Variable pitch propeller
Variable Pitch Propeller is intended for Experimental light and Ultralight aircraft, airboats, hovercrafts, snowmobiles etc. The hub has a special mechanism allowing to change the prop pitch on a running engine. It allows to keep maximal prop efficiency, thrust an fuel consumption for high airspeed range. Airplanes with VPP have shorter takeoff, faster climbing, better fuel efficiency, higher maximal speed.