Anybody fancy a cabriolet chopper ?

Discussion in 'Aviation' started by Geedee, Feb 25, 2012.

  1. Geedee

    Geedee Well-Known Member

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  2. T Bolt

    T Bolt Well-Known Member

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    Wow! Looks like something was seriously out of balance.
     
  3. tyrodtom

    tyrodtom Well-Known Member

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    It's like the article says, it's ground resonance. It's when rotor rpm and oleo rebound ratios get together.

    The way to prevent it is never stay light on the skids for long, especially when the rotor is winding down from operating RPM. You're supposed to have the collective fully down before you start engine shutdown. I'll bet that pilot didn't.
    When you take off, take off, when you land, plant it.

    TH-55s were noted for that. I've seen it happen. The incident I saw was much faster than that. I think this one is being shown is slow motion.
     
  4. Airframes

    Airframes Benevolens Magister

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    Rather lucky there were only injuries. A friend of mine was killed about 18 years ago, in a similar incident, when the collective failed on landing.
     
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