GOTHA G.IV HEAVY BOMBER

GOTHA G.I V HEAVY BOMBER
1/15TH SPORT-SCALE ARF R/C MODEL AIRPLANE
INSTRUCTION MANUAL
Pictured with optional
front- and rear-facing
machine guns, twin
Uranus 28309 motors
and 8x6 propellers.
The Gotha G.IV heavy bomber was used by the Imperial German Air Service during World War I. Designed for longrange service, on 25 May 1917, Gotha G.IVs bombing London caused the most severe casualties of any bombing raid of
the war.
Up to 1,100 pounds (500 kg) of bombs were carried externally. The Gotha G.IV
pilot‟s seat was offset to port and a connecting walkway allowed crew members to move
between gun stations. An unusual innovation was a "gun tunnel" – the underside of the
rear fuselage was open, and there was a slot in the upper surface of the fuselage that
allowed the rear gunner to fire down through the fuselage to provide defense against
attacks from below and behind as shown at the right.
This sport-scale ARF twin electric-powered pusher is designed for mid-to-advancedlevel ARF-assemblers and pilots, features a 62 1/2-inch wingspan, outer wing panels that are removable, and scale-looking
engine nacelles and landing gear.
We invite you to enjoy the pride of ownership and the joy of flying this beautiful
ARF sport-scale model of the famous GOTHA G.IV heavy bomber.
TABLE OF CONTENTS
I.
II.
III.
IV.
Safety precautions & assembly tips ....................
Warranty, liability waiver & return policy ..........
Specifications ......................................................
Parts list ...............................................................
Copyright 2014 Maxford USA
2
3
3
4
V.
VI.
VII.
VIII.
IX.
Special features .................................................... 4
Assembly Instructions ......................................... 5
Setup and adjustments ........................................ 16
Storage, field setup & preflight checks .............. 17
Flying tips ........................................................... 17
Page 1 of 18
Gotha G.IV heavy bomber / S140919
I. SAFETY PRECAUTIONS & ASSEMBLY TIPS
(IMPORTANT – READ THIS SECTION BEFORE YOU BEGIN ASSEMBLY)
1. This product should not be considered a toy, but rather a sophisticated, working model that functions much like a fullscale airplane. Because of its performance capabilities, this product, if not assembled and operated correctly, could
cause injury to you or spectators and damage to property. Maxford USA provides you with a high-quality, thoroughly
tested model airplane kit with assembly instructions. However, the quality and capabilities of your finished model
airplane depend on how you assemble it, and your safety depends on how you use and fly it. Any testing or flying of
this model airplane is done entirely at your own risk.
2. Assemble this model airplane according to these instructions. Do not alter or modify the model beyond the assembly
and power-system options covered in these instructions, as doing so may result in an unsafe or unworkable model. If
the instructions differ from the photos, the written instructions should be considered correct. If you have any question
or concern about these instructions, before you proceed with assembly of this product, contact your dealer or speak to a
Maxford USA customer service representative at 562-529-3988 (Monday through Friday, except national holidays,
9 AM to 5 PM Pacific Time).
3. While this kit has been flight-tested to meet or exceed our rigid performance and reliability standards in normal use, if
you elect to perform any extremely high-stress flying, such as racing or advanced aerobatics, or if you install a much
larger power system than specified, you (the buyer or user of this product) are solely responsible for taking any and all
necessary steps to reinforce the high-stress points and/or substitute hardware that is more suitable for such increased
stresses.
4. Throughout the lifetime of this model, use only the Maxford USA-recommended power system and a new or wellmaintained radio-control system.
5. It is your responsibility to install the receiver and connect the R/C components in such a way that this model airplane
passes all applicable safety/range tests and that the power system and controls operate correctly and smoothly.
6. Recheck the operation of this model airplane before every flight to ensure that all equipment is still operating correctly
and that the model has remained structurally sound. Also before every flight, check all electrical, control and structural
connections; do not fly without replacing any that you find damaged or worn.
7. Before you begin assembly of this model airplane, read all instructions and test-fit each part to ensure you fully
understand the instructions and that no parts are missing, damaged or unsatisfactory. Temperature and/or humidity
differences between the factory, our warehouse and your home or workshop may dictate the need for slight
adjustments to the wings, struts and/or the vertical or horizontal stabilizer‟s mounting surfaces to ensure proper
alignment; however, we recommend you contact us before you attempt any such adjustments.
8. To help ensure the security of any servo-to-extension connections, optional Maxford USA servoextension safety clips are recommended.
9. Assemble EZ-Link connectors (which may be included or an
option for this model) as shown at the right.
While applying threadlock compount or CA
adhesive, be careful to NOT glue the EZ-Link
connector to the control arm or mounting tab.
Be careful to not let the pushrod bind
10. As shown at the right, this model
allows customers some choice in
aileron servo selection:
a. Test-fit your aileron servos
and the supplied wood
mounting pedestals to the
servo hatch covers.
b. Use epoxy to attach the
mounting pedestals to each
servo hatch cover. Use the
hardware provided with your
servos to mount the aileron
servos to their hatch covers.
c. Using your radio or a servo tester, center the aileron servos.
