gyro creaping - HeliFreak
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Old 10-11-2010, 09:14 PM   #1 (permalink)
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Hi I'm having a problem with my gryo its a Jr G500T. On a blade 400. Here’s what its doing the noise is drifting left.
So I put it on the bench to check it out and I observed this after it initializes. It starts to creep right If I move the rudder right it goes left then after I center the rudder it slowly creeps all the way right. Any Ideas what would cause this?
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Old 10-12-2010, 09:28 AM   #2 (permalink)
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Did you try lowering your gain just a bit? I assume this is in HH mode? What does it do in RATE mode? If it still does it in RATE mode, you may have a tail servo about to go out on you.

You could also try by-passing the gyro (plug servo directly into rudder ch on rx) and see if it still drifts. That could help you pinpoint gyro from servo.
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Old 10-12-2010, 09:30 AM   #3 (permalink)
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Adjust the sub-trim on the rudder channel until the servo doesn't drift.
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Old 10-12-2010, 12:23 PM   #4 (permalink)
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Thanks sub trim has got me thinking, I did adjust the sub trim to get my servo arm 90deg.
But I did re initialize it, is the sub trim somehow adjusting the gyro? If so what do I center the arm with? I thought all I had to do was get my servo centered with the sub trim and then adjust the linkage back to the tail square and that would solve my slight left drifting. But now it’s worse..
Following this tips for noobies.


http://www.ronlund.com/tr_setup.htm
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Old 10-12-2010, 12:26 PM   #5 (permalink)
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You have to adjust the sub trim to stop the creep. Only way to adjust the servo center is use a different servo arm. Find a star arm, rotate it 90 degrees at a time, find the one thats centered and cut the rest off. Or use a wheel and drill a hole (thats better anyways because its stiffer)
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Old 10-12-2010, 12:27 PM   #6 (permalink)
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Oh ya, ignore any posts that say not to use sub trim
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Old 10-12-2010, 01:09 PM   #7 (permalink)
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Quote:
Originally Posted by BarracudaHockey View Post
You have to adjust the sub trim to stop the creep. Only way to adjust the servo center is use a different servo arm. Find a star arm, rotate it 90 degrees at a time, find the one thats centered and cut the rest off. Or use a wheel and drill a hole (thats better anyways because its stiffer)


And... Adjust the pushrod in rate mode (trim and sub trim at zero) so the heli does not yaw when hovering. Then in HH mode adjust the sub trim so the servo does not creep.
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Old 10-12-2010, 02:54 PM   #8 (permalink)
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Actually, adjust the sub trim first so you don't get any servo drift, or you will never get a stable hover in rate mode no matter what you do with the linkage rod.
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Old 10-12-2010, 06:08 PM   #9 (permalink)
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ok thanks I'll go try that now.. 1st sub trim than change arm, and then adjust linkage .
stay tuned!
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Old 10-12-2010, 08:43 PM   #10 (permalink)
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yep that did it.. all better now...thanks Barracuda..
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Old 10-13-2010, 08:08 AM   #11 (permalink)
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No problem, glad you got it going
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