Barring the smallest manned airplanes, most aircraft that are pulled around by a prop have variable pitch propellers. The reason for this is simple efficiency. Internal combustion engines are most ...

Heath demonstrated the first "engine-powered, engine-controlled, variable and reversible pitch propeller" in 1919, but was unsuccessful in convincing the Army of the practicality of the concept. He ...

Aalborg University students created a drone prototype that can both fly and swim, using variable pitch propellers for smooth transitions. Their design points toward a future of devices capable of ...