SG Models PIPER CUB User manual

MadeinVietnam.
“Graphics and specifications may change without notice”.
Kit features.
• Ready-made—minimalassembly&finishingrequired.
• Ready-coveredcovering.
• Photo-illustratedstep-by-stepAssemblyManual.
Specifications
Wingspan----------------------------------------88.2in----------------------------224cm.
Wing area--------------------------------------- 1137.1 sq.in--------------- 73.4 sq.dm.
Approximate flying weight--------------------9.95- 11 lbs------------------4.5 - 5kg.
Length---------------------------------------------56.2in--------------------------142.7cm.
Recommended engine size---------------- 20-26cc.
-----------------------------------------------------1.2-1.5 4-stroke engine.
Radio System required 4 channels with 6 servos
Flying skill level Intermediate/advanced.
ASSEMBLY MANUAL
MS: 74

PIPER CUB_ CODE SEA 74. Instruction Manual
2
INTRODUCTION.
Thankyou for choosingthe PIPER CUB ARTFby SG MODELS. The PIPER CUB was
designed with the intermediate/advanced sport scale in mind. It is a semi scale airplane which is
easytoflyandquicktoassemble.Theairframeisconventionallybuiltusingbalsa,plywoodtomake
itstrongerthantheaverageARTF,yetthedesignallowstheaeroplanetobekeptlight.Youwillfind
thatmostoftheworkhasbeendoneforyoualready. Themotormounthasbeenfittedandthehinges
are pre-installed . Flying the PIPER CUB is simply a joy.
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your PIPER CUB. Use the parts listing below to
identify all parts.
WARNING.
Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it
is capable of causing injury to people or property. WHEN YOU FLY THIS AEROPLANE YOU
ASSUME ALL RISK & RESPONSIBILITY.
If you are inexperienced with basic R/C flight we strongly recommend you contact your R/C
supplierandjoinyourlocalR/CModelFlyingClub.R/CModelFlyingClubsofferavarietyoftraining
proceduresdesignedtohelpthenewpilotonhiswaytosuccessfulR/Cflight. They will also be able
to advise on any insurance and safety regulations that may apply.
ADDITIONAL ITEMS REQUIRED.
.1.2-1.5 4-stroke engine
.91 - 1.2 cu.in 2-stroke
6 servos
Glow plug to suit engine
Propeller to suit engine
Protective foam rubber for radio
system
Silicone fuel line
TOOLS & SUPPLIES NEEDED.
Thick cyanoacrylate glue
30 minute epoxy
5 minute epoxy
Hand or electric drill
Assorted drill bits
Modellingknife
Straight edge ruler
2mm ball driver
Phillips head screwdriver
220 grit sandpaper
90° square or builder’s triangle
Wire cutters
Masking tape & T-pins
Thread-lock
Paper towels
PARTS LISTING.
FUSELAGE ASSEMBLY
(1) Fuselage
WING ASSEMBLY
(1) Right wing
(1) Left wing
(1) Aluminium dihedral brace
Tail section assembly
(1) Horizontal stabilizer/ elevator
halves.
(1) Rudder halves.
Some more parts.
HARDWAREPACK
COWLING
Landinggear.....