Copyright 2014 Maxford USA
Page 2 of 18
Clamping bolt
Connector body
Control arm (or mounting tab)
Washer
Mounting nut
Gotha G.IV heavy bomber / S140919
11.
12.
13.
14.
15.
16.
17.
d. Insert a piece of stiff wire through the wing from the root into
the servo bay. Tape the end of the servo extension to the wire
and pull it through the wing.
e. Guide the servo wire into the servo bay as instructed for the
model you are assembling. Cover the servo bay with the
servo-hatch. Secure the hatch to the wing with screws or glue.
If you are not an experienced ARF assembler or R/C pilot or have not flown this type of model before,
we strongly urge you to get assistance from an experienced ARF assembler or R/C pilot.
You may use 30-minute epoxy to attach critical parts permanently (such as where the horizontal and vertical stabilizers
attach at the end of the fuselage) and apply threadlock compound to secure all airframe components from vibration.
If you have concern about the security of any factory fabrication procedure(s), you may apply 30-minute epoxy around
the perimeter of such part(s) as an extra safety precaution.
This model may include some plastic, fiberglass and/or carbon-fiber-reinforced parts. If you drill, grind or sand any
such part, always wear safety goggles, a particle mask and rubber gloves to guard yourself from eye, skin and
respiratory-tract irritation; never blow into the part as the dust may blow back into your face.
Minor production details may vary.
Check the Mylar covering material‟s joints and surfaces; if necessary, carefully use an iron (do NOT set the iron‟s
temperature too high) to secure the edges and to tighten any loosened areas. Recheck and retighten from time to time.
Read all instructions included with your batteries and charger. Failure to follow all instructions could result in
permanent damage to the battery, its surroundings, and bodily harm! If you crash this model airplane, check whether
the batteries are damaged. Do NOT attempt to use or recharge a damaged battery.
II. WARRANTY, LIABILITY WAIVER & RETURN POLICY
Maxford USA guarantees this kit to be free from defects in material and workmanship at the time of purchase. All our
products have been inspected in our factory and are checked again when shipped from our warehouse. However,
Maxford USA cannot directly control the materials you may use or your final assembly process. Therefore, Maxford
USA cannot in any way guarantee the performance of your finished model airplane. Furthermore, in purchasing,
assembling and/or using this product, you (the buyer or user of this product) exempt, waive, and relieve Maxford USA
from all current or future liability for any personal injury, property damage, or wrongful death, and if you (the buyer or
user of this product) are involved in any claim or suit, you agree that you will not sue Maxford USA or any of its
representatives.
If you do not fully accept the above liability and waiver, you may request a return-merchandise authorization number
(RMA#) as explained below in item 2. If you think there is a missing, damaged or unsatisfactory part, please read our
after-sales service and return policy:
1. Inspect your order upon delivery for any missing, damaged or unsatisfactory part(s). If you believe there is a
problem, you must call us at 562-529-3988 (Monday through Friday except holidays, between the hours of 9 AM
and 5 PM Pacific time) before you begin assembly and within 10 days from receipt of your purchase. During this
telephone conversation, and with your support, we will determine how to resolve your concern.
2. To request a return-merchandise authorization number (RMA#), call 562-529-3988 (Monday through Friday except
holidays, between the hours of 9 AM to 5 PM Pacific Time). If we elect to issue you an RMA#, you must clearly
mark this RMA# on the outside of the package. (No return or exchange will be authorized after 10 days from the
date of your receipt of the product; any package delivered to us without a Maxford USA RMA# is subject to being
returned to the sender, as received, with return postage payable upon delivery.) Returned merchandise must be in its
original condition as received from Maxford USA, with no assembly or modification, in the product‟s original
packing materials, complete with all manuals and accessories. Return shipping and insurance charges must be
prepaid by you, the buyer.
3. Returned merchandise that is accepted by Maxford USA for credit is subject to a 10% to 20% restocking fee (the
final amount will be determined by Maxford USA upon receipt and examination of the returned merchandise).
Return address:
Maxford USA
15939 Illinois Avenue, #B-C
Paramount, CA 90723
IMPORTANT: Print the RMA# issued by Maxford USA on your package near our address.
Copyright 2014 Maxford USA
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Gotha G.IV heavy bomber / S140919
III. SPECIFICATIONS*
Wingspan ............................................................................................................................................... 62 1/2-inches
Wing Area .................................................................................................................................................... 609 sq in
Length ......................................................................................................................................................... 33 inches
ARF weight ................................................................................................................................... 2 pounds 7 ounces
Flying weight ....................................................... 4 pounds 6 ounces (depending on your radio and power system)
Wing loading ........................................................................................................................................... 16.5 oz/sq ft
Recommended power system (not included) ................. Two(2) Maxford USA U28309 motors, two(2) 25A ESCs
and two(2) 3S/2,200 mAh LiPo batteries in parallel, or equivalent electric power system
Propellers (not included) ........................... Two(2) slow fly 8x6, or as recommended by the power system‟s maker
(NOTE: See page 5 for the option to use counter-rotating propellers)
Radio (not included) ............................................................................................................ Minimum of 4 channels
(NOTE: At least 5 channels are needed if you setup differential ailerons)
Servos (not included) ................................................................. Two(2) analog micro-servos for rudder & elevator
plus two(2) analog micro-servos for the ailerons
Center of gravity (CG) .......................................... 2-inches to 2 1/8-inches behind the leading edge of the top wing
measured where the top wing‟s outer wing panels meet the top wing‟s center section.
