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Contra Rotating Props

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  • Contra Rotating Props

    Hi Aj - and othet "techies" - contra rotating props, what do these achieve that an "ordinary" prop would not ?
    RobB


  • #2
    Click,
    http://en.wikipedia.org/wiki/Contra-rotating_propellers
    “The only time you have too much fuel is when you’re on fire.”

    Erwin

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    • #3
      Contra rotating props are as efficient as normal props but with better statistics. They allow an aircraft a decent top speed (the Tu-95s cruising speed is 710kmph/385knots, a max speed of 925kmph/500knots).

      The problem with the bear is it is very noisy. Im not sure if this is a problem with all contra rotation props or not, however the bear was noisy enough to be heard inside escort fighters. It also has a noise frequency so unique it can be tracked by the US Sonar Surveilance System which was intended to track Soviet submarines.
      Sam Rudge
      A 5D3, some Canon lenses, the Sigma L and a flash

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      • #4
        All I know is that on helicopters it eliminates the need to have a tail rotor

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        • #5
          Check out the Chinooks or the Sea Knights, also the russian Kamovs with contra rotating rotors


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