Model Technology Mini Mach Racer Specifications

The Model Tech Apex 3D EP ARF is designed for one thing: Electric Flying Fun! A cross between a stick and a 3D airplane, the Apex
3D EP ARF is light, nimble, responsive, and solid. No matter how wild the maneuver, just release input and watch it straighten up,
making recovery easy. The light wing loading provides that quick response and allows for great low-speed handling. Soloed pilots
to wold champions can set this airplane up for anything from Mild-to-Wild.
The APEX is a great time. It's the Peak of Fun, the APEX by Model Tech.
Check out our website for more information on this and other exciting Model Tech products!
HTTP://MODELTECH.GLOBALHOBBY.COM
ASSEMBLY INSTRUCTIONS
The Model Tech Apex 3D EP ARF is distributed
exclusively in North America by Global Hobby Distributors
and in the U.K. by YT International
features
All Contents Copyright © 2006, Global Hobby Distributors
Version 1 December 2006
●
Precision-Built, All-Wood Structure
●
Ultra-Lightweight Wing Loading and Over-Sized Control Surfaces
●
Motor Installation Allows for Easy Mounting of Different Motor Types
●
Premium, Factory-Applied Covering with Four-Color Decal Sheet
●
Dual Aileron Servos for Precise Control and Mixing Capabilities
●
Includes High-Quality Hardware
●
Fast and Easy Assembly - Over 60 High-Resolution Digital Photos and Drawings
specifications
Wing Span: 43.375 Inches (1102mm)
●
Wing Area: 600 Square Inches (38.7dm2)
Weight RTF: 2.1-2.4 Pounds (34-38oz)
●
●
Length: 43.5 Inches (1105mm)
Wing Loading: 8.17-9.14 Ounces/Square Foot (28-32gr/dm2)
Functions: Ailerons, Elevator, Rudder and Throttle
Motor Required: 200-400 Watt Power System
Made in China
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ESC Required: 40 Amp Brushless
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Battery Required: 3 Cell 2100mAH LiPO
Kit Product Number 128508
TABLE OF CONTENTS
INTRODUCTION......................................................................................2
STABILIZER INSTALLATION...................................................................9
SAFETY WARNING.................................................................................2
ELEVATOR AND RUDDER CONTROL SYSTEMS INSTALLATION......... 12
OUR GUARANTEE..................................................................................2
AILERON CONTROL SYSTEMS INSTALLATION................................. 15
CUSTOMER SERVICE INFORMATION.................................................. 3
LANDING GEAR INSTALLATION.......................................................... 16
OUR RECOMMENDATIONS................................................................... 3
FINAL ASSEMBLY..................................................................................18
LITHIUM POLYMER BATTERY WARNINGS - PLEASE READ............... 4
BALANCE POINT AND CONTROL THROWS....................................... 19
TOOLS AND SUPPLIES REQUIRED...................................................... 5
PREFLIGHT CHECK AND SAFETY...................................................... 20
KIT CONTENTS.......................................................................................5
REPLACEMENT PARTS LIST............................................................... 20
A NOTE ABOUT COVERING MATERIAL................................................ 6
PRODUCT EVALUATION SHEET.......................................................... 23
TIPS FROM THE PROS...........................................................................6
MOTOR INSTALLATION..........................................................................7
WING INSTALLATION..............................................................................8
INTRODUCTION
Thank you for purchasing the Model Tech Apex 3D EP ARF. We're confident that the quality of your new airplane meets and
even exceeds your expectations. Before completing the final assembly of your new airplane, please carefully read through
these assembly instructions in their entirety. Doing so will ensure your success the first time around!
These assembly instructions are designed to guide you through the entire assembly process of your new airplane in the least amount
of time possible. Along the way you'll learn how to properly assemble your new airplane and also learn tips that will help you in the
future. We have listed some of our recommendations below. Please read through them before beginning assembly.
Please read through each step before beginning assembly. You ● Keep a couple of small bowls or jars handy to put the small parts
should find the layout very complete and straightforward. Our goal in after you open the accessory bags.
is to guide you through assembly without any of the headaches ● We're all excited to get a new airplane in the air, but take your
and hassles that you might expect.
time. This will ensure you build a straight, strong and great flying
● There are check boxes next to each procedure.
After you airplane.
complete a procedure, check off the box. This will help prevent ● If you come across this symbol
, it means that this is an
you from losing your place.
important point or an assembly hint.
●
☞
Cover your work table with brown paper or a soft cloth, both to
protect the table and to protect the parts.
●
SAFETY WARNING
This R/C airplane is not a toy! If misused or abused, it can cause serious bodily injury and/or damage to property. Fly only in open
areas and preferably at a dedicated R/C flying site. We suggest having a qualified instructor carefully inspect your airplane before
its first flight. Please carefully read and follow all instructions included with this airplane, your radio control system and any other
components purchased separately.
OUR GUARANTEE
Model Tech guarantees this kit to be free from defects in both material and workmanship at the date of purchase. This does not cover any component
parts damaged by use, misuse or modification. In no case shall Model Tech's liability exceed the original cost of the purchased kit.
In that Model Tech has no control over the final assembly or material used for final assembly, no liability shall be assumed for any damage resulting
from the use by the user of the final user-assembled product. By the act of using the final user-assembled product, the user accepts all
resulting liability.
Page CUSTOMER SERVICE INFORMATION
In the USA
In the UK
Global Services
18480 Bandilier Circle
Fountain Valley, CA 92708
Phone: (714) 963-0329 Fax: (714) 964-6236
Email: service@globalhobby.net
YT International
15 Parkstone Close
Shelfield, Walsall, West Midlands WS4 1QW
Phone/Fax: 01922-684425
Email: enquiries@ytinternational.co.uk
Check out our support website at http://globalservices.globalhobby.com. There you will find public message boards frequented by other Model Tech
product owners and the Model Tech technical support staff. This is a great place to get quick answers and advice on your new product.