3
1) Carefully remove the aileron from one
of the wing panels. Note the position of the
hinges.
2)Removeeach hinge from thewingpanel
and aileron and place a T-pin in the center of
each hinge. Slide each hinge into the wing
panel until the T-pin is snug against the wing
panel. This will help ensure an equal amount
ofhingeison either side ofthehingelinewhen
the aileron is mounted to the aileron.
3) Slide the wing panel on the aileron until
there is only a slight gap. The hinge is now
centered on the wing panel and aileron.
Remove the T-pins and snug the aileron
against the wing panel.A gap of 1/64” or less
shouldbe maintained betweenthe wing panel
andaileron.
The control surfaces, including the
ailerons, elevators, and rudder, are
prehinged with hinges installed, but the
hinges are not glued in place. It is
imperativethat youproperly adhere the
hingesin placeper the steps that follow
using a high-quality thin C/A glue.
Note:
4)Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
aileronsfrontsurfaceshould lightly contactthe
wing during this procedure. Ideally, when the
hinges are glued in place, a 1/64” gap or less
will be maintained throughout the lengh of the
aileron to the wing panel hinge line.
Note: The hinge is constructed of a special
material that allows the C/A to wick or
penetrateanddistributethroughout the
hinge, securely bonding it to the wood
structureof the wingpanel and aileron.
To avoid scratching your new aero-
plane we suggest that you cover your work-
benchwith an oldtowel. Keepa couple ofjars
orbowlshandytoholdthesmallpartsafteryou
open the bags.
Pleasetrialfitallparts.Makesureyouhavethe
correct parts and that they fit and are aligned
properlybeforegluing!Thiswillensureproper
assembly as the PIPER CUB is made from
natural materials and minor adjustments may
havetobemade. Thepaintandplasticparts
usedinthiskitarefuelproof.However,theyare
not tolerant of many harsh chemicals includ-
ingthefollowing:paintthinner,cyano-acrylate
glueaccelerator,cyanoacrylategluede-bonder
andacetone.Donotletthesechemicalscome
incontactwiththecoloursonthecoveringand
the plastic parts.
NOTE:
HINGING THE AILERONS.
Hinge.
T- pin.
Hinge.
T- pin.
C/Aglue.

PIPER CUB_ CODE SEA 74. Instruction Manual
4
HINGING THE ELEVATOR.
8)After both ailerons are securely hinged,
firmly grasp the wing panel and aileron to
make sure the hinges are securely glued and
cannot be pulled out. Do this by carefully
applying medium pressure, trying to separate
the aileron from the wing panel. Use caution
not to crush the wing structure.
7) Repeat this process with the other wing
panel, securely hinging the aileron in place.
HINGING THE RUDDER.
Glue the elevator hinges in place using the
same techniques used to hinge the ailerons.
Glue the rudder hinges in place using the
same techniques used to hinge the ailerons.
Work the aileron up and down several
times to “work in” the hinges and check
for proper movement.
Note:
5)Turn thewing paneloverand deflect the
aileron in the opposite direction from the
opposite side. Apply thin C/A glue to each
hinge,makingsurethat the C/Apenetratesinto
both the aileron and wing panel.
6) Using C/A remover/debonder and a
papertowel, remove anyexcessC/A gluethat
may have accumulated on the wing or in the
aileronhinge area.
Aileron control horn: See pictures below.
AILERON CONTROLHORN
Hinge.
2 sets.
3x40mm.
M3LOCK
NUT.
ALUMINUMWASHER.
ALUMINUMWASHER.
CONTROLHORN
M3 SCREW.
16mm.
Epoxy.
Wing
Epoxy.
Wing

5
ELEVATOR CONTROL HORN.
Install the elevator control horn using the
same method as with the aileron control
horns.
2 sets.
3x35mm.
Aluminum Washer.
16mm.
CONTROL HORN M3
M3LOCKNUT.
Epoxy.
Epoxy.
Aluminum Washer.
Wing. Aileron.
Horizontal
Stabilizer.
Horizontal
Stabilizer.
16mm.
Rudder control horn:
Using the same techniques used aileron
control horn. See picture below.
2 sets.
3x35mm.
EPOXY.
Rudder.
FUSELAGE.
RUDDER CONTROL HORN.
Elevator control horn.
CONTROL HORN
M3 SCREW.
M3 LOCK NUT.
ALUMINUMWASHER.
EPOXY.
FUSELAGE.
ALUMINUMWASHER.
Rudder.

PIPER CUB_ CODE SEA 74. Instruction Manual
6
See pictures below.Make yourself the
template of your engine on paper.
ENGINE MOUNT INSTALLATION.
Mark and drill 4 holes for engine mount.
Insert 4 blind nuts to firewall.
4x30mm.
Thread locker glue.
Ruddercontrolhorn. 
ofsiliconfuel line. Connectoneend of theline
tothe weighted fuel pick up andthe otherend
to the nylon pick up tube.(The silicon tube is
not included).
3) Carefully bend the second nylon tube
up at a 45º angle. This tube is the vent tube.
1) Using a modeling knife, carefully cut
off the rear portion of one of the 3 nylon tubes
leaving 1/2” protruding from the rear of the
stopper. This will be the fuel pick up tube.
INSTALLING THE STOPPERASSEMBLY.

