I wonder what this test proves? That you can tie a helicopter down, put it on full power and disintegrate it? WTF!?
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this was a ground resonance test but its NOT cause by pockets of air.. the blades are at flate pitch in this test.. it can happen to any helicopter (usualy one with wheels) an oscellation starts and is small but if it hits just the right frequency this can happen. the way to get out of it is to lift off the ground for a seccond and then set it back down. the aircraft HAS to be touching the ground for this to happen.