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Contra-rotating propellers

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Contra-rotating propellers


High Quality Content by WIKIPEDIA articles! Contra-rotating propellers, also referred to as coaxial contra-rotating propellers, apply the maximum power of usually a single piston or turboprop engine to drive two propellers in opposite rotation. Contra-rotating propellers are common in some marine transmission systems, in particular for medium to large size planing leisure crafts. 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 should not be confused with counter-rotating propellers, a term which describes multi-engined aircraft with the airscrew on one engine turning clockwise and the other counter-clockwise.