Counter-rotating propellers
Videos
Counter-rotating propellers are propellers which turn in opposite directions to each other. They are used on some twin- and multi-engine propeller-driven aircraft.
World War I Linke-Hofmann R.I German heavy bomber (1917) with counter-rotating propellers
He 177A Greif with counter-rotating propellers
Contra-rotating propellers
Videos
Aircraft equipped with contra-rotating propellers, coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single engine piston powered or turboprop engine t
Counter-rotating propellers
…Tiltrotor – Aircraft type Contra-rotating propellers – Two-propeller design for improving low-airspeed maneuverability Intermeshing rotors – Helicopter with two rotors turning in opposite directions…
Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races
Contra-rotating propellers of a Spitfire Mk XIX
One of the four contra-rotating propellers on a Tu-95 Russian strategic bomber
XB-35 Flying Wing showing its quartet of pusher contra-rotating propellers. The option was later discarded due to severe vibration in flight and later changed to traditional single rotating propellers.