My video's

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These video clips show what happens when they get into a resonant condition being close to the ground. Maybe Deradlerisgalant can shed some light on what causes this.

I think it has something to do with the downdraft from the blades interacting with the airframe.
 

Attachments

  • ch-47_failure_back_view_617.mpg
    13 MB · Views: 58
  • ground_resonance2_962.avi
    9.1 MB · Views: 48
  • ground_resonance_187.avi
    6.8 MB · Views: 47
Have you guys seen this one? [Warning: not a happy ending]

Unfortunately they left some control surface locks on during take-off
(improper pre-flight check). Pilot was son of owner but did not have as
much flight experience. The Caribou was modified with new engines.

It's a link: http://www.big-boys.com/articles/oldplanecrash.html

:(
 

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