GREAT PLANES Piper J-3 Cub Instruction Manual
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GREAT PLANES Piper J-3 Cub Instruction Manual

Quarter scale
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Great Planes Model Manufacturing Co. guarantees this kit to be free from defects in both material and workmanship
at the date of purchase. This warranty does not cover any component parts damaged by use or modification. In no case
shall Great Planes' liability exceed the original cost of the purchased kit. Further, Great Planes reserves the right
to change or modify this warranty without notice.
In that Great Planes has no control over the final assembly or material used for final assembly, no liability shall be
assumed nor accepted for any damage resulting from the use by the user of the final user-assembled product. By the act
of using the user-assembled product, the user accepts all resulting liability.
If the buyers are not prepared to accept the liability associated with the use of this product, they are advised
to return this kit immediately in new and unused condition to the place of purchase.
READ THROUGH THIS INSTRUCTION MANUAL
FIRST. IT CONTAINS IMPORTANT INSTRUCTIONS
AND WARNINGS CONCERNING THE ASSEMBLY
AND USE OF THIS MODEL.
GPMZ0215 V1.0
Q Q U U A A R R T T E E R R

INSTRUCTION MANUAL

S S C C A A L L E E
WARRANTY
P.O. Box 788
A.R.F.
Almost Ready to Fly
Urbana, IL 61801
productsupport@greatplanes.com
Entire Contents © Copyright 1999
(217) 398-8970

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Summary of Contents for GREAT PLANES Piper J-3 Cub

  • Page 1: Instruction Manual

    In that Great Planes has no control over the final assembly or material used for final assembly, no liability shall be assumed nor accepted for any damage resulting from the use by the user of the final user-assembled product. By the act of using the user-assembled product, the user accepts all resulting liability.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS PROTECT YOUR MODEL,YOURSELF & OTHERS...FOLLOW THIS Important Safety Precautions ....2 IMPORTANT SAFETY PRECAUTION Introduction ....... . . 3 Decisions You Must Make .

  • Page 3: Introduction

    ❏ 8-32 Tap & #29 Drill Bit (GPMR8103) Building Supplies and Tools INTRODUCTION The Great Planes Piper Cub ARF is an easy-to-fly These are the building tools that are required. We recommend ™ sport-scale airplane that closely resembles the full size Great Planes Pro CA and Epoxy glue.

  • Page 4: Optional Supplies And Tools

    Optional Supplies and Tools ❏ CG Machine ™ (GPMR2400) ❏ Dremel ® ™ MultiPro Or Similar W/Cut-Off Wheel ❏ Dead Center ™ Engine Mount Hole Locator (GPMR8130) ❏ Groove Tube ™ Grooving Tool (GPMR8140) ❏ Curved Tip Canopy Scissors (HCAR0667) ❏...

  • Page 5: Parts List

    Key# Description Parts Not Shown In Photo Fuselage ....1 Left Wing Panel w/Aileron ..1 Description Right Wing Panel w/Aileron ..1 Adjustable Engine Mount .

  • Page 6: Begin Construction

    BEGIN CONSTRUCTION Fuelproof the Fuselage ❏ 1. Coat the firewall and all other bare wood around the firewall with fuelproof paint or 30-minute epoxy thinned with alcohol. Fuelproof other areas of bare wood in the fuselage that may be exposed to fuel or engine exhaust, such as the fuel tank area and the front and back of the wing saddle.
  • Page 7 ❏ 6. Position the engine on the engine mount rails so the propeller thrust washer is 5-1/4" [133mm] ahead of the firewall. Use a Great Planes Dead Center Hole Locator (GPMR8130) (not included) or a sharpened piece of wire to scribe the four engine mount holes onto the rails.

  • Page 8: Install The Fuel Tank

    ❏ 9. Slip the Cowl over the front of the fuse. Cut a hole in ❏ 2. Wrap the tank with 1/4" [6mm] foam rubber secured the cowl just large enough to accommodate the engine. with a couple of rubber bands. After the cowl is mounted, you can enlarge the hole to allow ❏...

  • Page 9: Mount The Wing

    ❏ 4. Remove the covering from the wing center section Mount the Wing where the wing bolts will pass through the wing. ❏ 5. Bolt the wing to the fuselage using the 1/4-20 x 2" Nylon Bolts. Enlarge the holes if necessary to allow the bolts to pass through the wing.

  • Page 10: Mount The Stab & Fin

    Mount the Stab & Fin ❏ 4. Remove your cowl if it’s on the fuselage. Insert a T-pin into the bottom center of the firewall in the front of the fuselage. Tie a small loop at one end of a 42" [1070mm] piece of monofilament string and slip it over the T-pin.