*(All dimensions and weights are approximate.)
IV. PARTS LIST
A. SUPPLIED ITEMS:





Prebuilt Mylar-covered fuselage, wings, ailerons, horizontal stabilizer, elevator, vertical stabilizer and rudder.
Wheels and composite landing gear struts.
 Prepainted twin engine nacelles.
Simulated propeller guards and pilot‟s control
cable controls at each side of the fuselage.
All necessary hardware items, including a
custom-built, preinstalled harness to connect
your LiPo flight batteries and servos to your
electronic speed controls and receiver.
Preinstalled connectors for electronic speed
controls and two Lipo flight batteries in
parallel.
B. ITEMS YOU NEED TO SUPPLY
TO COMPLETE THIS MODEL:
 Epoxy and cyanoacrylate (CA) adhesives and threadlock compound.
 Low-tack masking tape and common hand tools (screwdriver, pliers, etc.).
 Your 4- (or more) channel radio system; two 10- to 15-inch servo extensions, 2 micro servos and a 6-inch
Y-harness (not necessary with differential ailerons) for the ailerons; and 2 micro servos for the rudder and
elevator.
 Two(2) Maxford USA U28309 motors, two(2) 25A ESCs and two(2) 3S minimum 2,200 mAh LiPo batteries,
or an equivalent power system.
 Two(2) slow-fly 8-inch diameter x 6-inch
pitch propellers, or as specified for your
motors.
C. OPTIONAL DETAIL-UPGRADE ITEMS:
 Simulated front- and rear-facing machine
guns and gun mounting hardware as shown
at the right.
Copyright 2014 Maxford USA
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Gotha G.IV heavy bomber / S140919
V. SPECIAL FEATURES:

Adjustable motor box in each nacelle, able to accommodate a large range of motor sizes.
 Easy-to-remove nacelle fronts, secured with powerful permanent magnets.
 Preinstalled power harness with included parallel connector for flight batteries.
 Preinstalled throttle Y-harness and aileron extensions.
Preinstalled
power harness
with connectors,
throttle
Y-harness and
aileron extensions




Root rib of lower wing’s
center section
The battery compartment easily accommodates two(2) 2,200
mAh LiPo batteries in parallel.
Battery hatch is aligned with wooden dowels and secured in
position with two sets of strong magnets.
Included scale-looking stick-on markings.
Replacement parts are available.
Dowels
VI. ASSEMBLY INSTRUCTIONS
A. FUSELAGE:
1. Attach EZ-Link connectors to the outer ends of the output arms of
Elevator
your rudder and elevator servos.
servo
2. Use your radio or a servo tester to center the elevator and rudder servos.
(You may learn about servo testers at http://www.maxfordusa.com/servo.aspx.)
3. Use the hardware provided with your servos to install the elevator and rudder servos
in the fuselage as shown at the right.
Rudder
4. Guide the elevator‟s and rudder‟s pushrods into their EZ-Link
servo
connectors and attach the servo output arms to the rudder and
elevator servos.
5. Temporarily tighten the EZ-Link connectors onto the elevator
and rudder pushrods.
6. Attach a simulated propeller guard to each side of the fuselage
by driving wood screws through
the openings in the propeller
guards and into the sides of the
fuselage.
Copyright 2014 Maxford USA
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Gotha G.IV heavy bomber / S140919
B. MOTORS & ELECTRONIC SPEED CONTROLS:
1. Guide each motor‟s 3 wires through the slotted opening in the firewall
and into the motor mounting box.
2. Connect the 3 wires from the electronic speed control to the 3 wires on
the motor inside each motor-mounting box.
3. Using the hardware provided with your motors, center and mount the
motors onto the rear-facing „firewall‟ surface of each motor-mounting
box. (NOTE: Position the slotted opening at the rear of each motor box
BELOW each motor. If you use machine screws to mount the motors,
be sure to use threadlock compound.)
4. Connect and test-run each motor to observe its direction of
rotation. Setup both motors to rotate in the clockwise direction
as viewed from the rear of the airplane. (NOTE: This model was
test-flown with two identical propellers rotating in the same direction; it was also test-flown with
counter-rotating propellers – which „look cool.‟ If you will use counter-rotating propellers, be careful
to mark the “L” and “R” motor boxes. Whichever option you choose, both propellers must be mounted
with their front/curved surfaces facing toward the motor in the direction of flight.)
5. Guide the ESC-to-battery wires and the ESC-to-receiver wire out through one of the holes closest to the
firewall in the bottom of the motor box as shown above.
C. LANDING GEAR:
1. Identify and remove the 4 REAR landing gear struts from the parts
package. (Each is approx. 5 1/4 inches long.)
2. Identify and remove the 4 FRONT landing gear struts from the parts
package. (Each FRONT strut is approx. 3 3/4 inches long.)