To enable us to better serve your needs, please include your email address with any correspondence you send to us. Your email address will be added
to our Customer Service Database so you will automatically receive free updates and tech notices for your particular product. You will also receive
repair status updates (if applicable) and other important information about your product as it becomes available.
IMPORTANT INFORMATION ABOUT YOUR EMAIL ADDRESS
Global Hobby Distributors will not disclose the information it collects to outside parties. We do not sell, trade, or rent your personal information to others . Your privacy is important to us.
OUR RECOMMENDATIONS
This section describes our recommendations to help you in deciding which types of accessories to purchase for your new airplane.
Please read through this entire section very carefully. We have provided you with recommendations that,
if followed, will result in a great flying airplane. Failure to follow our recommendations may result in a poor
flying airplane.
Recommended brushless power system
All prototype testing on the Apex 3D EP ARF was done using the Multiplex BL480/4G 480 Brushless Motor with Gearbox. We used
the 4.4:1 gearbox, APC 10 x 7E propeller, KMS Sentry 40 amp brushless ESC, and Impulse Power 3C 2100mAH LiPO battery. The
Apex 3D EP ARF, however, is set up so that both in-line gearbox and Outrunner direct drive motors can easily be used. These motors
include the Hacker A30 series, AXI 2814 and 2217, and KMS 2814 Outrunner motor
● Multiplex BL480/4G Brushless Motor
KMS Sentry 40 Amp Brushless ESC
●
APC 10 x 7E Composite Propeller
●
Impulse Power 3C 2100mAH LiPO Battery
●
Pro-Peak Quattro LiPO DC Charger
●
Maxx Products 1/8" Propeller Adapter
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Recommended Radio, Receiver and Servos
You will need to use a 4 or more channel transmitter with a 4 or more channel
standard range mini receiver. Ideally, the transmitter should feature dual rates and
servo reversing. More experienced pilots might also want exponential and mixing
capabilities. Do not use short-range micro receivers.
The servos you use should be the lightest available, yet still have an adequate
amount of torque. We suggest using mini servos that weigh no more than 18 grams
and have a torque rating of no less than 25 ounces per square inch. The Cirrus CS402BB 18gr mini servos will work well. These
servos are lightweight, small and strong, and produce more than enough torque and speed.
Here's a List of What We used to finish the Apex 3D EP arf shown in these instructions
QTY. 1
Hitec Optic 6 FM Radio System
QTY. 1
Impulse Power 3C 2100mAH LiPO Battery
QTY. 1
Multiplex BL480/4G Brushless Motor
QTY. 1
Maxx Products 1/8" Propeller Adapter
QTY. 1
KMS Sentry 40 Amp Brushless ESC
QTY. 2
Cirrus 12" Servo Extension Leads
QTY. 1
APC 10 x 7E Composite Propeller
QTY. 1
Pro-Peak Quattro LiPO Charger
QTY. 1
Hitec Electron 6 FM Receiver
QTY. 1
X'TRA 4mm Gold Connector Set
QTY. 1
Hitec Crystal for FM Dual Conversion Receivers
QTY. 1
Double-Sided Foam Tape
QTY. 4
Cirrus CS402BB 18gr Mini Servos
QTY. 1
#64 Rubber Bands
Page LITHIUM POLYMER BATTERY WARNINGS - PLEASE READ
WARNINGS AND SAFETY PRECAUTIONS FOR ALL BRANDS OF LITHIUM POLYMER BATTERIES
Please read and understand the warnings listed in this section. Make sure to read any and all warnings
included in the packaging with your battery, too. If used improperly, lithium polymer batteries can be very
dangerous, so please follow these warnings and suggestions at all times.
This product may explode or catch fire. Serious injury can result from misuse. Serious injury, loss of property, fire and death can result from misuse of this product.
●All instructions, warnings and cautions must be followed at all times. Failure to do so can lead to serious injury or fire.
●Do NOT use this product before reading and understanding all directions and warnings.
●
Do NOT overcharge. Maximum voltage for each pack must be followed.
●Do NOT over-discharge. NEVER discharge below minimum volts.
●
Do NOT discharge at a rate greater than the maximum continuous discharge.
●Do NOT use or charge if the battery is hot.
●ONLY use a charger made for Lithium Polymer batteries.
●Do NOT charge at a rate higher than 1C. Example: if the battery’s rating is 340mAH, then the charger’s charge rate must be set at 340mAH or less.
●Do NOT leave in direct sunlight or in a hot car or storage area.
●Do NOT get wet or expose to moisture.
●Do NOT short-circuit the battery.
●ONLY discharge and charge the battery outdoors or in a firesafe container.
●Do NOT charge with reverse polarity.
●Do NOT leave the battery connected when not in use.
●Do NOT operate or charge unattended.
●Do NOT solder to the battery directly and do not get the battery hot in any way.
●
CHARGING PRECAUTIONS FOR ALL BRANDS OF LITHIUM POLYMER BATTERIES
Do NOT use the product if you do not understand the warnings and proper use of the product. ●
Always let the battery cool and "rest" between uses and charging.
●To avoid over-discharging, only use a speed control that is made for LiPO batteries.
●We recommend the use of a firesafe container when charging or storing.
●Do NOT charge inside your car or inside your house.
● Inspect the battery before each use for swelling or other malformation. If the cell has ballooned, it MUST be discarded.
●Set the charger to 1C (charge at 1/2C or less for the first 5 cycles).
●Check polarity and then connect battery to charger.
●In use, do not over-discharge or exceed maximum discharge.
●When handling the battery, remember not to poke, bend or damage the cell. The cell outer casing is soft and can be damaged.