  • Page 11: Install The Tail Landing Gear

    plenty of epoxy in the stab saddle. Recheck alignment using the pin-and-string technique shown earlier. Wipe away excess epoxy before it cures and use T-pins to hold the stab in position until the epoxy has fully cured. ❏ 7. Use a fresh #11 blade to carefully cut through the covering 1/16"...

  • Page 12: Install The Main Landing Gear

    Install the Main Landing Gear ❏ 2. Cut a slot in the tail post of the fuselage 3/8" [9.5mm] up from the bottom of the fuse for the tail gear bracket. Coat the tail gear wire with petroleum jelly where it slides through the bracket.

  • Page 13: Install The Elevator Joiner Wire

    ❏ ❏ 7. Install the main wheels using four 7/32" Wheel Collars and four 8-32 Set Screws. Drill the hub of the wheels ❏ ❏ 4. Locate and remove the covering from the notches using a 7/32" [5.6mm] drill bit if necessary so they fit onto the of the landing gear fairing.

  • Page 14: Join The Control Surfaces

    ❏ ❏ 3. Cut a groove in the LE of the elevators and drill 3/32" [2.4mm] holes where you made your marks to accommodate the elevator joiner wire. Hint: Use a 3/32" [2.4mm] brass tube ™ sharpened at the end to cut the groove. (The Groove Tube Grooving Tool (GPMR8140) works great for this task.) ❏...

  • Page 15: Hook Up The Ailerons

    Hook Up the Ailerons ❏ ❏ 1. If you haven’t already done so, install the rubber grommets and eyelets in your aileron servos. Attach a servo extension to the aileron servo. Use heat-shrink tubing or electrical tape to secure the servo cord to the extension so they don’t unplug in flight.

  • Page 16: Radio Installation

    ❏ 2. Install and hook up - following the manufacturer’s recommendations - three servos, the receiver, switch and battery as shown in the photo. We added a Great Planes Switch Mount & Charge Jack (GPMM1000, not included) for ❏ 9. Bend the pushrod at the mark you made. Cut the convenience and ease of use at the field, installed on the side of the fuselage.

  • Page 17: Pushrod Installation

    Pushrod Installation ❏ 4. Cut the pushrod tubes 1-1/2" [38mm] behind the servo openings in the servo tray. ❏ 1. Cut 1" long slots in both sides of the fuselage for the elevator and rudder Pushrod Tubes to exit the fuselage. Use the measurements in the photo for locating the position of the exits.

  • Page 18: Throttle Pushrod Installation

    the mounting holes. Drill 3/32" [2.4mm] mounting holes through the marks. Wick two to three drops of Thin CA into the holes to harden the underlying balsa, then re-drill the holes. Attach the horns using 2-56 x 5/8" Machine Screws and Nylon Nut Plates.

  • Page 19: Final Assembly

    through a tube (such as a large drinking straw or a brass tube) into a container. Let it sit for about an hour or two to allow the damaging elements to “boil off.” Using an air brush, you may now spray your windshield with your specially prepared LustreKote.
  • Page 20 wing. The holes in the wing ends of the struts should be positioned so they will align with the hardwood blocks in the wing. Do not drill into the wing or fuselage at this time. ❏ ❏ 3. Position the strut on the fuselage and wing. Drill a 3/32" [2.4mm] hole at the fuselage and the front strut mount only.

  • Page 21: Control Throw Adjustment

    Route the antenna to the tail of the model. You may use your ❏ 2. With the wing level, lift the model by the engine preferred method or the method we use in the Great Planes model shop. Drill a 1/4" [6mm] hole through the fuse side in propeller shaft and the bottom of the fin post (this may the proximity of the receiver.

  • Page 22: Preflight

    ™ Find A Safe Place to Fly Balance your Piper Cub using a Great Planes C.G. Machine We strongly suggest that the best place to fly is an AMA Airplane Balancer (GPMR2400) for the most accurate chartered club field.

  • Page 23: Engine Safety Precautions

    Repeat this test with the engine running at various speeds AMA SAFETY CODE (excerpts) with a helper holding the model. If the control surfaces are not always responding correctly, do not fly! Find and correct Read and abide by the following Academy of Model the problem first.

  • Page 24: Flying

    Work on trimming the airplane for straight and level flight FLYING with the transmitter trims at neutral, adjusting the nylon clevises after each flight, as necessary. Also, take note of The J-3 CUB is a great-looking scale airplane and a great-flying the responsiveness of the elevator, ailerons and rudder, and sport airplane that, true to its full-size counterpart, is highly adjust their throws to your preference.

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