3. As shown at the right, test-fit the ends of the REAR struts into the
recesses near the rear on each side of the nacelles. Secure the REAR
struts to the nacelles with 5/8 inch (15 mm) wood screws.
4. Position the end of the FRONT struts in the recesses near the
front on each side of the nacelles. Secure all 4 FRONT struts to
the nacelles with 5/8 inch (15 mm) wood screws as shown at
the right. (NOTE: Where the struts overlap at the bottom,
position the front struts closest to the wheels.)
5. Test-fit an axle and two „inner‟ wheel collars
‘Inner’ wheel collars
through the openings in the lower ends of each set of
struts.
6. Place a washer and wheel on each end of the axles.
7. Position washers and „outer‟ wheel collars to hold
the wheels onto each axle.
8. As shown at the right, move the „inner‟ wheel collars
outward until they firmly press against the struts.
(NOTE: If desired, you may apply a small amount of
CA adhesive to secure the lower ends of each pair of
front and rear struts together.)
9. Position all four wheel collars on each axle so the
wheels turn freely and the axles are centered
between their struts. Trim any excess axle length
(Pictured with stock and optional spoked wheels. See
outside the outer wheel collars as required.
http://www.maxfordusa.com/vintagestyle3spokedwhe
10. Securely tighten the wheel collars onto their axles.
els-2.aspx )for information on spoke wheels.)
Copyright 2014 Maxford USA
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Gotha G.IV heavy bomber / S140919
D. TAIL SECTION:
1. If necessary, cut through any Mylar covering the openings in each half of the elevator for the metal joiner.
2. Test-fit the metal joiner into its openings in both halves of the elevator.
3. Use epoxy to secure the elevator‟s metal joiner into each half of the elevator.
Metal joiner
4. Place the elevator on a flat surface until the epoxy cures fully to ensure both
halves of the elevator will be securely glued together and at the same angle.
5. If necessary, cut through any Mylar covering the precut CA-hinge slots for the rudder and elevator.
6. Test-fit the elevator and its CA hinges to the horizontal stabilizer and the rudder and its CA hinges to the vertical
stabilizer. Stick a pin through the center of each hinge to keep them centered as you push the control surfaces
together. Be careful to leave enough space between each control surface and its adjoining panel so the control
surfaces can move freely up and down or left and right approx. 1-inch (25 mm).
7. Apply CA adhesive to permanently attach the elevator to the horizontal stabilizer and the rudder to the vertical
stabilizer.
8. Test-fit the horizontal stabilizer by aligning the slots at the center of the horizontal stabilizer with the slots in the platform at the top rear of the fuselage.
9. As shown at the right, ensure a good wood-to-wood glue joint by using a
soldering iron to burn through carefully and remove the excess Mylar covering
material from the bottom of the horizontal stabilizer.
10. Test-fit the vertical stabilizer to ensure its mounting tabs fit fully through the
openings in the horizontal stabilizer and down into the platform.
11. Use epoxy to permanently secure the horizontal and vertical stabilizers in their
positions. Before the epoxy cures fully, „fine-tune‟ as necessary to ensure the
vertical stabilizer is at 90 degrees to the horizontal stabilizer.
12. Use masking tape to hold the stabilizers in position until the epoxy cures fully.
13. Twist a control horn onto
the Z-bend in the end of
the rudder‟s pushrod. The
rudder pushrod should be
in the outer hole of the
horn. With the pushrod
attached to the control horn,
attach the rudder‟s control
horn to the left side of the
rudder (viewed as though
you were sitting in the
cockpit) as shown at the
right.
14. Twist a control horn
onto the Z-bend in the
end of the elevator‟s
Elevator’s
pushrod. The elevator‟s pushrod should be in the next-to-outer hole.With the
control
control horn attached to the pushrod, attach the elevator‟s control horn to the bottom-right
horn
side of the elevator.
15. Remove all masking tape from the wing panels and tail section when the epoxy has cured fully.
Elevator’s
E. LOWER WING’S CENTER SECTION & ENGINE NACELLES:
control
1. Using a meter or a servo tester, identify and write “A” on both ends of the two preinstalled extensions for the
horn
ailerons. (NOTE: A gold or silver Sharpie pen works great for this purpose.)
2. Write a “T” (for „Throttle‟) on all three of the connectors on the preinstalled Y-harness.
(NOTE: Decide now if you will power your receiver and servos – as we did in all test-flying – with one of the
battery eliminator circuits in your electronic speed controls; or, you may elect to setup your Gotha G.IV heavy
bomber to carry the extra weight of a separate UBEC/SBEC or a receiver battery and power switch.)
Copyright 2014 Maxford USA
Page 7 of 18
Gotha G.IV heavy bomber / S140919
3. If you will power your receiver and servos with the battery eliminator circuit in one of your ESCs, cut the red
wire in one the supplied throttle leads as pictured below. If you will use a separate UBEC/SBEC or receiver
battery and switch: Cut the red wires in BOTH throttle leads. In either case, tape the loose ends of any cut wires to
prevent short circuits.
NOTE: For simplicity,
Cut middle (usually
all wiring is omitted
red) wire. Shown
from this picture.
before covering with
electrical tape.
