Super Flying Model PIPER CUB J-3 GP/EP User manual

MTH HOBBY PRODUCTS INDUSTRIAL CO., LTD.
www.mth.com.tw [email protected]
MTH HOBBY 2014
SPECIFICATIONS
WING SPAN :1720mm
LENGTH:1095mm
2
WING AREA:42dm
WEIGHT:2300-2600g
RADIO:4 CHANNELS
ENGINE: .46(2C) .56(4C)
Warning
An RC aircraft is not a toy! If misused, it can cause serious bodily
harm and damage to property. Fly only in open areas, following all
instructions included with your radio.
Before beginning the assembly, remove each part from its bag for
inspection. Closely inspect the fuselage, wing panels, rudder and
stabilizer for damage. If you find any damaged or missing parts,
contact the place of purchase.
INSTRUCTION MANUALINSTRUCTION MANUAL
No.867
PIPER J-3
Cub
GP/EP

1
Contents of Kit/Parts Layout
Tools and suppliers needed (not included in kit):
Phillips screws driver #0/#1 / Curved scissors
Hex wrench 1.5/2mm/2.5mm/6mm / Hobby knife / Ruler / Iron / Cross wrench
Pliers / Z-bender / Sanding paper / Epoxy 5-10 minutes / Marker / CA glue
UHU foam glue / Superglue / Cross wrench / Reamer / Solder Iron
Thread lock / Side Cutter / Driller 2mm/6mm / Transparent Tape / Pin
3M fiber tape
Hobby knife
Reamer
Sanding paper
Iron
Ruler
Marker
2
Recommended radio and equipment (not included in kit):
4 channels radio x 1 piece
Receiver x 1 piece
45g servo x 4 pieces
30cm extension x 1 pieces
Switch x 1 piece
Engine: 46(2C)c~56(4C)
Aluminum spinner (for Gas engine)
4.8V battery
Contents of Kit / Parts Layout
For EP:
Motor: 500~680KV
Battery: 2200~3000mAh 4-cell Li-Po
ESC: 50-60A
Propeller: 11x6" ~12x6"
Aluminum spinner (for EP flying)
Place the main wing and hinges on
the working table.
Bend the hinges several times.
Spread the Super glue on the hinges
and insert into the hinges slot on the
main wing and aileron. Apply the
tape to hole the aileron in position
temporary until the glue dry enough.
Try to fit the wing joiner into the main
wing. If too tight, use sand paper to
trim the wing joiner. When satisfy the
assembly, use pencil to mark the
location of the servo try.
Mix 10-min epoxy and spread
generous amount of epoxy on the
wing joiner. Fit the wing joiner into
the main wing. Apply tape on the
conjunction temporary until the
epoxy dry enough.
Take the main wing front planking out
of the wooden hardware bag. Spread
epoxy on the planking and secure on
the main wing.
Place the main wing servo tray on the
working table. Use epoxy to secure
two sides of planking on the tray.

34
Place the servo tray on the center of
the main wing set. Use marker to
mark the location of the servo tray on
the main wing.
Use hobby knife to remove the
covering over the hole.
Use epoxy to secure the servo tray in
position.
Place the servo on the servo tray and
secure it in place with the screws
come with the servo.
Take two pieces of 330mm rods out
of the hardware bag. Use side cutter
to cut all the parts out of the plastic
parts tree. Screw a clevis onto the
threaded end of each rod. Thread the
aileron horns onto the aileron torque
rods in the wing until the rod is flush
with the aileron horn. Attach the
clevises onto their respective aileron
horns. Center the aileron servo and
using marker to place a mark on the
unthreaded end of the aileron
pushrods where they pass their
respective servo arm.
Using z-bend pliers, make a z-bend
at the marked location on each rod
and cut off the excess rod.
Use 2mm reamer to enlarge the hole
on the servo arm. Place a piece of
fuel tubing over the clevises.
This will provide extra insurance
against the clevises accidentally
coming open. Install the z-end into
the hole of the servo arm. Adjust the
aileron torque rod length by screwing
in or out until the aileron is exactly in
the neutral position when the servo is
centered and clevis is in the aileron
horn. Adjust both sides.
Find the pre-serving opening on both
sides of the fuselage for assembling
windows. Use hobby knife to remove
the covering over the openings.
Please reserve 6mm covering on the
edges of the openings.
O
Use iron (140 C) to trim the edges
and use hobby knife to remove the
excess covering.
Place the window set on the working
table and use curved scissors to
remove window from the window set.
Please reserve 6mm on the edges.
Spread UHU glue along the edges of

