J-3 Cub 1/9 Scale
[kit-J3 Cub]


The Mountain Models J-3 Cub was CAD designed to be a lightweight, super easy to fly, laser-cut, scale electric parkflyer.

Interlocking laser-cut balsa and plywood parts make assembling the models as easy and as fast as possible.

The most complete hardware set you've ever wanted is included so the only things you have to add are covering, power system, and radio.

Designed in the thin air at 6000 feet, the cub flies beautifully and has plenty of flying power on a simple 80 watt brushless outrunner. The plane in the pictures weighs a paultry 14.2 ounces ready to fly! (Yes, that does includes everything, even a 2S1200 mAh LiPo) It is still plenty durable and the structure was not compromised to hit this weight. Compare this plane to a Chinese BARF that weighs twice what ours does and theirs looks ugly as sin!

This plane is what relaxing flying is all about!

This product contains the following items:
J-3 Cub Fuselage Kit» 1 x J-3 Cub Fuselage Kit     $79.00
J-3 Cub Wing Kit» 1 x J-3 Cub Wing Kit     $39.00

Cost of separate parts: $118.00

You save $9.00


  • Wingspan: 48 in
  • Length: 30 in.
  • Wing Area: 332 sq in
  • Weight: 13.4 - 17 oz (Yes, we really did hit 13.4 oz with a brushless outrunner and LiPo battery!)
  • Loading: 5.8 - 7.6 oz/sq ft
  • Controls: 4 (Rudder, elevator, ailerons (2 servos), throttle
  • Power: 350 sized Brushed or Brushless power systems.
  • Piloting: Super stable, easy to fly
  • Building: "Could be a first balsa build"

Kit Contents:

  • Laser cut balsa and plywood
  • Vac-formed cowling and engines
  • 2 in. DuBro main wheels, 1" DuBro tail wheel 
  • DuBro Micro Servo Connectors 
  • DuBro Micro EZ Links 
  • Nylon wing bolts
  • Hatch magnets
  • All wire for scale landing gear, pushrods, etc.
  • All other hardware needed, including screws, bolts, nuts, etc.
  • Includes 3 motor mounts; stick mount, rear firewall mount, and front firewall mount.
  • Includes Full-Size plans.

Tools Needed:

  • Sharp knife (#11 X-Acto)
  • Sealing Iron and iron socks
  • Sanding block with 320 and 400 grit sandpaper
  • Screwdrivers
  • Needle nose pliers
  • Wire bender or pliers
  • Wire cutters
  • Plastic wrap or wax paper

Items Needed to Complete:

  • 1 roll lightweight covering (SoLite or similar)
  • Optional: Extra covering or trim sheets for detail work as desired for finish
  • Paint for cowling and engine details 
  • Thin and thick CA
  • Epoxy, 5 to 10 minute
  • 4 channel transmitter minimum
  • Micro receiver, 4 ch. minimum
  • 2 ea. HS-55 servos (or similar) for rudder and elevator
  • 2 ea. GWS Pico/Naro servos (or similar) for ailerons 
  • 2 ea. 12 inch servo extensions
  • Servo Y-Extension for aileron servos (or 5ch RX, and TX capable of running 2 aileron servos)
  • Brushless Power Systems:
    • Custom CDR Single, GWS 2205-15T outrunner, or sililar 70 to 100 watt outrunner. 
    • LiPo Battery (from 800 to 1200 mAh)
  • Brushed Power System:
    • GWS EPS350 "C"
    • Micro brushed ESC, 10A minimum
    • GWS 9x7 2-blade prop
    • 8-cell, 650 mAh NiMH battery

VIDEO 1: Video of the Alpha 1 Model (3.7 MB)

We will post new video as soon as we can.

The current version of the fuselage manual is 1.0: J-3 Cub Fuselage Manual (1.12 MB)

The current version of the wing manual is 1.0: J-3 Cub Wing Manual (938 KB)

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Mountain Models & Laser Arts
2935 N Lynndale Drive
Appleton, WI 54914