Zemjena rezonansa kaj Boeing CH-47 Chinook

It's just a ground resonance test. Has nothing to do with rotors failing, cuz that's basicly hardly possible. You could have a main drive shaft failure and then the rotors would collide. But that's obviously not what's happening here.

ground Resonance !

in case you are wondering there is a damper on each blade the allows the lead and lag depending on the input from the cockpit if you notice on of the blades appears to be swinging around insteds of spinning that because one of the dampers broke off which then throws off the balance of the rotorhead and you get what you see and yes it was a boeing test

Looks to me like the back rotor failed and threw the balance way off.

actually i beleive it is a ground resinance test,

i agree, its kkind of eerie with the lack of sounds :S

im a mechanical engineer but don't claim to be a heli expert but i think this was a demonstration of a failure of the main rotor, and perhaps what the secondary could do to "parachute" survivors.?