In the late-1960s, VFW (Vereingte Flugtechnische Werke) built an experimental open gyrocopter modelled on the Bensen B.8M. This VFW-H2 was unusual in having ducted rotor blade tip jets supplied from the 72hp McCulloch engine. The engine itself was mounted behind the pilot and drove a two-blade pusher propeller.

R.Simpson "Airlife's Helicopter and Rotorcraft", 1998