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- Contra-rotating abstract "Contra-rotating, also referred to as coaxial contra-rotating, is a technique whereby parts of a mechanism rotate in opposite directions about a common axis, usually to minimise the effect of torque. Examples include some aircraft propellers, resulting in the maximum power of a single piston or turboprop engine to drive two propellers in opposite rotation. Contra-rotating propellers are also common in some marine transmission systems, in particular for large speed boats with planing hulls. Two propellers are arranged one behind the other, and power is transferred from the engine via planetary gear transmission. The configuration can also be used in helicopter designs termed coaxial rotors, where similar issues and principles of torque apply.Contra-rotating propellers should not be confused with counter-rotating propellers, a term which describes non-coaxial propellers on separate shafts; one turning clockwise and the other counter-clockwise. Tandem-rotor helicopters such as the CH-47 Chinook also use a counter-rotating arrangement.The efficiency of a contra-rotating prop is somewhat offset by its mechanical complexity. Nonetheless, coaxial contra-rotating propellers and rotors are moderately common in military aircraft and naval applications, such as torpedoes, where the added maintenance cost is not a primary concern.".
- Contra-rotating thumbnail Ka-32-SovietUnion-1989.jpg?width=300.
- Contra-rotating wikiPageExternalLink v=onepage&q&f=true.
- Contra-rotating wikiPageID "1054980".
- Contra-rotating wikiPageRevisionID "602380274".
- Contra-rotating hasPhotoCollection Contra-rotating.
- Contra-rotating subject Category:Propellers.
- Contra-rotating type Artifact100021939.
- Contra-rotating type Device103183080.
- Contra-rotating type Instrumentality103575240.
- Contra-rotating type MechanicalDevice103736970.
- Contra-rotating type Mechanism103738472.
- Contra-rotating type Object100002684.
- Contra-rotating type PhysicalEntity100001930.
- Contra-rotating type Propeller104011827.
- Contra-rotating type Propellers.
- Contra-rotating type Whole100003553.
- Contra-rotating comment "Contra-rotating, also referred to as coaxial contra-rotating, is a technique whereby parts of a mechanism rotate in opposite directions about a common axis, usually to minimise the effect of torque. Examples include some aircraft propellers, resulting in the maximum power of a single piston or turboprop engine to drive two propellers in opposite rotation. Contra-rotating propellers are also common in some marine transmission systems, in particular for large speed boats with planing hulls.".
- Contra-rotating label "Contra-rotating".
- Contra-rotating sameAs m.03bx2q4.
- Contra-rotating sameAs Q5253262.
- Contra-rotating sameAs Q5253262.
- Contra-rotating sameAs Contra-rotating.
- Contra-rotating wasDerivedFrom Contra-rotating?oldid=602380274.
- Contra-rotating depiction Ka-32-SovietUnion-1989.jpg.
- Contra-rotating isPrimaryTopicOf Contra-rotating.
