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BK 117 D-HBMT: experimental rotor system?
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9th Feb 2016, 05:44
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GipsyMagpie
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Bifilar
I suspect that's a bifilar vibration absorbing device. They put done on an S-61 once upon a time. I think it can be tuned to take out a certain frequency of head vibration. Looks somewhat more extreme than others I've seen.
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