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 ...

Actuators tilt the rotor blades — changing ... rather than heavier, more complex variable pitch propellers. Unfortunately, the early developers of VTOL drones called these propellers “rotors ...

It takes petrol power – and a clever variable pitch rotor system that makes this gas-powered drone just as stable, quick and responsive as its electric brethren. Scaled up, it could carry 200 kg ...

Well, the electric propulsion system — which includes the propeller system, variable pitch actuation, coolant pump, nacelles and relevant electrical wiring — was approved as part of the ...

Interior of Turnbull's workshop, 1919, when his efforts to solve the problem of a variable-pitch propeller were in full swing. (Wallace Rupert Turnbull fonds, Turnbull-53, New Brunswick Museum ...