Contra-rotating propellers
Two-propeller design for improving low-airspeed maneuverability / From Wikipedia, the free encyclopedia
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Not to be confused with counter-rotating propellers.
For contra-rotating marine propellers, helicopter rotors and turbine fan blades, see Contra-rotating.
Aircraft equipped with contra-rotating propellers (CRP)[1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra-rotation. Two propellers are arranged one behind the other, and power is transferred from the engine via a planetary gear or spur gear transmission. Contra-rotating propellers are also known as counter-rotating propellers,[2][3] although the term counter-rotating propellers is much more widely used when referring to airscrews on separate non-coaxial shafts turning in opposite directions.