Model Kits







Height: 3.1 inches
Length: 3.4 inches
Width: 2.9 inches
Weight: 3.1 oz
Gear Ratio: 28:1 to 42:1
Flapping: 35° with
  adjustable dihedral
Power: 100 watts

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BirdKit's modular ornithopter gearbox makes it much easier to build a large RC ornithopter on your own. This is the same gearbox that is included with the new Crossbow 2 ornithopter kit.

The ornithopter gearbox is 3 inches tall. It's suitable for RC ornithopters weighing about 1 pound (0.5kg) with a 4 to 7 foot wingspan. The gearbox is designed to fit in a hollow fuselage. You can build your own fuselage using traditional balsa wood construction, and the Crossbow 2 kit features a lightweight fiberglass body.

The carbon fiber studs on the gearbox have a 0.240 inch diameter, designed to fit Sky Shark 2PT wing spars available here and included with the Crossbow 2 kit. The gearbox assembles quickly with screws. The gearbox sides are made of durable G10 composite material, and ball bearings are used throughout.

The gearbox is sold with a powerful brushless motor that is matched to the gearbox. The motor may differ from the photos/video. A 3 cell lithium polymer battery is recommended. The gearbox comes with a set of five pinion gears: 16, 18, 20, 22, and 24 teeth. This allows a range of gear ratios from 28:1 to 42:1.

Building your own ornithopter is much easier with the ready made gearbox. Order one today and get started on your next amazing project!

Ornithopter Gearbox - out of stock

Currently the ornithopter gearbox is only available as part of the Crossbow 2 ornithopter kit.