●Remember, the cells must never exceed 160 degrees Fahrenheit for any reason.
●
Page TOOLS AND SUPPLIES REQUIRED
❑ 5 Minute Epoxy
❑ T-Pins
❑ Thin and Thick C/A
❑ Builder's Triangle
❑ # 1 and # 2 Phillips Head Screwdrivers
❑ 220 Grit Sandpaper with Sanding Block
❑ 1.5mm Hex Wrench (Optional)
❑ Masking Tape
❑ Adjustable Wrench
❑ Paper Towels
❑ Wire Cutters
❑ Rubbing Alcohol
❑ Needle Nose Pliers
❑ Epoxy Mixing Sticks
❑ Modeling Knife
❑ Epoxy Mixing Cups
❑ Scissors
❑ Soldering Iron
❑ Electric or Hand Drill
❑ Solder
❑ Assorted Drill Bits
❑ Heat-Shrink Tubing (Assorted Sizes)
❑ Straight Edge Ruler
❑ Heat Gun (for Heat-Shrink Tubing)
❑ Pencil
KIT CONTENTS
Before you begin assembly, group the parts as we list them below. This will ensure that you have all of the parts before you begin
assembly and it will also help you become familiar with each part.
If you find any parts missing or damaged, please contact your local distributor,
using the Customer Service Information on page 2.
AIRFRAME ASSEMBLIES
❑ (1) Fuselage
❑ (1) Wing with Ailerons
❑ (1) Horizontal Stabilizer with Elevator
❑ (1) Vertical Stabilizer with Rudder
LANDING GEAR ASSEMBLY
❑ (2) Landing Gear Wires
q (1) Tail Skid
❑ (2) Wheels
❑ (2) Nylon Landing Gear Straps
q (2) Nylon Axle Spacers
q (2) Wheel Collars
q (2) M3 x 5mm Machine Screws
q (4) M2 x 10mm Wood Screws
CONTROL SYSTEM ASSEMBLIES
❑ (1) 5-1/2" (140mm) Threaded Wire with Z-Bend
❑ (1) 4-1/8" (105mm) Threaded Wire with Z-Bend
❑ (2) 2-3/4" (70mm) Threaded Wires with Z-Bends
❑ (4) Nylon Control Horns with Backplates
q (4) Nylon Clevises
q (8) M2 x 10mm Machine Screws
Page MOTOR MOUNT ASSEMBLY
❑ (2) Motor Mount Straps - Tall
❑ (2) Motor Mounts Straps - Short
❑ (4) M3 x 12mm Wood Screws
MISCELLANEOUS PARTS
❑ (2) Wing Hold-Down Dowels
❑ (1) Wing Hold-Down Doubler
❑ (1) Hook and Loop Material
q (1) Decal Set (Not Pictured)
A NOTE ABOUT COVERING MATERIAL
The covering material used on your airplane is real iron-on, heat-shrink covering material. It is possible with heat and humidity changes
that the covering material on your airplane may wrinkle or sag. This trait is inherent in all types of heat-shrink material. To remove
any wrinkles that might be visible you will need to use a heat-sealing covering iron.
Follow this simple procedure to remove the wrinkles:
❑ Plug in and turn on the sealing iron to the medium-high temperature setting. Allow the sealing iron to heat up for approximately
5 - 7 minutes.
❑ After the sealing iron has reached temperature, lightly apply the sealing iron to the wrinkled section of the covering material. Move
the sealing iron slowly over the wrinkled section until the covering material tightens and the wrinkles disappear.
IMPORTANT You will notice that the color of the covering material will darken when it is heated. When the covering material
cools back down, it will return to its normal color.
☞If the color layer smears from any of the seams the temperature of the sealing iron is too hot.
Turn the temperature dial down
and wait about 5 minutes for the sealing iron to adjust to the lower temperature. You can remove any excess color streaks using a
paper towel soaked with a small quantity of acetone.
TIPS FROM THE PROS
During the covering process, sometimes color may smear slightly from the seams. If you see any smeared colors on the covering
material, they can be quickly removed by simply wiping them off with a paper towel and a small amount of acetone.
●
Make sure to test-fit the parts together before applying glue. This will ensure that the parts fit properly before gluing them together.
●
When gluing anything that has a smooth surface, it's important to lightly roughen the gluing surfaces with 220 grit sandpaper. This
will allow the glue to stick better. Also, never glue directly to the covering material. Always remove the covering material from the
gluing surfaces prior to gluing the parts together.
●
When cutting away the covering material from the gluing surfaces, be careful to cut only through the covering material. Try not to
cut down into the balsa structure because that can compromise the integrity of the airframe.
●
We do not suggest storing your airplane in an extremely hot environment (like the back of your car in direct sunlight) for any length
of time. The extreme heat could cause the covering material to wrinkle or sag and possibly damage the fragile components of the
radio control system and/or battery.
●
Epoxy can be cleaned up before it dries using rubbing alcohol, and C/A can be cleaned up before it dries using C/A Debonder.
●
To prevent current loss, make sure to use high-quality connectors between the battery and the ESC and solder your ESC motor
wires directly to the motor.
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Insulate solder joints with heat-shrink tubing to prevent short circuits and corrosion.
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Read and fully understand the LiPO battery warnings on page 4.
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Page MOTOR INSTALLATION
You'll Need the following parts FROM THE KIT:
❑ (1) Fuselage
❑ (2) Motor Mount Straps - Short
q (2) Motor Mount Straps - Tall
q (4) M3 x 12mm Wood Screws
You'll Need the following TOOLS AND SUPPLIES:
❑ # 2 Phillips Head Screwdriver
q 5/64” (2mm) Drill Bit
q 1.5mm Hex Wrench (Optional)
❑ Straight Edge Ruler
❑ Modeling Knife
❑ Pencil
q Electric or Hand Drill
IMPORTANT This section shows the installation of two different types of motors. The first type shown (in Step 1A) is a brushless
motor with an in-line gearbox. The second type shown (in Step 1B) is a brushless Outrunner direct drive motor. If you're mounting
an Outrunner motor you will need to use mounting screws and washers that match your motor (mounting screws and washers are
not included). Please skip to the step that matches the type of motor that you're going to use.
