General Hobby Piper J3 User manual

Piper J3
Assembly Manual
Color Y Color W
Color R

Caution!
You should not regard this plane as a toy!
To ensure safety, please read this instruction manual thoroughly
before assembly.
Building and operating a model plane requires diligent practice and
correct guidance. An inexperienced flyer can cause serious injury
and property damage.
Seek the assistance of an experienced RC pilot or model airplane
club for help with assembly, operation and maintenance to ensure
your flying experience is both enjoyable and safe.
Fly only in AMA (Academy of Model Aeronautics) approved areas.
Approved areas or areas approved by the Model Association of
your country.

Main wing assembly
Attn:

Put the servo into servo hole. Drill holes for servo mounting screws.
Install servo with servo mounting screws. Repeat servo installation
process for all aileron and flap servos.
Install the control horn.
Adjust the horn and servo arm. Fix the horn in place firmly. Install the
ball link and push rod . Make sure it’s firm and flexible. (we have the
Turnbuckle wrench available separately. Please contact the distributor
to get the quote.)
Repeat the previous steps for the other wing. Please install the wing
tube and wing bolts in the final assembly.
Do the same on the elevator and rudder

Strut assembly and installation

Find out the strut parts. Assemble them as shown.
Lock the strut onto the wing with screws.

Main Landing Gear
Find out the pressures for the landing gear install.
Screw the landing gear onto the fuselage with pressers.
Install the wheels between to wheel collars.

Tail wheel Unit
Drill a hole and make it fit the steering tube. (Do not glue it into
position untill the tail wheel installation step is completed.)

Assembled photo for the tail wheel parts.
Use the tail wheel bracket as a template and drill holes for the
mounting bolts.
Install the blind nuts through the openning in the rear of the
fuselage.
Attach the tail wheel bracket and secure the bolts with Blue
Loctite.
Insert the steering arm into the rudder steering tube and position
the tube ready for gluing. Tighten the set nuts.
Epoxy the steering tube in place as shown.

Rudder Installation
Find out the slot pre-opened for rudder control horn, remove the film
Fit the control horn into the slot, measure the correct length for it
Cut the longer part. Glue the horns into the rudder of each side
Repeat the same method on the other side of the rudder.
Thread the cable connecter halfway into the ball link .
Connect the pull-pull wire and control horn with ball link
Drill holes for the mounting screws. Fit the servos as shown with the servo
label facing the rudder. Harden the area around the holes with a
drop of thin CA.
Use brass crimps on each cable and thread, the cable through the end of the
pullpull connector.
Crimp the brass tube with a crimping tool or pliers
A drop of thin CA may be applied to the brass tube to help secure the cable
Install the rudder ball links with bolts and locking nuts.
Check the pull-pull cables.
Rudder and the rudder servo should both be in the neutral position.

Stab and Elevator installation

Cut out the holes on the elevator
Mount bottom wing to fuselage. Slide the stab through the pre cut
stab slot at the rear of the fuselage.
Center stab in fuselage
Align stab to wing. Ensure all dimensions are equal for both left and
right sides.
Make alignment marks on stab for easy realignment during the gluing
process.
Glue stab into fuselage. Be certain to put glue onto both the top and
bottom sides of the stab.
Double check all measurements are equal and stab is properly
positioned before glue dries.

Stab servo and Rudder servo Installation
Connect the control horn, pushrod, and ball links.

Put the control horn into the slot, glue it to the stab on each side
Cut out the servo holes in each side of the fuselage tail. Then fix them
up as shown
Engine Installation
Pre-marked holes for the engine, and also there is center line for you to
measure if your engine is fit for the screw holes or not.
Insert the bolts through flat fender washers, the firewall and into the engine
stand offs. Tighten firmly. Secure mounting bolts nuts with Blue Loctite.
Use a bit to drill a pushrod exit hole on the firewall in line with the engine
carburetor throttle arm.
Attach the ball link to the throttle pushrod and secure to the carburetor
throttle
arm with a bolt and nylon lock nut.
Insert the throttle servo into the servo mounting tray with an output arm
forward. Insert the throttle pushrod into the servo arm easy link.
Mark a line for the throttle servo tray, then glue it to the fuselage.
Use a drill to drill the servo mounting holes. Install the servo with servo
screws.
Insert the throttle pushrod into the servo easy link. Move the servo arm to
the center position. So that carburetor is half open. Tighten the easy link set
screw.

Fuel Tank
Install the inside parts of fuel tank as shown.
Assemble the outside fuel pipe as shown.
Tighten the velcro ties secure the fuel tank.

Stairs
Find out the stairs and the self-tapped screw.
Lock the stairs onto the wings at back side.

Windows and doors
Find out the doors and windows
Install the hinges and the locks as shown