7
4) Test fit the stopper assembly into the
tank. It may be necessary to remove some of
the flashing around the tank opening using a
modeling knife. If flashing is present, make
sure none falls into the tank.
5) With the stopper assembly in place,
the weighted pick-up should rest away from
therear of the tank and move freely insidethe
tank. The top of the vent tube should rest just
below the top of the tank. It should not touch
the top of the tank.
Important: When the stopper assembly is in-
stalled in the tank, the top of the vent tube
should rest just below the top surface of the
tank. It should not touch the top of the tank.
Carefully use a lighter or heat gun to
permenently set the angle of the vent tube.
6) When satisfied with the alignment of
the stopper assembly tighten the 3 x 20mm
machine screw until the rubber stopper ex-
pands and seals the tank opening. Do not
overtighten the assembly as this could cause
the tank to split.
FUEL TANK INSTALLATION.
You should mark which tube is the vent
and which is the fuel pickup when you
attach fuel tubing to the tubes in the stopper.
Once the tank is installed inside the fuselage,
it may be difficult to determine which is which.
Venttube. Fuel pick up tube.
Fuel fill tube.
Blow through one of the lines to ensure
thefuel lines have not becomekinked in-
side the fuel tank compartment. Air should
flowthrough easily.
Fuel pick-up tube.
Fuelfill tube.
Vent tube.
Rubber band.
Fueltank.
LANDING GEAR INSTALLATION
M3x4mm.
Please see below pictures.

PIPER CUB_ CODE SEA 74. Instruction Manual
8
3 x12mm.
3 x15mm.
3 x15mm.

(6mm)
1/4 inch
3 x12mm.
9

PIPER CUB_ CODE SEA 74. Instruction Manual
10

11
4) Remove the engine. Using an drill bit,
drill the mounting holes through the engine
mount at the four locations marked.
 2) Place your engine onto the engine
mount. Adjust the engine is centered of the
edges of the engine case.
 3) When you are satisfied with the align-
ment, mark the locations of the engine
mounting.
1) Install the pushrod housing through the
predrilledholein the firewallandintothe servo
compartment. The pushrod housing should
protrude 1/4" out past the front of the firewall.
MakeaZ-Bend 1/4" fromoneend of theplain
wire pushrod.
MOUNTING THE ENGINE.
4.2 mm diameter.
155mm
.COWLING INSTALLATION.
1) Slide the fiberglass cowl over the en-
gineandline up thebackedge of thecowlwith
themarks youmade on thefuselage thentrim
and cut.

6) Attachthe Z-Bendin the pushrodwireto
the throttle arm on the carburetor.

5) Bolttheenginetotheenginemountusing
the four machine screws. Double check that
all the screws are tight before proceeding.
MachineScrew 4x30mm.
Trim and cut.
MachineScrew 4x30mm.
Pushrodwire.

PIPER CUB_ CODE SEA 74. Instruction Manual
12
Trim and cut.
Trim and cut.
Trim and cut.
2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwiththecrankshaftoftheengine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening.Usethespinnerbackplateas a guide.
Hold the cowl firmly in place using pieces of
masking tape.
Becauseof the sizeof the cowl,itmay benec-
essaryto usea needle valveextension forthe
highspeedneedle valve. Make thisoutof suf-
ficient length 1.5mm wire and install it into the
end of the needle valve. Secure the wire in
placeby tightening theset screwin the sideof
the needle valve.
3) Installthemufflerandmufflerextension
onto the engine and make the cut out in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
and fuel filler valve. Secure the cowl to fuse-
lage using the 3x10mm screws (4).
MachineScrew 3x10mm.
1.5mmwere
(needlevalve).

