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02-08-2008 10:16 AM  11 years ago
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helirulz

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Singapore

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vibrations on spool-down
Guys, im having very strong vibrations whenever i drop my throttle to 0% very quickly..strong enough to shake the battery out of the velcro loop strap that i use to secure the Lipo in position.
Somehow the vibrations aren't so violent(or even unnoticeable) on gentle spool-downs as well as during spool-ups

I loosened my blades and the problem still exists. I also notice that my blades are very-slightly out of track...almost unnoticeable IMO.

Strangely enough, the vibrations didn't happen when i first flew my Beam. It only happened after i replaced one of the spindle locknuts since it wasn't threaded properly. At the same time i lubed my spindle and dampers since its a common practice on my nitro machines.

What could have caused the vibrations?
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02-08-2008 01:30 PM  11 years ago
frebou

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Montreal / Canada

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have you tryed to cut the motor with throttle hold instead of moving throttle stick to zero?

You probably have some negative pitch down there and ny the time you stop the motor, you apply a great amount of force downward. Considering the out of track blades, it could shows as vibration... Just an idea.

You should try to get rid of the head tracking problem. They steal you power, precision and make the whole heli vibrate for nothing. It is usually quite easy to fix too

Have you ever crashed it? Could your spindle be bent? If so, it could easily be this too, on certain position your blades may become really out of track.
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02-10-2008 10:28 AM  11 years ago
helirulz

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Singapore

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Just an update guys, its working fine now.
I realised that the linkages that connects to the blade grip should ideally go in only one direction because the diameter of the gap in the different amongst the 2 different directions.

I reversed the linkage and the problem went away
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02-10-2008 03:59 PM  11 years ago
frebou

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Montreal / Canada

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You mean, 1 ball link fitted on the ball in reverse direction was your problem?!

Are you sure the fact of adjusting this did not solve your "out of track" problem, that would have been the real cause of your problem.

It bust me reaaaal sloppy to cause that much shake... and I doubt a reversed ball link would be sooo sloppy... Is it?
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02-12-2008 12:57 PM  11 years ago
helirulz

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Singapore

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I have no idea myself..but hey. Its all smooth now
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