65
Place the yellowing covering and
main gear planking on the working
table. Iron on the covering onto the
main gear planking.
Iron on the covering onto the wing
struts and the triangle reinforcing
planking.
Iron on the covering onto the front
edge of the main wing.
Place the black covering, decorative
muffler and spring on the working
table. Iron on the black covering onto
the muffler and spring. Please note
there is a hole on the center part of
the spring. Use reamer to re-open
the hole after ironing.
Find a long trip of yellow covering in
the hardware bag. Iron on the
yellowing covering onto the
conjunctions.
Try to fit two struts together and use
hobby to remove the covering on the
conjunctions.
Use epoxy to glue the struts together
and use tape to secure the struts
temporary.
Spread generous super glue on the
hinges and insert the hinges into the
rudder until the hinge line is even with
the leading edge of the rudder. Place
the rudder onto the vertical stabilizer.
Place the horizontal stabilizer on the
working table. Use ruler to mark the
center line on the stabilizer. Place the
fuselage on the stabilizer. The center
line of the fuselage must meet the
center line on the stabilizer. Use 3
pieces of needle to fix the stabilizer
on the fuselage.
Use a pencil to carefully trace around
the bottom and the top of the
stabilizer where it meets the fuselage.
Remove the fuselage.
Use a straight ruler to mark the area
inside the line.
Using a hobby knife carefully cut
away the covering inside the lines
marked above. Be carefully not to cut
into the wood as doing so will weaken
the structure.
window set and secure on the
fuselage. Apply tape on the window
set for holding it in place until the
glue is dry enough.
130 mm
60.2 mm
12 mm
O
18.5

78
Spread generous super glue on the
hinges and insert the hinges into the
elevator. Place the elevator onto the
horizontal stabilizer.
Take 6mm dowels out of the
hardware bag. Use sand paper to
sand both ends for making 1mm 45
degree angle.
Place the main wing onto the
fuselage and secure in place with
4x40mm screws and washers. Use
6mm driller to open the hole on the
planking, depth is around 15mm.
Spread some epoxy on half of the
dowel and insert into the main wing.
Place the tail wheel and 2mm collar
onto the tail gear and secure with
3x5mm screw.
Use ruler to mark a position on the
rudder. It is 35 mm from the bottom.
Use a sharp hobby knife to open a V
slot (depth: 2mm) on the marked
position.
Use 2mm driller to drill a hole on the
marked location for accepting the tail
wheel guide wire.
Spread some epoxy into the hole for
securing the tail wheel guide wire
inside the rudder.
Use hobby knife to remove the
covering on the bottom of the vertical.
Apply some epoxy the vertical and
horizontal where they come in
contact with the fuselage. Assemble
the vertical and horizontal on the
There is a gap between vertical and
horizontal on both sides. Try to fit the
triangle reinforcement into the gap.
Please note it must fit perfect. If not,
use sand paper to trim the edges of
the reinforcement. When satisfy the
location, use pencil to mark the
outline on the vertical and horizontal.

