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Contra-Rotating Propeller
From SKYbrary Wiki
| Article Information | ||
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| Category: | General | 
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| Content source: | SKYbrary | 
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| Content control: | EUROCONTROL | 
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Description
Contra-rotating propellers refers to an installation in which two propellers are attached to the same engine with one mounted immediately behind the other. The two propellers contra-rotate (rotate in opposite directions around the same axis) with engine power provided via a planetary gear or spur gear reduction gear box. Use of contra-rotating propellers recovers energy lost due to the motion of the air in the slipstream of the forward propeller and allows for an increase in power without a corresponding increase in propeller diameter. It will also help counter the torque effects of a high power piston engine.
Contra-rotating propellers should not be confused with counter-rotating propellers.
