFLH2007
EFLH1213
EFLH1212
EFLH1214
EFLH2007
EFLH2004
EFLH2004
EFLB0990
EFLH2002
EFLH2007
EFLH2003
EFLH2003
EFLH2002
EFLH2003
EFLH2002
EFLH2003
EFLH2009
EFLH2003
EFLH2007
48
Warranty Period
Horizon Hobby, Inc., (Horizon) warranties that the Products purchased (the “Product”) will be free from defects in
materials and workmanship at the date of purchase by the Purchaser.
Limited Warranty
(a) This warranty is limited to the original Purchaser (“Purchaser”) and is not transferable. REPAIR ORREPLACEMENT
AS PROVIDED UNDER THIS WARRANTY IS THE EXCLUSIVE REMEDY OF THE PURCHASER. This warranty covers
only those Products purchased from an
authorized Horizon dealer. Third party transactions are not covered by this warranty. Proof of purchase is required
for warranty claims. Further, Horizon reserves the right to change or modify this warranty without notice and
disclaims all other warranties, express or implied.
(b) Limitations- HORIZON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCT. THE
PURCHASER ACKNOWLEDGES THAT THEY ALONE HAVE DETERMINED THAT THE PRODUCT WILL SUITABLY MEET
THE REQUIREMENTS OF THE PURCHASER’S INTENDED USE.
(c) Purchaser Remedy- Horizon’s sole obligation hereunder shall be that Horizon will, at its option, (i) repair or (ii)
replace, any Product determined by Horizon to be defective. In the event of a defect, these are the Purchaser’s
exclusive remedies. Horizon reserves the right to inspect any and all equipment involved in a warranty claim. Repair
or replacement decisions are at the sole discretion of Horizon. This warranty does not cover cosmetic damage or
damage due to acts of God, accident, misuse, abuse, negligence, commercial use, or modification of or to any
part of the Product. This warranty does not cover damage due to improper installation, operation, maintenance, or
attempted repair by anyone other than Horizon. Return of any goods by Purchaser must be approved in writing by
Horizon before shipment.
Damage Limits
HORIZON SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR
PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCT, WHETHER SUCH CLAIM
IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT LIABILITY. Further, in no event shall the liability of
Horizon exceed the individual price of the Product on which liability is asserted. As Horizon has no control over use,
setup, final assembly, modification or misuse, no liability shall be assumed nor accepted for any resulting damage
or injury. By the act of use, setup or assembly, the user accepts all resulting liability. If you as the Purchaser or
user are not prepared to accept the liability associated with the use of this Product, you are advised to return this
Product immediately in new and unused condition to the place of purchase.
Inspection or Repairs
If this Product needs to be inspected or repaired, please call for a Return Merchandise Authorization (RMA).
Pack the Product securely using a shipping carton. Please note that original boxes may be included, but are not
designed to withstand the rigors of shipping without additional protection. Ship via a carrier that provides tracking
and insurance for lost or damaged parcels, as Horizon is not responsible for merchandise until it arrives and is
accepted at our facility. A Service Repair Request is available at www.horizonhobby.com on the “Support” tab. If
you do not have internet access, please include a letter with your complete name, street address, email address
and phone number where you can be reached during business days, your RMA number, a list of the included items,
method of payment for any non-warranty expenses and a brief summary of the problem. Your original sales receipt
must also be included for warranty consideration. Be sure your name, address, and RMA number are clearly written
on the outside of the shipping carton.
Warranty Inspection and Repairs
To receive warranty service, you must include your original sales receipt verifying the proof-of-purchase date.
Provided warranty conditions have been met, your Product will be repaired or replaced free of charge. Repair or
replacement decisions are at the sole discretion of Horizon Hobby.
Non-Warranty Repairs
Should your repair not be covered by warranty the repair will be completed and payment will be required without
notification or estimate of the expense unless the expense exceeds 50% of the retail purchase cost. By submitting
the item for repair you are agreeing to payment of the repair without notification. Repair estimates are available
upon request. You must include this request with your repair. Non-warranty repair estimates will be billed a
minimum of ½ hour of labor. In addition you will be billed for return freight. Please advise us of your preferred
method of payment. Horizon accepts money orders and cashiers checks, as well as Visa, MasterCard, American
Express, and Discover cards. If you choose to pay by credit card, please include your credit card number and
expiration date. Any repair left unpaid or unclaimed after 90 days will be considered abandoned and will be
disposed of accordingly. Please note: non-warranty repair is only available on electronics and model engines.
Product Registration
Please register your product at www.e-fliterc.com/register
Law: These Terms are governed by Illinois law (without regard to conflict of law principals).
Safety Precautions
This is a sophisticated hobby Product and not a toy. It must be operated with caution and common sense and
requires some basic mechanical ability. Failure to operate this Product in a safe and responsible manner could
result in injury or damage to the Product or other property. This Product is not intended for use by children without
direct adult supervision. The Product manual contains instructions for safety, operation and maintenance. It is
essential to read and follow all the instructions and warnings in the manual, prior to assembly, setup or use, in order
to operate correctly and avoid damage or injury.
Questions, Assistance, and Repairs
Your local hobby store and/or place of purchase cannot provide warranty support or repair. Once assembly, setup
or use of the Product has been started, you must contact Horizon directly. This will enable Horizon to better answer
your questions and service you in the event that you may need any assistance. For questions or assistance, please
direct your email to productsupport@horizonhobby.com, or call 877.504.0233 toll free to speak to a service
technician.
49
50
Declaration of Conformity
United States
(in accordance with ISO/IEC 17050-1)
Electronics and engines requiring inspection or repair should be shipped to the following address:
Horizon Service Center
4105 Fieldstone Road
Champaign, Illinois 61822
All other products requiring warranty inspection or repair should be shipped to the following address:
Horizon Support Team
4105 Fieldstone Road
Champaign, Illinois 61822
Please call 877.504.0233 or e-mail us at productsupport@horizonhobby.com with any questions or concerns
regarding this product or warranty.
United Kingdom
Electronics and engines requiring inspection or repair should be shipped to the following address:
Horizon Hobby UK
Units 1-4 Ployters Rd
Staple Tye
Harlow, Essex
CM18 7NS
United Kingdom
No. HH20081014
Products: Item Numbers: E-flite Blade CX3 RTF and BNF
EFLH2000, EFLH2080
Equipment Class: 1
The objects of declaration described above are in conformity with the requirements of the specifications listed
below, following the provisions of the European R&TTE directive 1999/5/EC:
EN 300-328 v1.7.1ERM requirements for wideband transmission systems operating in
the 2.4GHz ISM band
EN 301 489-1 v.1.6.1
General EMC requirements for Radio equipment
EN 301 489-17 v.1.2.1
Signed for and on behalf of:
Horizon Hobby, Inc.
Champaign, IL USA
10/14/2008
Please call +44 (0) 1279 641 097 or e-mail us at sales@horizonhobby.co.uk with any questions or concerns
regarding this product or warranty.
Steven A. Hall
Vice President
International Operations and Risk Management
Horizon Hobby, Inc.
Germany
Electronics and engines requiring inspection or repair should be shipped to the following address:
Horizon Technischer Service
Hamburger Strasse 10
25335 Elmshorn
Germany
Please call +49 4121 46199 66 or email us at service@horizonhobby.de with any questions or concerns regarding
this product or warranty.
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52
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