Later came variable-pitch propellers, where the angle of attack of the blades could be increased collectively to take a bigger “bite” of the air for more thrust.

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.

But variable-pitch propellers have a lot of complicated machinery in the hub, which makes them more expensive. Fixed-pitch propellers are cheaper, but they are always a compromise.

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 ...

Europe’s EASA has signed off on a modified version of Tecnam’s best-selling P2002 Sierra with a variable pitch propeller. The P2002JF provides an increase in cruise speed of 5 to 7 knots and ...

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 ...

A 3D-printed hybrid drone can quickly transition between air and water thanks to variable pitch propellers. Watch a video of the drone in action.