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03-31-2012 09:15 PM  7 years ago
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strat1960s

rrApprentice

San Antonio Texas

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Gyro going nutz!
I appreciate everyones comments and advice.

This afternoon I thought I'd run a little test to see what happened. I mounted my Radikal G20 to a barstool and fired it up. While the motor was idling I watched as the tail blades went from 0% pitch to 100% pitch CCW. The only input I gave was to put the tail blades back to 0% pitch. This would most likely be my tail drift. Why the tail would lock into a CCW prio? I'm hoping it's related to vibrations casuing the gyro to go nutz!

I know I need to re-tune my motor. I am 99% certain I am running very rich. So to lean out my low idle, CW or CCW??? Do I even need to worry about the high idle yet??

Any comments or suggestions would be appreciated.

Thank you.
I always have fun. Some times are more fun than others.
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04-01-2012 06:04 PM  7 years ago
RM3

rrElite Veteran

Killeen, Texas - USA

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any time the tail moves "by itself" while the heli is not moving...is a very good sign that the gyro is getting a signal from the TX to move. As the gyro is in AVCS mode, any tiny amount of subtrim, anywhere in the TX system, could be subtrim, could be revo mix, could be anywhere in any of your flight modes, some setting somewhere in the TX setup for that heli.

Try the test again with the engine turned off, both in rate mode and AVCS mode in all flight modes, Norm, Idle1, Idle2 etc...If the tail pitch is changing in anything other than rate mode then the gyro is getting a signal from the TX in some whay....

Then do the same test again with the engine in idle only. any spooling up of the heli while mounted to an immovable object is a big ol no no.. this can cause a resonant effect and leave you with a damanged heli or worse

if it does move with the engine off in any combination of AVCS and flight mode, then the TX is sending the signal.

If it does it with the engine running only...then its a combination of vibration or engine tune/mounting/gain setting...
showing a preference will only get you into trouble, 90% of everything is crap...
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04-01-2012 06:05 PM  7 years ago
RM3

rrElite Veteran

Killeen, Texas - USA

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swap out your servo/gyro too just in case...showing a preference will only get you into trouble, 90% of everything is crap...
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04-01-2012 07:52 PM  7 years ago
Pistol Pete

rrProfessor

Seffner, FL

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Its natural for the blades to go on full tilt when on HH.

If stool swivels, you can turn heli and watch tail respond accordingly. (engine off)

Once HH is switched off, blades will return to mechanical center.

If they center exactly at zero pitch, there's your drift problem.

You have to adjust for the drift in RATE mode. If it drift in RATE it will drift in HH.

You know its properly adjusted once youre able to switch between HH and RATE while hovering without any tail kick.
~~Enjoying the hobby one flight at a time~~
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04-02-2012 12:46 AM  7 years ago
strat1960s

rrApprentice

San Antonio Texas

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So I've got the heli all pulled apart. Pulled out the flybarless head. Dusted off the Beast X manual. Time to go all out!

We'll see if this was a good idea or not.....

Ted
I always have fun. Some times are more fun than others.
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