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Head SHAKE

Old 06-16-2009, 02:26 AM
  #1  
danman_83
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I had an extremly timid "crash" the other day with my CP+, it came down from about 1 foot off the ground and barely touched a blade to the cement. It broke the blade which I new would happen so I switched it out with a new blade expecting to solve the problem, but when I spun the thing back up it had a wicked shake. Darn I said to myself, I've got to tear it apart...oh well, that's fun too. So i tore it apart and replaced the main shaft, didn't solve the problem. Replaced the flybar and reset weights and paddles...didn't help...replaced the spindle...no dice...

Any other suggestions on how to fix this thing? I've also tried to track the blades some, but with the amount of wobble its too hard. Also the "crash" didn't affect either of the tracking bars at all, and they were dead nuts on before...Help please? I'm out of ideas
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Old 07-28-2009, 03:07 AM
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Nathan King
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I'd bet money you bent the feathering shaft.
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Old 07-28-2009, 05:58 AM
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Twmaster
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That's my vote too.
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Old 07-28-2009, 07:41 AM
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vortex05
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Yeah feathering shaft vote #3
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Old 07-28-2009, 04:28 PM
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MaxAdventure
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Roll the shafts on a mirror, you can see and hear the wobble if it's bent. My experience says the feathering spindle is the first to go, followed by the main, then the tail shaft. Sounds like you replaced without checking.

You didn't say, but did you weigh the mains? Did you dynamically balance the mains as a set?

Have you checked your main bearings for play in their seats, or damage?

Measure your rod lengths, if you're accurate tracking can be dang close to right on.
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Old 07-28-2009, 04:51 PM
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Heli Jim
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The quickest way to check your feathering shaft is to remove the blades and then insert the allen wrench in the little bolt on one side of the shaft and rotate the shaft. While you do this, hold the blade holder on the other side and if you feel ANY movement at all, you need to replace the shaft.
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Old 08-01-2009, 06:10 PM
  #7  
danman_83
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Thanks for all the inputs, I'd already replaced the feathering shaft, but I found out later after going to my lhs that the guy who had the bird before me didn't have near enough shims in the head, which turned out to be the problem..he only had one on either side and i put in 3 or 4 which fixed the problem
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Old 08-01-2009, 09:38 PM
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vortex05
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the plastic head tends to be a wear item. Over time you need to add more shims.
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