Dynamic-variable-pitch is based on a flexible cam made of flex-steel and other unique components that mate to a propeller or rotor system. The cam vectors thrust and counters dissymmetry of lift.

In the extreme case of a propeller turning very slowly while the airplane advances rapidly?a feathered propeller, for instance?the blade lift ceases to provide any thrust component at all.

Propeller airplanes can land on short runways due, in part, of the effectiveness of the propeller reversing. Ask the Captain: Why ‘reverse thrust’ is a misnomer Q: Is it normal for small ...

Both modes have been used with the air propeller being favored for high speed record attempts in still water, and the water propeller finding favor for sea going boats. The action of a propeller is ...