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Other › Servo horns vibrate during cyclic input
10-16-2005 05:56 PM  13 years agoPost 1
Orion_V

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Cliffside Park, NJ

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Have a Trex with an all metal head, CCPM setup on a heliworkz frame. I've noticed during cyclic input (while spooled up) my servo horns vibrate..vibration increases with headspeed as well. I doubt this is normal. My swash doesn't seem to wobble during spool up. I've toned down my swashAFR cyclic movement to about 60 percent so it doesn't seem to be binding anywhere. The only thing I can think of is that I have a bent main shaft. But I recently changed it and checked the new shaft to make sure it wasnt bent by rolling it on a table. Any other thoughts besides the main shaft? I just changed the feathering shaft as well with sparrows hardened main shaft. Perhaps my sawsh is the culprit here but it seems fine. Thanks or any advice on this!

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10-16-2005 08:41 PM  13 years agoPost 2
Ozydego

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Westerville, Ohio

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To me, it sounds like the servo is not holding up to the pressures imposed on it while the head is spun up.... Its fighting back, and causeing the vibes.... I could be totally off though, What servos are you running???

But Honey, I can't live with just stock.....

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10-16-2005 09:43 PM  13 years agoPost 3
balbs

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Los Angeles, CA

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Could it be the main mast mounts (bearing blocks)? Maybe the bearings are loose or shot?

Balbs

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10-16-2005 09:56 PM  13 years agoPost 4
Orion_V

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Cliffside Park, NJ

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thanks for the response guys...i looked over it again today..and realized the swash vibrates during cyclic input as well...this in turn is causing the servo horns to vibrate...so actually the swash is the culprit here. Now why its vibrating during cyclic is another question. Any thoughts? The main shaft is new and I checked it by rolling it on my table before installing it. Other than having a bent main shaft i don't know what else it could be off the top of my head.

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10-16-2005 11:56 PM  13 years agoPost 5
Orion_V

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Cliffside Park, NJ

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ok...i figured it out. I have the Metal Align metal flybar control set. The two end brackets that screw onto the two metal rods were reversed. I can't believe I missed this. The directions that came with the set seemed like i had it the right way. SO....this did cause my swash to vibrate during spool up. ALSO, the swash should move forw/back and left/right no matter were the flybar is oriented. I'm sure most of you know this but figured i would mention it for newbies. Funny thing is that i've had a few flights with them reversed. It flew but was very twitchy. I knew the Trex was a better flier than what I was experiencing. I can't wait to see how it flies now.

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