Step 1A: INSTALLING the motor - Brushless with in-line gearbox
❑ Cut away enough of the plywood motor plate to ensure that your propeller
adapter will not hit it when it's installed later.
❑ Set the two taller motor mounting straps onto the plywood rails. Position
the motor mounting straps in the approximate positions shown.
❑ Set your motor onto the motor mounting straps and push it forward so that
the front of the gearbox is just about touching the plywood motor plate. In this
position, when you install your propeller adapter, the front edge of the propeller
adapter will be about 1/4" (6mm) in front of the front of the fuselage.
q While gently holding the motor in position, adjust the placement of the two
motor mounting straps so they are centered, but not covering any of the motor’s
cooling slots.
❑ When satisfied with the alignment, mark the locations of the four motor
mounting screws, then drill four 5/64" (2mm) diameter pilot holes through the
mounting rails.
IMPORTANT Be careful not to drill through the top of the fuselage.
Page ❑ Set the motor mounting straps and your motor back into place and realign
them.
❑ Place the remaining two motor mounting straps over the motor and secure
the assembly into place, using four M3 x 12mm wood screws.
☞Tighten the wood screws firmly, yet evenly, to clamp the motor securely
in place.
Step 1B: INSTALLING the motor - Brushless outrunner direct drive
IMPORTANT The precut slots in the plywood motor plate are 4mm wide. If your motor uses 3mm diameter mounting screws,
you will need to use "oversized" washers to ensure that you can tighten the mounting screws securely. For some motors, it may be
necessary to enlarge the center cutout in the plywood motor plate. Some motors may also include a separate plywood plate that
can be used as a drilling guide. If drilling new holes through the plywood motor plate, make sure to drill the new holes off-center
from the precut slots to ensure adequate strength.
❑ Line up the mounting holes in your motor with the precut slots in the
plywood motor plate.
q Secure your motor into place, using the machine screws and washers
included with your motor.
WING INSTALLATION
You'll Need the following parts FROM THE KIT:
❑ (1) Wing Hold-Down Doubler
❑ (1) Wing with Ailerons
q (2) Wing Hold-Down Dowels
You'll Need the following TOOLS AND SUPPLIES:
❑ 5 Minute Epoxy
q Paper Towels
q Thick C/A
q Rubbing Alcohol
❑ Modeling Knife
q Epoxy Mixing Sticks
❑ Straight Edge Ruler
q Epoxy Mixing Cups
❑ Pencil
Step 1: INSTALLING the WING HOLD-DOWN DOUBLER
❑ Place the wing hold-down doubler on top of the wing. Align the back
edge of the doubler with the trailing edge of the wing, and align the edges of
the purple covering material on the wing hold-down doubler with the edges
of the purple covering material on the wing.
q When satisfied with the alignment, draw an outline around the wing
hold‑down doubler on the wing.
Page ❑ Cut away the covering material from within the outline you drew, then glue
the wing hold-down doubler into place.
IMPORTANT Glue does not stick well to covering material. To ensure the strongest bond, always make sure to remove the covering
material from the gluing surfaces before gluing the parts together.
Step 2: installing the WING HOLD-DOWN dowels
❑ Cut away the covering material from over the two wing hold-down dowel
mounting holes in each side of the fuselage. Two holes are located 2-1/4" (57mm)
up from the bottom of the fuselage and 1/2" (13mm) in front of the wing saddle,
and two holes are located 2-1/8" (54mm) up from the bottom of the fuselage
and 3/4" (19mm) behind the wing saddle.
❑ Glue one wing hold-down dowel into the two holes at the front of the wing
saddle, making sure that the dowel is centered from side to side.
❑ Glue the second wing hold-down dowel into the two holes at the back of
the wing saddle, again making sure that the dowel is centered from side
to side.
Step 3: installing the WING
❑ Set the wing into the wing saddle and push it firmly into place.
q Carefully center the wing from side-to-side, then use two #64 rubber bands
to temporarily hold the wing in place.
IMPORTANT Use a minimum of six #64 rubber bands to hold the wing in place for flight.
Page STABILIZER INSTALLATION
You'll Need the following parts FROM THE KIT:
❑ (1) Vertical Stabilizer with Rudder
❑ (1) Horizontal Stabilizer with Elevator
You'll Need the following TOOLS AND SUPPLIES:
❑ 5 Minute Epoxy
q 220 Grit Sandpaper with Sanding Block
❑ Modeling Knife
q Masking Tape
❑ Straight Edge Ruler
q Paper Towels
❑ Pencil
q Rubbing Alcohol
q T-Pins
q Epoxy Mixing Sticks
q Builder's Triangle
q Epoxy Mixing Cups
Step 1: aligning the horizontal stabilizer
❑ Cut away the covering material from over the horizontal and vertical
stabilizer mounting slots in the fuselage.
❑ Measure and draw a centerline mark on the top of the trailing edge of the
stabilizer.
❑ Extend the centerline mark across the top of the stabilizer, using a builder’s
triangle to ensure that the line is perpendicular to the trailing edge.
❑ Slide the stabilizer into the mounting slot and temporarily align it. The
trailing edge should be even with the back edge of the fuselage, and the
centerline you drew should be centered within the vertical stabilizer mounting
slot, when viewed from above.
