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  • Reminded me of a full sized incident that happened locally recently. I know it's not ground resonance (muppet on ground pulls cable into main rotor), but impressive anyway. https://www.youtube.com/watch?v=v5aMT9MBfZI  and https://www.youtube.com/watch?v=dEJzJqZWgmk. Note in the second video that the pilot gets thrown from his seat and falls back in to the rear seat. Talk about luck!

  • This is more of an issue with a CH-47! https://www.youtube.com/watch?feature=fvwp&NR=1&v=D2tHA7KmRME

    Although, I should point out this was a controlled test. Yet another reason not to do tethered testing with props on?

  • Yup, you are right Andrew! I was mislead by someone who wrote an article in local newspaper. Title changed.

  • wow,

    there are a few more example online of ground resonance specifically - has nothing really to do with balanced props, has to do with how being on the ground allows the frame to act like a tuning fork.

  • This is the cause of ground resonance (http://en.wikipedia.org/wiki/Ground_resonance) not necessarily unbalanced props..

    You can see a similar situation in this MacGyver Episode clip...the pilot quickly realized the problem and lifted off immediately. 

    https://www.youtube.com/watch?v=6vICf8l-KV0

  • Yeah, helicopters don't really fly, they just vibrate so badly the earth rejects them.

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