The Sky Flier 1 is a bit of an oxymoron in being one of the larger micro models. This little red plane has a rear spar and horixontal stabilizer made of nothing more than an axle, and a leading edge made from a flexible tube. Unlike the other micro models, it actually has a couple of gears and an real mechanical function.
Propeller
The 3 blade propeller is geared to a transverse axle and then connected to the main landing gear with a belt. As the model is pushed along, the prop spins. The belt adds considerable friction to this feature, so some pressure must be applied to the model to give the wheels enough traction to grip.
By Technicopedia