T
4. Use epoxy to permanently secure 2 composite rods (each
approx. 1 1/4-inch / 33 mm long) into the openings in the leading
edge of the lower wing‟s center section as shown at the right.
5. Attach the lower wing‟s center section to the fuselage using the two
1-inch long bolts and washers provided and the blind nuts
preinstalled in the fuselage.
(NOTE: Connectors are preinstalled at each end of the
power harness to connect your flight battery to your ESCs. If you prefer to use
another type of connector, you may remove the preinstalled connectors and
install your preferred type of connector.)
6. To connect your ESCs to the power harness: As shown at the right, solder the supplied
male connectors (or whatever connectors you prefer) to each of your ESC‟s black and red
power wires. Use heat-shrink tubing to safely insulate the bare metal at each solder joint
as shown.
7. Attach two swivels to each side of the nacelles using the
provided 3/8-inch / 10mm screws. (Four swivels per nacelle.)
8. Attach one swivel to each side of the fuselage just above the
leading edge of the wing saddle.
9. Insert the approx. 20 3/4-inch
(525 mm) long lower wing rod
midway through the lower wing‟s
center section.
Blind
nuts
Lower & upper wing rods
10. Carefully center and tack-glue the lower wing rod in place.
11. As outlined below, trim away the Mylar covering on the sides of the nacelles where each nacelle will be glued to
the root rib of the lower wing‟s center section.
Copyright 2014 Maxford USA
Page 8 of 18
Gotha G.IV heavy bomber / S140919
12. Position the nacelles onto the free ends of the lower wing rod and slide the nacelles toward the root ribs of the
lower wing‟s center section. (NOTE: If you will use counter-rotating propellers, be sure to observe your “L” and
“R” markings.)
13. As each nacelle nears the root rib of the lower wing‟s center section:
a) Guide the connectors labeled „T‟ (for throttle) into
the nacelles.
b) Guide the ends of the harness with the flightbattery-to-ESC connectors into the nacelles.
c) Guide the connectors labeled „A‟ (for aileron) into
the nacelles, then pull the aileron connectors fully
through and out the other side of each nacelle.
d) Use CA or epoxy to glue the nacelles to the outer
ribs of the lower wing‟s center section.
14. As you slide the motor-mounting boxes into their
openings in the nacelles, connect each ESC‟s power leads to the harness‟s flight-battery-to-ESC connectors and
each ESC‟s throttle lead to the connector labeled „T.‟
15. Position the „excess‟ length of the power and throttle wires inside the lower compartment of each nacelle.
16. Connect the rudder and elevator servos and throttle lead to your receiver. Connect the aileron extensions to a
6-inch Y harness and to your receiver – or connect the aileron extensions directly to your receiver if you use
aileron differential. Position your receiver behind the space for the batteries.
F. UPPER WING’S CENTER SECTION:
1. Use four 3/8-inch / 1 cm long screws to attach
four swivels at the outer guide-holes in the
bottom of the upper wing‟s center section
(pictured at the right.)
2. Use four 3/8-inch / 1 cm long wood screws to
loosely attach the engine nacelle‟s upper struts
and swivels into their guide-holes as shown.
3. Use four 3/8-inch / 1 cm
long wood screws to
loosely attach the four
cabane struts near the
center of the bottom of
the upper wing‟s center
section as shown below.
Copyright 2014 Maxford USA
Page 9 of 18
Gotha G.IV heavy bomber / S140919
4. Align and test-fit the cabane struts into the slots on each side
of the cockpit as shown at the right.
5. Align and test-fit the nacelle struts into their
openings at the tops of the nacelles as shown below.
(NOTE: Re-form the bends in these struts to fit their
openings if necessary. With the upper wing‟s center
section properly positioned, the upper and lower
wing‟s center sections have the same angle of attack
and there is approx. 6 inches (or 52 mm) between the
centers of the upper and lower wing‟s wing rods as
shown at the right.)
6. When you are content with the fit of the upper wing‟s
center section to the fuselage and nacelles, secure the
nacelle‟s struts to the nacelles with 3/8-inch / 1 cm
long screws and securely tighten all of the screws that
attach the struts to the top wing‟s center section.
(NOTE: A conservative modeler may also secure the
cabane struts to the fuselage with screws or glue.)
7. Insert and center the upper wing rod through the upper
wing‟s center section, tack-glue it in position.
G. OUTER WING PANELS & AILERONS:
1. Test-fit the ailerons and CA hinges to their wing panels. (NOTE: Cut any excess Mylar covering the CA hinge
slots as necessary.)
2. Center the CA hinges in their slots, stick a pin through each hinge to keep it centered.
3. Use CA adhesive to attach the ailerons to their wing panels.
4. Depending on the length of the wires preinstalled on your aileron servos, attach a 10to 15-inch servo extension to each of the 2 aileron servos.
(REMINDER: We recommend you use safety clips to secure all such connections
as shown at the right. See http://www.maxfordusa.com/servoextensionsafetyclip.aspx
for more information.)
5. As shown at the right, test-fit the supplied aileron horns into
the predrilled holes in the ailerons and glue.
6. Center and attach your aileron servos to their hatch covers.
(NOTE: See pages 2 and 3 for details.)
