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07-25-2012 12:53 AM  8 years ago
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lolramen

rrNovice

Marietta, Georgia

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Resonant vibes?
I've been seeing how much headspeed I can get out of my Rave 450 in order to increase tail authority. Recently though, I noticed that I have one of those visually obvious vibrations in my tail fin. It only happens when I flip into Idle2 which is set at 3200 right now. Is this normal at this high of a headspeed? I know it's about as high as I can safely go. In normal and Idle1, which are 2600 and 2900 respectively, everything seems fine. A little vibe, but not much. Should note that I rebuilt the whole airframe not too long ago, so most everything is new including spindle, main shaft, main bearings, etc. Could it possibly be that the dampeners are gone? Just lookin for a little advice here.
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08-18-2012 03:32 PM  8 years ago
gouki

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philippines

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You decreased the gyro gain for the tail when you inreased the headspeed i presume?
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08-20-2012 10:48 PM  8 years ago
Sky Dancer

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Bryan, Texas

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I've run my Rave 450 at 3400 head speed with no problems.

If you're seeing vibration on the tail, I'll bet it has to do with either with your TR output shaft or your TR hub.

Make sure the TR blade holders are both pulled all the way out (there is some play if they are not stuck inward) and I'd also check TR blade balance just to make sure....

I'm also guessing the bearing on the TR driveshaft is NOT in the middle of the driveshaft. The bearing mounted in the center might cause some tail vibration.

Don C
Keep up your rotor speed !
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