❑ When satisfied that the stabilizer is centered, hold only the trailing edge
of the stabilizer in place, using a T-Pin.
IMPORTANT The front of the stabilizer should be able to pivot slightly
from side to side and the back should stay firmly in place and aligned. The
trailing edge should not be allowed to move from side to side.
Page 10
❑ With the wing mounted to the fuselage and centered, measure the distance
between the tips of the stabilizer and the tips of the wing. Pivot the front of
the stabilizer until both of these measurements are equal.
☞When both of these measurements are equal, you're assured that the
stabilizer is square to the wing.
❑ When you're satisfied that the stabilizer is square to the wing, hold the
front of the stabilizer in place, using a T-Pin, then draw a mark on each side
of both the front and the back of the stabilizer where it and the fuselage
sides meet.
+These marks will help you realign the stabilizer after you remove it and
glue it back into place.
❑ With the stabilizer held firmly in place, look from the front of the airplane
at both the wing and the stabilizer. When aligned properly, the stabilizer
should be parallel to the wing.
IMPORTANT If the stabilizer is not parallel to the wing, remove it and use 220 grit sandpaper with a sanding block to sand down
the higher side of the stabilizer mounting slot, until you are satisfied with the alignment.
Step 2: installing the horizontal stabilizer
❑ Once you're satisfied with the alignment, draw a line on each side of the
stabilizer where it meets the fuselage. Do this on both the top and the bottom.
❑ Remove the stabilizer from the fuselage, then carefully cut away the
covering material from inside the lines you drew. Remove the covering
material from both the top and the bottom of the stabilizer.
WARNING When cutting through the covering to remove it in the next
procedure, cut with only enough pressure to cut through only the covering
itself. Cutting down into the balsa structure could weaken the stabilizer
and cause it to fail during flight.
❑ To make it less messy during installation, apply masking tape to both
sides of the fuselage around the mounting slot, and to the top and bottom of
the stabilizer, too.
Page 11
❑ Apply a generous amount of 5 minute epoxy to the gluing surfaces of both the stabilizer and the fuselage, then push the stabilizer
into place and realign it, double-checking all of your measurements once more before the epoxy sets up. Remove any excess
epoxy and use T-Pins to hold the stabilizer in place and aligned until the epoxy has fully cured.
Step 3: Aligning the vertical stabilizer
❑ Cut away the covering material from over the elevator joiner relief notch
in the leading edge of the rudder.
❑ Push the stabilizer into the mounting slot. To align it properly, the trailing
edge of the stabilizer should be even with the back edge of the fuselage and
the stabilizer should be pushed down firmly.
IMPORTANT Double-check that the elevator and rudder don’t interfere with each other when moved. If they do, enlarge the
elevator joiner relief notch in the rudder.
Step 4: installing the vertical stabilizer
❑ While holding the stabilizer in place, draw a line on each side of the
stabilizer where it meets the top of the fuselage.
❑ Remove the stabilizer and carefully cut away the covering material from
below the lines you drew. Cut away the covering material from the base of
the stabilizer, too.
❑ Glue the stabilizer into place, using 5 minute epoxy. Double-check all of
your measurements once more before the epoxy sets up, then wipe away any
excess epoxy, and hold the stabilizer in place until the epoxy has fully cured.
IMPORTANT Use a builder's triangle to make sure that the vertical
stabilizer is perpendicular to the horizontal stabilizer.
Page 12
ELEVATOR AND RUDDER CONTROL SYSTEMS INSTALLATION
You'll Need the following parts FROM THE KIT:
❑ (1) 5-1/2" (140mm) Threaded Wire with Z-Bend
❑ (2) Nylon Clevises
q (1) 4-1/8" (105mm) Threaded Wire with Z-Bend
q (4) M2 x 10mm Machine Screws
❑ (2) Nylon Control Horns with Backplates
You'll Need the following TOOLS AND SUPPLIES:
❑ Thin C/A
q 1/16" (1.6mm) & 5/64" (2mm) Drill Bits
q # 1 Phillips Head Screwdriver
❑ Straight Edge Ruler
q Needle Nose Pliers
❑ Pencil
❑ Modeling Knife
q Masking Tape
q Electric or Hand Drill
Step 1: installing the Servos
❑ Cut away the covering material from over the elevator servo mounting
hole in the left side of the fuselage and from over the rudder servo mounting
hole in the top of the fuselage.
❑ Plug one 12" long servo extension onto both your elevator and rudder servos.
IMPORTANT If you mount your receiver near the back of the wing saddle, 12” long servo extensions will be long enough. If you
mount your receiver farther forward, you may need to use longer servo extensions.
❑ Install the elevator and rudder servos into the mounting holes, making
sure to drill 1/16" (1.6mm) diameter pilot holes for the mounting screws. Both
servo output shafts should be toward the front of the fuselage.
IMPORTANT Depending on the height of your elevator servo, you may
need to cut away the covering material from the right side of the fuselage
to allow the bottom of the servo to stick out beyond the fuselage side.
Step 2: installing the elevator control linkage assembly
❑ Position and mark the mounting hole locations for the control horn on the
bottom of the elevator. When aligned properly, the centerline of the control
horn should be 3/4" (19mm) out from the side of the fuselage and the clevis
attachment holes should be lined up over the hinge line. The base of the
control horn should be parallel to the hinge line, too, so that the control horn
will line up with the pushrod wire.
❑ Drill 5/64" (2mm) diameter pilot holes through the elevator for the control
horn mounting screws, then apply a couple of drops of thin C/A to the pilot
holes and allow the C/A to fully cure.
☞The C/A will harden the surrounding balsa, making the mounting area
stronger.
Page 13
❑ Install the control horn and backplate, using two M2 x 10mm machine
screws.