7. Use 3/8-inch / 1 cm long screws to attach the hatch covers
and aileron servos into their wing panels.
8. Attach the EZ-Link connectors and pushrods to the control
horns and servo output arms as shown at the right. (The
pushrods should be in the outer hole of their servo arms and
the EZ-link connectors should be in the center hole of the
horns.)
Copyright 2014 Maxford USA
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Gotha G.IV heavy bomber / S140919
9. While holding the lower ailerons „level‟ (even with their adjacent wing panels), firmly snug (but do not overly
tighten) each EZ-Link connector onto its aileron pushrod.
10. Leaving approx. 1/2-inch / 13 mm of aileron pushrod length behind each EZ Link connector to allow for „finetuning‟ of the lower ailerons, cut off and discard the ends of the aileron
pushrods that extend excessively behind their EZ-Link connectors.
11. Attach EZ-Link connectors to the preinstalled wooden control horns on
the upper and lower wing‟s ailerons as shown at the right.
(NOTE: While applying threadlock compount or CA adhesive, be
careful to NOT glue the EZ-Link connectors to their mounting tabs.)
12. Identify the wing struts (pictured below on 1/4-inch graph paper).
(NOTE: Front and back struts are the same length.)
13. As shown below, test-fit all the struts toward the outside of each of the
wing panels‟ preinstalled wooden mounting tabs.
14. Using 1/8-inch
(2 mm) diameter
bolts and matching
nuts, loosely attach
Inner struts:
struts:
Inner
the wing struts to
124.7 mm
mm
124.7
the preinstalled
long and
and
long
wooden tabs in the
installed
installed
bottoms of the
closest to
to the
the M
closest
Middle
iddle sstruts:
truts:
upper wing panels
nacelles
nacelles
mm
1115.7
15.7 m
m
and the tops of the
llong
ong aand
nd
lower wing panels.
iinstalled
nstalled
15. Slide each set of top
between
b
e
tween tthe
he
and bottom wing
inner
and
i
n
n
e
r
a
n
d
Outer
Outer struts:
struts:
panels onto their
oouter
uter sstruts
truts
112.4
112.4 mm
mm
wing rods. Doublelong and
and
long
check that the upper
installed
installed
and lower wings
closest
closest to
to the
the
have the same angle
wing
wing tips
tips
of attack. Use the
„wiggle room‟
where each strut
connects to its tab
to fine-tune the fit
of the wing panels
to their center
sections as required.
16. Since the Gotha G.IV will fit in a compact car‟s rear seat, it is not necessary to remove the outer wing panels;
therefore, we recommend gluing the lower wing panels to their nacelles and the upper wing panels to the upper
wing‟s center section. However, if you must be able to remove the outer wing panels: Secure the lower wing
panels to their nacelles with transparent tape and apply transparent tape across the joint formed where the top
wing‟s outer panels meet the upper wing‟s center section – and it will be necessary to install the wing wires.
17. When you are content with the alignment of the wing panels, struts and center sections, securely tighten each nut
onto its 2 mm (1/8-inch) diameter bolt on all the struts. Apply threadlock compound to protect from vibration.
H. FINISHING TOUCHES:
1. Slide each motor box forward or back as necessary to position each
nacelle‟s rear cowl over its motor as shown at the right.
2. Test-fit the propellers and adjust the motor-mounting boxes to provide
approx. 1/4-inch / 7 mm of clearance between the fronts of the propeller
blades and the rear of the cowls.
Copyright 2014 Maxford USA
Page 11 of 18
Rear
cowl
Approx. 1/4-inch
or 7 mm
of clearance
Gotha G.IV heavy bomber / S140919
3. Secure the mounting boxes within their nacelles using glue or by driving
5/16-inch screws through the guide holes on each side of each nacelle as
shown at the right.
4. Being careful to maintain approx. 1/4-inch / 7 mm of propeller clearance, use
transparent tape or 3/8-inch / 1 cm long screws to attach the rear cowls to
their nacelles. (NOTE: You may use the small gaps between the nacelle and
wing panel to help fit the rear cowl to the nacelles.)
5. If both propellers rotate in the same direction, install identical propellers
using the hardware supplied with your motors. If you use counter-rotating
propellers, install a tractor propeller on your left motor (as viewed from the
cockpit) and a pusher propeller on your right motor. Mount both propellers
with their front/curved surfaces toward each
of the motors.
6. As shown at the right, position the front cowls
on the nacelles and allow their magnets to
hold them in position.
7. Guide the straight portion of the tail skid down
into its opening in the bottom of the tail.
8. As shown below, attach the tail skid loosely
to the bottom of the fuselage using two(2)
3/8-inch / 1 cm long wood screws and a metal bracket. (NOTE: Installation of the supplied black string to simulate
the empennage braces is optional, but will certainly enhance the appearance of your Gotha G.IV.)
9. Simulate the empennage braces by wrapping one end of the supplied black string under the tail skid‟s metal
bracket and guiding the string‟s free end through and around the tail section as shown below:
#2
#4
Start & End
the string
under the
metal
bracket
#2
#1
#4
#3
#1
#3
10. Securely anchor the string under the tail skid‟s metal mounting bracket by tightening the two(2) 3/8-inch (1 cm)
long wood screws.
