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T-REX 550 › trex 550 dfc vibration
11-25-2017 04:14 AM  21 days agoPost 1
eyeflyhelis

rrElite Veteran

charlotte nc

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was flying my 55 in norm, idle1 and 2 never had an issue. burnt up an esc on the ground, swapped it out for a CC100amp changed nothing else. now at idle 1 and 2 it starts to oscillate.

tried to bump up head speed and it got worse. brought down head speed to 50% and it was fine.
also put back into normal mode and its not there.
i swapped the blades and it was a little better, also ran better

any ideas?

only you have the power to make no difference!

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11-25-2017 11:38 AM  21 days agoPost 2
870heli

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Monson Ma. USA

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Check the bolts on the feathering spindle. I have seen that do what you are describing.

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11-25-2017 02:44 PM  21 days agoPost 3
eyeflyhelis

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charlotte nc

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Thx, they are tight

only you have the power to make no difference!

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11-25-2017 03:55 PM  21 days agoPost 4
870heli

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Monson Ma. USA

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If it gets worse as speed go's up I would think balance. It didn't do it before so I see no reason why its doing it now. Have you checked the head balance?

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11-25-2017 03:58 PM  21 days agoPost 5
EEngineer

rrProfessor

TX

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Resonance due to a slightly different RPM?

Blade dampeners too stiff can cause such resonance.

Logo 600SXs, 800XX, TDR IIs

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