9 10
Use 2.6x 10mm tapping screw to
secure the tail wheel assembly in
location.
Take dowels, clevis and heat shrink
tubing out of the hardware bag. Take
a rod of 5mm. Use plier to make a
90 degree bend on no threaded end.
Insert the 90 degree bend into the
Hole of the wood dowel. Slide a piece
of heat shrink tubing over each end
of the wood dowel and shrink it in
place using a heat gun.
Carefully cut away the covering on
the top left side of the fuselage next
to the vertical fin for the rudder and
the right side for the elevator this is
where the pushrods will exit. Position
the assembled pushrods through the
fuselage to the exit. Slide a piece of
fuel tubing and screw the clevis on
the end of the pushrod.
Install the control horns on the
elevator an rudder. When installing
the control horns, it is important that
the holes in the control horns, where
the pushrod attaches are directly in-
line with the control surface hinge
line. Use 2mm driller drill hole.
Secure the control horns and plate in
place with 2 x 15mm screws.
Using Z-bend pliers, make a Z-bend
at the marked spot on the rod. Use
2mm driller to open a hole on the
servo arm. Insert Z-bend into servo
arm and secure with screw. Slide the
fuel tubing to the clevis.
Take the motor mount planking out of
Find two planking that has the same
shape. Use epoxy to glue them
together. Use ruler to mark a cross
on the planking.
Assemble the planking into the motor
mount. Use epoxy to secure the
planking in place.
Try to fit the motor on the motor
mount. Secure the motor cross plate
(come with the motor) on the motor
planking with the screws come with
Using a 90 degree triangle, make
sure that fin is perpendicular to the
horizontal stabilizer.
fuselage. Use needle or tape to hold
the vertical in place until it's
completely dry.
O
90
Install the servos on the servo tray
and secure with the screws which
are included with the servo. Secure
the servo tray with epoxy. Center the
servo. Using marker to mark the rod
where it passes the respective servo
arm.
160
165
165 150
150
the hardware bag and place on the
working table.

11 12
Use epoxy to secure the motor
mount on the fire wall.
Secure the motor assembly on the
motor mount with 3x10mm tapping
screws.
Take the eyelets and wire out of the
hardware bag. Use nipple pliers to
cut the following sizes of wires:
220mm x 2 pieces for installing the
decorative spring on the main gear.
205mm x 2 pieces for installing on
the top of horizontal.
180mm x 2 pieces for installing on
the bottom of horizontal.
Insert the end of the wire into the
conjunction of eyelet. Use nipple plier
to clamp down the conjunction. Drop
some instant glue on the conjunction.
Try to locate the wire assembly on
the top of horizontal. One end is
9.5mm from the top of the vertical.
The other end is 5mm from the read
edge of the horizontal. Please pull
the wire straight and use screw and
washer to fix it in place temporarily.
Don't screw too tight.
Screw one end of 180mm wire to the
bottom of the horizontal and the
other end to the tail gear.
Check all the wires. They must be
bilateral symmetry. Screw the screws
and washers tight to secure the wires
in place.
Use curve scissors to trim the
canopy according the molding line.
Try to fit the canopy on the fuselage.
Use marker to mark the position
around 7-8mm from the bottom of
the canopy. Use reamer to drill a
5mm hole. Repeat the same
procedure on the other side of
canopy.
Insert the black rubber ring into the
canopy. Please note the canopy
must fit into the slot around the
rubber ring. It will be easier if drop
some water on the ring.
Insert the black rubber ring into the
eye screw. Drop some instant screw
on the conjunction.
Find a location on the side fuselage.
It's 48mm from the gear slot and
8mm from the bottom of the fuselage.
Use 1.5mm driller to drill a hole on
this location. Screw in the eye screw.
motor. The length of the motor
assembly can be adjusted by
increasing or decreasing the wooden
spacers.

13 14
Insert one piece of hook-and-loop
strap through the battery tray. Apply
one side of Velcro (peel and stick
adhesive) on the battery tray.
Apply another side of Velcro on the
battery. Place the battery on the
battery tray and secure in place with
hook-and-loop strap.
Place the canopy on the fuselage.
Apply a piece of tape to fix it in place
temporarily. When satisfy the
location, use a marker to make a
mark on the center of the rubber ring.
Remove the canopy. Use 2mm driller
to drill hole on the marked position.
Take M2x15mm screws, washers and
nuts out of the hardware bag. Insert a
washer to the screw. Place the screw
inside the fuselage and insert through
the fuselage and canopy. Use washer
and nut to secure it in place. Press
the rubber ring onto the end. It's
convenient for removing the canopy
and changing the battery.
Find the pre-served gear slot on the
bottom of fuselage. Use hobby knife
to remove the covering on the slot.
Take one piece of heat shrink tubing
out of the hardware bag. Cut the
tubing into 5mm x 8 pieces. Please
refer to the drawing and note the
location for placing the tubing. After
heating the first tubing, move the
second tubing to over the first tubing
and heating again. You can use
lighter, heat gun to heating the shrink
tube.
Assemble the wheels on the main
gears and secure with 4mm collar and
M3x5 screws.
Use sharp hobby knife to remove the
planking on the cooling hole.
Try to fit the main gears into the gear
slot and secure with gear plate and
2.6 x 10mm tapping screws.
Try to fit the decorative planking on
the main gear. Place a saddle cable
clip on the main gear where has heat
shrink tubing. Use 2.6 x 8mm tapping
screw to secure the planking on the
gear.
Secure two hinges on the read edge
of the gear planking with 2x5mm
tapping screws.
35 mm
35 mm
The other side of tape must be press
down to fuselage.

