The mechanical system of the microcopter is ingeniously simple: absolutely nothing rotates apart from the rotors! Therefore a light crash on grass usually means only the propellers have to be replaced.

Ingeniously simple mechanical system:
The mechanical system of the microcopter is ingeniously simple: absolutely nothing rotates apart from the rotors! Therefore a light crash on grass usually means only the rotors have to be replaced. The quadrocopter, for example, consists of the following components: a flight control card with the main control system, four cards with brushless motor controllers, four brushless motors including propellers, frames and various parts such as receiver, battery, canopy etc.