Gyrodyne

A Gyrodyne is a rotorcraft with a rotor system that is normally driven by its engine for takeoff and landing—hovering like a helicopter and has either one or two propellers mounted on wingtips, for propulsion and for torque correction. In response to a Royal Navy request for a helicopter, Dr. James Allan Jamieson Bennett designed the gyrodyne whilst serving as the chief engineer of the Cierva Autogiro Company. The gyrodyne was envisioned an intermediate type of rotorcraft, its rotor operating parallel to the flightpath to minimize axial flow with one or more propellers providing propulsion.