My video's

crazy idiot.......................
 
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.
 

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Wow! I can't believe that Chinook actually shook itself apart!
 
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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