11. Trim the stick-on markings,
then peel and apply as shown
on the following page and
throughout this manual.
Nose windows
Copyright 2014 Maxford USA
Page 12 of 18
Gotha G.IV heavy bomber / S140919
12.
13.
14.
15.
16.
17.
(WING-WIRE NOTE: If the outer wing panels are glued, the wing wires are optional. If the outer wing panels are
not glued, we recommend you install wing wires to help hold the outer wing panels in place.)
Anchor
To simulate the
point E
wing wires
between the
fuselage and the
left nacelle, tie one
Anchor
end of the supplied
point D
black string to the
swivel at anchor
point A as shown
Anchor
at the right.
point B
Anchor
(NOTE: If wing
point G
wires will NOT be
installed, prodeed
to step 27 on
page14.)
Guide the string
along the path
from anchor point
Anchor
A through anchor
point C
point G.
When the string
reaches the swivel
at anchor point G,
Anchor
Anchor
pull the string
point F
point A
„snug‟ and tie it to
the swivel at
anchor point G.
Secure the knots at A and G with CA adhesive and trim off the loose ends.
Simulate the wing wires between the fuselage and the right nacelle by repeating the above steps 12 through
15 in the same (but mirrored) manner.
As shown on the following page, to simulate the wing wires between the left nacelle and the left-side wing struts,
attach a spring to the free end of the swivels at the outside front and outside rear of both the left- and right-side
nacelles. (NOTE: As an option, the springs may be replaced with fishing-tackle clips, not supplied.)
Copyright 2014 Maxford USA
Page 13 of 18
Gotha G.IV heavy bomber / S140919
18. Tie the end of the supplied black string to the free end of this spring (shown as anchor point A in the diagram
below).
19. Guide the string along the path from anchor point A through anchor point H as shown below.
Anchor
point B
Anchor
point F
Anchor
point D
Anchor
point H
Anchor
point A
Anchor
point G
Anchor
point C
Anchor
point E
(NOTE: Anchor points B, C, D, E, F and G are simply the holes in the ends of the struts; there are no swivels.)
20. When the string reaches the end of the spring at anchor point H, pull the string „snug‟ enough to expand the
springs at anchor points A and H to twice their relaxed lengths and tie the string to anchor point H.
21. Secure the knots at A and H with CA adhesive and trim off the loose ends.
22. Tie one end of the supplied black string to anchor point 1 in the diagram below (the free end of the swivel at the
outside rear of the left nacelle).
23. Simulate the remaining left side‟s wing wires as pictured below:
Anchor
point 2
Anchor
point 6
Anchor
point 4
Anchor
point 8
Anchor
point 1
Anchor
point 7
Anchor
point 3
Anchor
point 5
(NOTE: No swivels are used on the struts; anchor points 1 and 8 are the free ends of springs; and anchor points 2,
3, 4, 5, 6 and 7 are simply the holes in the ends of the struts.)
24. When the string gets to the free end of the spring at anchor point 8, pull the string „snug‟ enough to expand the
springs at anchor points 1 and 8 to twice their relaxed lengths and tie the string to the spring at anchor point 8.
25. Secure the knots at 1 and 8 with CA adhesive and trim off the loose ends.
26. Repeat the above steps 18 through 25 in the same (but mirrored) manner to simulate the wing wires on the right
side of the wing‟s outer panels.
Copyright 2014 Maxford USA
Page 14 of 18
Gotha G.IV heavy bomber / S140919
27. Connect the aileron‟s carbon-fiber coupling-rods and EZ-Link connectors to the
ailerons as pictured at the right.
28. While holding each pair of lower and upper ailerons „level‟ (even with their
adjacent wing panels), firmly snug (but do not overly tighten) the EZ-Link
connectors onto their coupling-rods.
29. Ensure the ends of the coupling-rods do not bind against their ailerons: Cut and
discard the excess from the ends of the aileron‟s coupling-rods that extend
excessively beyond their EZ-Link connectors.
30. Use 8 small wood screws to attach the simulated auxiliary fuel tanks to the top
wing as pictured below.
Be careful
to not let
the
couplingrod bind
against
the upper
or lower
aileron.
31. If you install the optional machine guns: Use wood screws to attach the front
machine gun to the base of the front gunner‟s firing ring; attach the rear
machine gun to the deck behind the rear gunner, aligned with the triangular
shaped opening in the top of the fuselage.
32. Use 2 mm bolts and matching nuts to attach the simulated pilot‟s control wheels to both sides of the fuselage as
pictured below. (IMPORTANT: These bolts are located inside the battery compartment; position the heads of
these bolts INSIDE the fuselage with their nuts on the outside.)
Anchor
33. Install simulated control cables at both sides of the fuselage as
point 1
shown at the right or all the way to the tail for simulated elevator
control.
Anchor
point 2
Congratulations!
Assembly is finished!
Copyright 2014 Maxford USA
Page 15 of 18
Gotha G.IV heavy bomber / S140919
VII. SETUP & ADJUSTMENTS
1. Position your LiPo batteries in the fuselage‟s nose compartment, fit
the pegs under the nose-gun mounting ring into their corresponding
openings in the top of the fuselage and ensure this gun mount is wellsecured to the nose by its preinstalled magnets.