❑ Cut away all but one arm from a "4-point" servo horn, then install the
Z-Bend in the 4-1/8" (105mm) long pushrod wire into the outermost hole in
the servo arm.
☞You may need to enlarge the hole to fit the diameter of the wire.
❑ Center the servo, then install the servo horn onto the servo, making sure
that the servo horn is centered and pointing down toward the bottom of the
fuselage.
❑ Install the servo horn retaining screw to secure the servo horn to the
servo.
❑ With both the elevator servo horn and the elevator centered, thread one
nylon clevis onto the pushrod wire and snap the clevis into the outermost
hole in the control horn.
❑ Double-check that both the servo horn and the elevator are still centered. If necessary, thread the clevis in or out to center the
elevator, then move the elevator up and down several times to ensure proper movement.
Step 3: installing the rudder control linkage assembly
❑ Position and install one control horn onto the left side of the rudder, using
the same techniques that you used to install the elevator control horn. When
positioned properly, the centerline of the control horn should be 2‑1/8" (54mm)
up from the bottom of the rudder and the clevis attachment holes should be
lined up over the hinge line. The base of the control horn should be parallel to
the hinge line, too, so that the control horn will line up with the pushrod wire.
IMPORTANT Don't forget to apply a couple of drops of thin C/A to the
pilot holes.
❑ Install the Z-Bend in the 5-1/2" (140mm) long pushrod wire into the
outermost hole in a "4-point" servo horn.
❑ Center the rudder servo, then install the servo horn onto the servo, making
sure that the servo horn is centered and pointing out toward the side of the
fuselage.
Page 14
❑ Install the servo horn retaining screw to secure the servo horn to the servo.
❑ With both the rudder servo horn and the rudder centered, thread one
nylon clevis onto the pushrod wire and snap the clevis into the outermost
hole in the control horn.
❑ Double-check that both servo horn and the rudder are still centered. If
necessary, thread the clevis in or out to center the rudder, then move the
rudder right and left several times to ensure proper movement.
AILERON CONTROL SYSTEMS INSTALLATION
You'll Need the following parts FROM THE KIT:
❑ (2) 2-3/4" (70mm) Threaded Wires with Z-Bends
❑ (2) Nylon Clevises
❑ (2) Nylon Control Horns with Backplates
q (4) M2 x 10mm Machine Screws
You'll Need the following TOOLS AND SUPPLIES:
❑ Thin C/A
q 1/16" (1.6mm) & 5/64" (2mm) Drill Bits
q # 1 Phillips Head Screwdriver
❑ Straight Edge Ruler
q Needle Nose Pliers
❑ Pencil
❑ Modeling Knife
q Masking Tape
q Electric or Hand Drill
Step 1: installing the servos
❑ Cut away the covering material from over the two aileron servo mounting
holes and the aileron servo lead exit hole in the bottom of the wing.
❑ Tie the end of the piece of string that's preinstalled in the wing to the
aileron servo lead and use that to pull the servo lead through the paper tube
and out the servo lead exit hole.
❑ Install the aileron servo into the mounting hole, making sure to drill 1/16"
(1.6mm) diameter pilot holes for the mounting screws. The servo output
shaft should be toward the back of the wing. IMPORTANT Depending on the length of your servo lead, you may
need to add a servo extension lead to reach out through the bottom of
the wing.
q Repeat the previous procedures to install the second aileron servo in the other half of the wing.
Page 15
Step 2: installing the aileron control linkage assemblies
❑ Position and install one control horn onto the bottom of one aileron, using
the same techniques that you used to install both the elevator and the rudder
control horns. When aligned properly, the centerline of the control horn
should be 4-1/2" (114mm) out from the inside edge of the aileron and the
clevis attachment holes should be lined up over the hinge line. The base of
the control horn should be parallel to the hinge line, too, so that the control
horn will line up with the pushrod wire.
IMPORTANT Don't forget to apply a couple of drops of thin C/A to the pilot holes.
❑ Install the servo arm, pushrod wire and clevis, using the same techniques
that you used to install the elevator and rudder servo arms, pushrod wires
and clevises.
IMPORTANT The servo arm should point toward the middle of the
wing. Don't forget to install the servo horn retaining screw to secure the
servo horn to the servo.
❑ Double-check that both the servo horn and the aileron are still centered. If necessary, thread the clevis in or out to center the
aileron, then move the aileron up and down several times to ensure proper movement.
q Repeat the previous procedures to install the second aileron control linkage assembly. When adjusting the second aileron control
linkage, make sure that both ailerons are even with each other. You don’t want one aileron to be higher or lower than the other one.
LANDING GEAR INSTALLATION
You'll Need the following parts FROM THE KIT:
❑ (2) Landing Gear Wires
q (2) Nylon Axle Spacers
q (1) Tail Skid
q (2) Wheel Collars
❑ (2) Wheels
q (2) M3 x 5mm Machine Screws
❑ (2) Nylon Landing Gear Straps
q (4) M2 x 10mm Wood Screws
You'll Need the following TOOLS AND SUPPLIES:
❑ 5 Minute Epoxy
❑ Pencil
q # 1 Phillips Head Screwdriver
q Paper Towels
❑ Modeling Knife
q Rubbing Alcohol
q Electric or Hand Drill
q Epoxy Mixing Sticks
q 1/16" (1.6mm) Drill Bit
q Epoxy Mixing Cups
❑ Straight Edge Ruler
Step 1: installing the tail skid
❑ Cut away the covering material from over the tail skid mounting hole in
the bottom of the fuselage.
Page 16
❑ Test-fit and glue the tail skid into place, using a generous amount of glue.
+Make sure that the tail skid faces toward the back of the fuselage and
that it's lined up straight with the bottom of the rudder.
Step 2: installing the landing gear wires
❑ Cut away the covering material from over the landing gear mounting slot
in the bottom of the fuselage.
