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Piasecki PA-97

A gust of wind from the rear of the aircraft induced some movement across the ramp. The undercarriage responded badly to this, the bogies shimmying uncontrollably.[3] Vibration in the framework then coupled with a helicopter phenomenon known as ground resonance.[3] The vibration was sufficient to cause a structural failure as the starboard rear helicopter broke off its mounting, its rotors cutting into the gasbag.[3] The unbalanced lift then made the vibrations worse and the remaining three helicopters broke free.


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Der Leistungsabfall in Hubschrauber 3 wurde im Flugunfallbericht auf ein fehlendes Teil in der Verbindung des Gashebelsystems zurückgeführt. Als weitere Faktoren kamen hinzu:

Schwingungen im Fahrgestell
Schwingungen des Rotorsystems
Keine Bremsen am Fahrgestell
keine Steuermöglichkeit des Fahrgestells

https://en.wikipedia.org/wiki/Piasecki_PA-97
https://www.youtube.com/watch?v=_7jENWKgMPY&ab_channel=gmcjetpilot
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Nickname 4 Mar, 2021 @ 2:16pm 
Schwingungen im Fahrgestell
Schwingungen des Rotorsystems
Keine Bremsen am Fahrgestell
keine Steuermöglichkeit des Fahrgestells
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