ground resonance

Ground Resonance Rattles Brazilian Chopper to Bits

Friday, February 24, 2012
By George Hatcher
Ground Resonance Rattles Brazilian Chopper to Bits

What: Corpo de Bombeiros Militar do Estado do Pará Helibras HB 350BA Esquilo Where: Benevides Brazil When: Feb 22, 2012 Who: 4 aboard, no fatalities Why: The rescue chopper vibrated itself apart after landing. “Ground resonance” occurs when a sitting helicopter’s rotors become unbalanced while spinning. A resident expert says this can happen because... »

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