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Originally Posted by Seahawk
Agree. That is not my issue here at all.
Helicopters are vibration nightmares and many design compromises are made to dampen vibs, which substantially impact the airframe structure in terms of fatigue and stress cracks.
The drive train in a helo must be in harmony with respect to vibration...there are instances where low frequencies harmonics in different flight regimes (harmonics in helicopter change depending of hover, forward flight, etc.) can quickly damage the airframe and drive components.
I can refer to any number of airframe and drive component "improvements" to the H-60 that ended up causing unintended stress on the airframe.
You can also cause what is referred to as "ground resonance" by changing drive components:
The OP can do whatever he wants, not my issues, just don't fly over my house
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Something was lost in rotation there......thats interesting it was flying?
Wonder what came off, or broke?
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162 Assault Helicopter Co,(Vultures ) D troop 3/5 Air Cav. ( Bastard CAV) South of Saigon, U Minh Forest, Delta, and most parts in between.
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