ELECTRIC POWER CONVERSION.
1) Locate the items neccessary to install
the electric power conversion included
with your model.
2) Recommend the items necessary to in-
stall the electric power conversion parts
included with your model.
- Motor: 90 - 1800 Watts
- Propeller: 16x8 ~ 18x8
- ESC: 85A
- 6S- 8S Lipo
3) Attach the electric motor box to the
rewall suitable with the cross lines
drawn on the electric motor box and re-
wall. Using epoxy and balsa stick to se-
cure the motor box to the rewall. Please
see pictures below.
4) Attach the motor to the front of the
electric motor box using four 4mm blind
nut, four M4x20mm hex head bolts to se -
cure the motor. Please see picture shown.
M4x20mm and washers.
en, use 5.5mm drill bit to enlarge the
holes on the electric motor box.
4mm.
5.5mm.
13

Blind nut.
155mm.
Epoxy.
Epoxy.
5) Attach the speed control to the side
of the motor box using two-sided tape
and tie wraps. Connect the appropriate
leads from the speed control to the mo-
tor. Make sure the leads will not interfere
with the operation of the motor.
Battery.
M4x20mm.
Balsa stick.
Speed control.
PIPER CUB_ CODE SEA 74. Instruction Manual
14

INSTALLING THE SPINNER.
Install the spinner backplate, propeller
and spinner cone.
Nylon 4x25mm.
e propeller should not touch any
part of the spinner cone. If it does, use a
sharp modeling knife and carefully trim
away the spinner cone where the propel-
ler comes in contact with it.
15

INSTALLING THE SWITCH.
Installthe switch intotheprecut holeinthe
side of fuselage.
Switch.
THROTTLE SERVO ARM INSTALLATION.
 2) Secure the servos with the screws pro-
vided with your radio system.
1) Installthe rubbergrommets and brass
colletsonto the throttleservo. Testfit the servo
into the aileron servo mount.
Throttleservo.
Elevatorservo.
Elevatorservo.
Rudderservo.
Throttleservoarm.
Elevatorservo.
Elevatorservo.
Rudderservo.
Install adjustableservoconnectorinthe servo
arm .
INSTALLING THE FUSELAGE SERVO.
Because the size of servos differ, you
mayneedtoadjustthesizeofthe precut open-
ing in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
AdjustableServo
connector.
Servoarm.
Loctite secure.
1 pcs.
Draw center line.
INSTALLING THE HORIZONTAL
STABILIZER.
16
PIPER CUB_ CODE SEA 74. Instruction Manual

Remove covering.
When cutting through the covering to re-
move it, cut with only enough pressure
toonly cut through the covering itself. Cutting
into the balsa structure may weaken it.
pen.
Epoxy
Remove covering.
Pen.
When cutting through the covering to re-
move it, cut with only enough pressure
toonly cut through the covering itself. Cutting
into the balsa structure may weaken it.
Hingeslot.
INSTALLING THE VERTICAL STABILIZER.
17

C/Aglue.
Hinge.
90º Vertical
Stabilizer.
Horizontal
Stabilizer.
Putthe vertical stabilizerinto the inthe top
of the horizontal fin. The bottom edge of the
stabilizershouldalso befirmlypushed against
the top of the horizontal stabilizer.
INSTALLING THE AILERON SERVOS.
String.
Small weight.
Servos. Smallweight.
Thread.
Epoxy.
Attach the string to the servo lead and carefully thread it though the wing.
String. Small Weight.
Wing. Wing rib.
String.
Small Weight.
Servo electric wire.
Aileron
Servo.
18
PIPER CUB_ CODE SEA 74. Instruction Manual

INSTALLATION THE PUSHROD.
Wing. Aileron.
Aileron.
Aileron.
M2 lock nut.
M2clevis.
75mm.
110mm.
ELEVATOR - RUDDER PUSHROD
INSTALLATION.
Repeat the procedure for the other wing. Elevator control horn.
Rudder control horn.
Wing.
Aileron.
M2lock nut.
19

Elevator and rudder pushrods assembly follow pictures below.
Attach to servo arm in fuselage. Attach to elevator - rudder control horn.
Throttle. Elevator.
Rudder.
M2 Lock nut.M2clevis.
20
PIPER CUB_ CODE SEA 74. Instruction Manual