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Home✈️Aircraft🚁Helicoptere-AlignT-REX 550 › trex 550 dfc vibration
11-25-2017 04:14 AM  21 months ago
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eyeflyhelis

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charlotte nc

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trex 550 dfc vibration
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 months ago
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 months ago
eyeflyhelis

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charlotte nc

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Thx, they are tightonly you have the power to make no difference!
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11-25-2017 03:55 PM  21 months ago
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 months ago
EEngineer

rrProfessor

TX

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Resonance due to a slightly different RPM?

Blade dampeners too stiff can cause such resonance.
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