Apply one piece of 30mm 3M fiber
tape on the front edge of canopy.
15 16
Use hobby to remove the covering
over the vent.
Assemble the motor with propeller
and aluminum spinner. Please note
there is 1.5mm space between
aluminum spinner and cowling. Try
to fit the cowling on the fuselage.
When satisfy the location, apply a
piece of tape to hole the cowling in
place. Use 1.5mm driller to drill hole
for fixing the cowling on fuselage.
Use 2x8mm tapping screws to
Sprinting black on the decorative
plastic engine.
Paint silver on the top of plastic
engine.
Use curve scissors to trim the edges.
Sand the bottom side.
Spread epoxy to secure the plastic
engine on two sides of cowling. (It's
only one side for GP version.)
Place the main wing on the fuselage.
Screw in the M4x40mm wing bolts.
Cut the hinges into two halves. Place
one halve on the wing struts. Mark
the position for fixing the hinges on
the struts. Drill 1.5mm hole on the
marked position.
Use 2x5mm tapping screws to
secure the hinges on the struts.
Place the wing struts to the fuselage.
Please refer to the picture. The eye
screw must be fitted into the slot and
fixed with R pin.
secure the cowling in palce.
Please refer to the drawing and find
the blocks inside the main wing for
fixing the struts. Place the struts on
the main wing and mark the position
for hinges. Drill 1.5mm holes on the
marked positions.
15
80

17 18
Install the propeller and secure the
aluminum spinner.
Use 2x8mm tapping screws to
secure the hinges in place.
Secure one end of gear wire on the
gear fixing plate with 2.6 x 8mm
tapping screw. Secure the other end
to the gear planking around 7mm
from the front edge. Don't pull the
wire too tight.
FOR GP VERSION
Take the servo tray out of the
hardware bag. Place 3 pieces of 45g
servos on it and secure with the
screws come with the servos. The
left servo is for throttle. The top on
the right side is for elevator, the
bottom is for rudder.
Connect the servo with receiver. Set
the horizontal and vertical to neutral
position and use clip to hole them in
place. Pull the pushrod to the outer
hole of servo arm. Using a marker to
place a mark on the end of the
pushrod where it passes the
connection hole of servo horn. Using
Z-bend pliers, make a Z-ben at the
marked location on the rod. Insert the
Z-bend into the servo arm. Adjust the
clevis and slide the fuel tube into the
rod.
PS:Use epoxy to secure the servo
tray on the planking.
Apply one side of adhesive Velcro on
the fuel tank and another side on the
battery tray. Connect the fuel tank
and pressing hole with fuel tubing.
Pull the fuel tube out of the fire wall.
The opening for the switch is on the
left side. Secure the fuel tank on the
battery tray with a hook-and-loop
strap.
Set the engine mount to 45 degree
and secure on the fire wall with
M4 x 30mm screws.
Place the engine on the engine
mount. Secure the engine in place
with engine mounting brackets,
M4x30mm screws and nuts. Connect
with throttle rod. Secure the muffler.
Install the fuel tube from the fuel tank
pickup line to the carburetor fuel
nipple. The vent line will be installed
onto the pressure nipple after the
muffler is installed.
Try to fit the cowling on the fuselage.
Use hobby knife to trim the opening
for the engine. Please keep 1.5mm
space between the cowling and
engine mounting brackets. Apply
tape to fix the cowling in place
temporarily. Use 1.5mm drillers to
drill holes on the cowling. Secure
cowling in place with 2x8mm tapping
screws. Remove the tape.
(You may apply tape around the
canopy for avoiding the oil during
flying.)

19
15mm
15mm
15mm
15mm
35mm
35mm
20
80~90mm
The C.G. Point is 80~90mm back
from the leading edge against the
fuselage.