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HelicopterRadio - Servo - Gyro - Gov - Batt › 611 tail twitch at center stick
07-08-2008 03:32 PM  9 years agoPost 1
wingspin

rrNovice

Western Illinois

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I have a high mileage raptor 50 that has recently developed a problem @ center stick. A broken shouldered main shaft bolt caused inapproprate ground contact last year - servo and gyro (broken case) were sent to Hobby Services and repaired and worked fine for some time.

Here is the setup - Raptor 50, os 50 hyper with muscle pipe, TJ pro, fub 9252's on cyclic, jr 8311 on collective, gy 611 with 9256 (sensor @ rear - gain @ 37%). 4.8v nicads, JR HD switch, revolution antenna, 649 pcm receiver.

The twitch, oscillation, or jitter occurs at center stick, engine running or not. I've tried changing the setup as recommended on several posts but have not had any success. When the gain is reduced to near 0, the twitch goes away. It seems the gyro\servo can no longer consistently find the center position.

Any suggestions or opinions on what the problem is are greatly appreciated.

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07-08-2008 03:50 PM  9 years agoPost 2
tchavei

rrProfessor

Portugal

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I would look at your Tx first. Pot problems usually start developing around center stick where the tx starts transmiting dirty signals.

I'm mentioning this because a flying buddy just went through hell and 3 different helis until he found that his rudder pot has wear out.

If you have a radio that is able to display channel values, go into that menu and check if the values start jumping when you're at center stick. Another way would be to hook up a normal servo in your rudder channel and see if it starts to jitter around center stick.

Sometimes the craziest thing is the answer to a problem.

Tony


--------------------
"Perfection and patience usually walk side by side..."

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07-09-2008 04:13 PM  9 years agoPost 3
wingspin

rrNovice

Western Illinois

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Thanks for the suggestion - The JR 9303 pcm does have a lot of hours; but i don't get a rudder channel oscillation on any ov several planes; also have a 601 on a raptor 90 with no apparent issues; i plugged several digital servos in the rudder channel as well and don't get the wiggle with them either.

Anyone have other thoughts on what the problem is?

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HelicopterRadio - Servo - Gyro - Gov - Batt › 611 tail twitch at center stick
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