❑ Insert the 90º bend in each of the landing gear wires into the predrilled
holes in the mounting slot.
❑ Push the landing gear wires firmly down into the slot.
❑ Position the two nylon straps over the landing gear wires, 5/8" (16mm)
in from the fuselage sides.
❑ Mark the locations of the mounting screws onto the fuselage.
IMPORTANT Make sure that the nylon straps are centered over the
landing gear wires when you mark the positions of the mounting screw
holes.
❑ Drill four 1/16" (1.6mm) diameter pilot holes through the fuselage at the
marks you drew.
❑ Install the two nylon landing gear straps, using four M2 x 10mm wood
screws, to hold the landing gear wires in place.
Step 3: installing the wheels
❑ Push one nylon spacer completely onto each axle.
Page 17
❑ Slide one wheel onto each axle and secure the wheels into place, using
one wheel collar and one M3 x 5mm machine screw.
☞Tighten the machine screws firmly, then double-check that both wheels
spin freely.
FINAL ASSEMBLY
You'll Need the following parts FROM THE KIT:
q (1) Decal Set
❑ (1) Hook and Loop Material
You'll Need the following TOOLS AND SUPPLIES:
q # 1 Phillips Head Screwdriver
q 5/64” (2mm) Drill Bit
q Adjustable Wrench
q Soldering Iron
q Wire Cutters
q Solder
❑ Modeling Knife
q Heat-Shrink Tubing
q Scissors
q Heat Gun (for Heat-Shrink Tubing)
q Electric or Hand Drill
IMPORTANT The mounting locations of the ESC, receiver and battery may differ from that shown. You may need to mount your
ESC, receiver and battery in slightly different locations, depending on how your model balances.
Step 1: installing the electronic speed control
❑ Mount your ESC to the side of the fuselage, using a piece of double-sided
foam tape (not included).
q If your ESC features an on/off switch, mount it to the fuselage side.
IMPORTANT If you don't want to solder the motor wires directly to the ESC motor wires, make sure to use high-quality
connectors between the motor and the ESC to prevent current loss.
Step 2: installing the receiver
❑ Plug the servo and ESC leads into their proper slots in your receiver, then
mount your receiver to the fuselage floor, using a piece of double-sided foam
tape (not included).
+Plug a Y-Harness into the aileron slot in your receiver, so that you can
connect the aileron servo leads when you install the wing. If you are
planning on plugging the ailerons separately into your receiver, plug aileron
servo extension leads into the receiver.
Page 18
❑ Drill a 5/64" (2mm) diameter hole through the bottom of the fuselage for the antenna to exit, then run the antenna out and along
the bottom of the fuselage. Use pieces of clear tape to secure it into place along the length of the fuselage. Do not cut the antenna
shorter. Allow the excess to hang beyond the back of the fuselage.
Step 3: installing the battery
❑ Mount the battery to the fuselage floor, directly behind the motor, using
the strip of hook and loop material included.
Step 4: installing the propeller
❑ Install your propeller onto the motor.
IMPORTANT Make sure to tighten the propeller nut firmly.
Step 5: applying the decals
❑ Using a clean cloth, wipe the airframe down completely to remove any dust, debris and oil.
❑ Cut out each of the decals and apply them using the box cover photos for reference. If any air bubbles form under the decals
when you apply them, use a T-Pin to puncture the bubble and release the trapped air, then press the decal down.
BALANCE POINT AND CONTROL THROWS
Balance Point:
The Center of Gravity (C/G or Balance Point) is 3" to 4-1/2" (76mm to 114mm) back from the leading edge of the wing,
measured at the fuselage sides. For test flying, start with the balance point at the middle of the C/G range 3-3/4" (95mm).
WARNING For test flying and general sport flying, we suggest you balance the airplane at the C/G recommended above.
Experienced pilots can experiment with the C/G range as far back as 5" (127mm).
CONTROL THROWS:
3D Flying
Test Flying and Sport Flying
Ailerons:
5/8" (16mm) Up and Down
Ailerons:
1-1/2" (38mm) Up and Down
Elevator:
1/2" (13mm) Up and Down
Elevator:
1" (25mm) Up and Down
1/2" (13mm) Right and Left
Rudder:
Maximum Deflection Right and Left
Rudder:
The control throws are measured from the widest point of the control surfaces
EXPONENTIAL:
For all control surfaces, we recommend 15% to 25% exponential on high rates (3D Flying). For more information about exponential
and how to program it, please refer to your radio system's user's guide.
Page 19
PREFLIGHT CHECK AND SAFETY
Check the operation of the throttle. Double-check that you're getting full power when the throttle control stick is at full.
●
☞If you're using a computer radio, you may need to increase your throttle channel's EPA setting to result in full power.
(Refer to
your radio system's operating guide for further information.)
Check the condition of the transmitter batteries. They should be fully charged.
●
Check every glue joint in the airplane to ensure that everything is tight and well-bonded.
●
Double-check that you've installed and tightened all of the servo horn retaining screws.
●
Double-check that the battery is properly secured into place. There's nothing worse than the battery coming loose during flight.
●
Double-check the balance of the airplane. Do this with the battery installed and the airplane ready to fly.
●
Check the control surfaces. They should all move in the correct direction and not bind.
●
If your radio transmitter is equipped with dual rate switches, double-check that they are on the low-rate setting for your first few
flights.
●
Check to ensure that all of the control surfaces are moving the proper amount in both low and high rate settings.
●
Check the receiver antenna. It should be fully extended and not coiled up inside the fuselage. Do not cut the receiver antenna
shorter or the range of your radio control system will be greatly reduced.
●
You should complete a successful range check of your radio equipment prior to each new day of flying, or prior to the first flight of
a new or repaired model.