2. Center of gravity (CG): For your initial flight your Gotha G.IV
bomber should be balanced when lifted at a point between
2-inches to 2 1/8-inches behind the leading edge of the top wing,
measured where the top wing‟s center section meets the outer panels.
Top wing’s
center section
Outer panel
2-inches to
2 1/8-inches
Trailing edge
When correctly balanced, the airplane will hang level, neither nose up nor nose down.
3. Servo end-point adjustments: For your first flights, set your high rates at the travels listed below and add 30%
expo or set your low rates at 70%.
Control Surface
Recommended Maximum Deflection
a. Elevator .............................. 1/2 inch (13mm)
up and down from center measured at
the elevator‟s outer corners.
b. Ailerons .............................. 5/8 inches (16mm)
up and down from center measured next to the lower ailerons‟
adjoining wing panels.
c. Rudder ................................ 1 inch (25mm)
left and right from center measured at
the rudder‟s top-rear corner.
(NOTE: If you wish to set up differential ailerons, start with UP travel at 5/8 inch and DOWN travel
at 50%; if you employ aileron-rudder mixing, start with a maximim of +25% in both directions –
better yet, if you are flying mode 2, be prepared to make good use of your transmitter‟s left stick.)
4. Check the Mylar covering material‟s joints and surfaces. If necessary, use an iron on medium heat to secure the
edges and to tighten any loosened areas. Recheck and retighten from time to time; be careful to not apply too
much heat as you secure the edges or tighten the Mylar. If any trim becomes loosened, press it down and/or apply
clear tape. Never apply heat to any trim, insignia, marking or plastic part.
5. Ensure the propellers are securely attached to your motors and that each propeller remains undamaged and
correctly balanced.
Copyright 2014 Maxford USA
Page 16 of 18
Gotha G.IV heavy bomber / S140919
VIII. STORAGE, FIELD SETUP
& PREFLIGHT CHECKS
(NOTE: As shown at the right, the Gotha G.IV heavy
bomber will fit in a compact car. Therefore, removing
the wing panels should not be necessary and is not
recommended.)
1. Preparation for transport and storage:
a. Disconnect the springs (or fishing-tackle clips)
and aileron extensions as shown at the right.
b. Slide the outer wing panels off from their wing
rods.
2. Reverse the above procedure to reinstall the outer
wing panels.
Gotha G.IV in the back seat of a compact 4-door sedan
3. Preflight checks:
a. Double-check the security of your motors and propellers.
b. Make sure the front and back cowl structures remain
securely attached to the nacelles. (If in doubt, apply
transparent tape at the sides of each assembly.)
c. Be sure all screws and other connections (both
mechanical and
electrical) throughout the air frame are secure.
d. Always set your transmitter‟s throttle to minimum before
turning ON your transmitter.
e. Double-check control directions of the ailerons, elevator
and rudder.
f. As with all radio-controlled model airplanes, this model
must pass the radio range ground check recommended by
your radio‟s manufacturer or you may not fly safely.
g. Carefully operate your radio-control and power system
according to their manufacturer‟s instructions.
h. Carefully perform whatever additional preflight safety
checks you or your AMA-chartered club may think are
necessary.
CONG RATU LATIONS
ON YOUR NEW
GOTHA G .IV HEAVY BOMBER.
IX. FLYING TIPS
The Gotha G.IV is a heavy bomber and is not designed for aerobatics. During your initial flights we recommend you:
1. Strive for scale-like maneuvers with slow, flat turns.
2. The Gotha G.IV heavy bomber is not intended for aerobatic flying.
3. As always, gently increase the throttle take and off directly into the wind whenever possible.
4. In the air, be careful to maintain reasonable scale-like flying-speeds for all maneuvers; it slows quickly when
power is reduced.
5. When landing, „fly‟ it to the ground with power on (an extended „gliding‟ approach is not recommended).
ENJOY MORE FLYI NG-FUN ONCE
YOU BECOME FAMI LI AR WI TH YOUR
GOTHA G.IV HEAVY BOMBER.
Copyright 2014 Maxford USA
Page 17 of 18
Gotha G.IV heavy bomber / S140919
HAPPY LANDINGS!
Reminder …

This product is NOT a toy.

The quality and capabilities of your finished model airplane depend on how you assemble it.

Your safety depends on how you use and fly it. Any testing, flying and use of this model airplane
is done entirely at your own risk.
PLEASE ENJOY YOUR HOBBY AND FLY SAFELY!
Manufactured by:
Maxford USA RC Model Mfg, Inc.
Distributed by:
Maxford USA RC Model Distribution, Inc.
Telephone (voice) .......................... (562) 529-3988
15939 Illinois Avenue, #B-C
Fax ................................................. (562) 562-6988
Paramount, CA 90723
Toll free (orders only) .................. (866) 706-8288
Website ..........
www.maxfordusa.com
Order replacement parts, optional accessories, brushless motors,
electronic speed controls, servos, and a wide variety of other highquality RC hobby items online at www.maxfordusa.com.
Copyright 2014 Maxford USA
Page 18 of 18
Gotha G.IV heavy bomber / S140919
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