Built by the British in the 1940s, the Cierva W.9 was an experimental helicopter that featured a no-tail-rotor (NOTAR) system.
Previously:
MD Helicopters MD 520N no tail rotor helicopter - photos
Aerotecnica AC-12 light helicopter - photo and video
Piasecki HRP Rescuer tandem rotor helicopter - photos
Helicopter with intermeshing rotors - GIF
Fairey Rotodyne compound gyroplane - photos
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