●
You should not knowingly operate your R/C radio system within 3 miles of a preexisting model club flying field without a frequency
sharing agreement with that club.
●
REPLACEMENT PARTS LIST
When it comes time to order replacement parts, we recommend ordering directly from your local hobby retailer.
If your hobby retailer does not stock Model Tech products, you can order replacement parts directly
from your local distributor, using the Customer Service Information on page 2.
Instruction Manual............................................................119980
Stabilizer Set....................................................................119983
Wing Set...........................................................................119981
Hardware Set (Includes Landing Gear)............................119984
Fuselage Set....................................................................119982
Page 20
If you liked the Model Tech Apex 3D EP ARF, here's a few of the many
other Model Tech ARF airplanes that are currently available:
Mini Magic Extra ARF
(P/N 123661) (MT3192D-5)
Inspired by it's larger brother, the Magic Extra, this smaller version has the
construction you expect: Laser cut parts, Quality Contruction, Iron-On covering,
Fiberglass Cowl and all the design features that make the Magic Extra so great:
Thick Airfoil, Light Wing Loading, Generous Wing Area and Large Control Surfaces.
Model Tech has combined it all to make this a fun and great performing airplane.
Model Tech recognizes that modelers around the world want selection. So, this
Mini has the ability to take glow or electric power. Install a .15 two-stroke or a
30 four-stroke engine, or for you electric enthusiasts, drop in a Multiplex 480 BL 4T
Geared motor and watch it dance! Hardware for both are already included and an
easy access panel is standard for the fuel tank area, which is also where your
flight battery is installed if you are flying electric.
Sukhoi SU-31 3D Profile ARF
(P/N 123741) (MT3192K)
The Model Tech Profile Sukhoi ARF (almost ready to fly) is a
high performance pilots dream, whether you are an expert or
working your skills to achieve such skill. Built with the finest
wood materials, the Sukhoi is a plane that will advance your
flying prowess beyond mere loops and rolls. The Profile Sukhoi
will hover, knife edge, perform blenders, and all the advanced
3D aerobatics. The ModelTech engineers have designed the
Sukhoi 31 to handle superbly due to its lightweight wing
loading, tapered wings, and HUGE control surfaces. Factory
built and covered with Monokote.
Fledgling EP ARF
(P/N 123505) (MT3209E)
The Fledgling is the perfect electric trainer. With its large size and
affordable electronics you will not have any of the high start-up costs
associated with smaller electric models. The simple layout and trouble
free installation make assembly a pleasure. A light wing loading and
ample power together with rock steady flight characteristics make
learning easy. This, combined with a model that has full four channel
functions will help you to grow your piloting skills as you progress to
more advance aerobatics.
Mach Racer Delta ARF
(P/N 123780) (MT3211B)
Fast and Agile... Ready for an adrenaline high? Well, hold on tight when you
fly the Mach Racer from Model Tech. This is one fast delta. At 3.5 lbs flying
weight, power-to-weight is certainly no issue when you install your favorite
46 two-stroke engine. The simple and clean airframe makes this delta fast
and fun to fly. Because it's a delta, you do not have to worry about
slow-speed handling! It is amazingly gentle at slow speeds for such a fast
plane. The Mach Racer is easy to take off and land, and taxi's nicely if you
use the included landing gear. Go on, grin ear-to-ear, it's ok. Speed is fun and
the Mach Racer delivers.
Page 21
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Telling us what you like and don't like determines what model kits we make and how we make them. We would appreciate it if you would take a
few minutes of your time to answer the following questions about this kit and your modeling interests. Simply fold this form on the dotted lines, seal
with tape and mail it to us. Do not use staples and make sure our address faces out.
Global Hobby Distributors will not disclose the information it collects to outside parties. Global Hobby Distributors does not sell,
trade, or rent your personal information to others. Your privacy is important to us.
7) Was any of the assembly difficult for you? If yes, please explain.
❑ Yes
❑ No
________________________________________________
1) Kit: Model Tech Apex 3D EP ARF # 128508
2)
Where did you learn about this kit?
❑ Magazine Ads
❑ Friend
❑ Hobby Shop
❑ Other
❑ Internet
3)
What influenced you the most to buy this kit?
❑ Magazine Ads
❑ Price
❑ Type of Model
❑ Box Art
❑ Recommendation
❑ Other
❑ Internet
________________________________________________
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8)
What did you like most about this kit?
❑ Assembly Manual
❑ Parts Fit
❑ Hardware Supplied
❑ Price
❑ Other
4) Did you have any trouble understanding the written instructions? If 9)
yes, please explain.
❑ No
❑ Yes
________________________________________________
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6)
Were any of the kit parts:
❑ Damaged
❑ Missing
_______________________________________________
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11) How does this kit compare to similar kits by other manufacturers?
❑ Better
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❑ Wrong Size
❑ Wrong Shape
If you checked any of the boxes above, did you contact our Customer Service Department to resolve the problem?
❑ Yes
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What is Your Age Group:
❑ 10 & Under
❑ 11 - 20
❑ 21 - 30
How Many Years Have You Been in the Hobby?
❑ Less than 1
❑ 2 - 4
❑ 5 - 7
10) Are you satisfied with the finished model? If no, please explain.
❑ Yes
❑ No
5) Did you have any trouble understanding any of the photographs? If yes, please explain.
❑ Yes
❑ No
What did you like least about this kit?
❑ Assembly Manual
❑ Parts Fit
❑ Hardware Supplied
❑ Price
❑ Other
QC #
❑ 31 - 40
❑ 41 - 50
❑ 51 - 60
❑ 61 - 70
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How Many Models Have You Purchased In the Last Year?
❑ 0 - 1
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❑ 10 or More
Please List any Other Modeling Interests or any Additional Information about This Product:
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Page 23
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Page 24