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Old May 09, 2015, 06:58 PM
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shaking/trembling, is this motor/ESC sync issue? help...

Running APM2.7 with FW3.1.5 on a hexa
just installed 6 new motors, the turnigy multistar 3508-640kv ones and Iam getting a noticeable shaking/tremble that just started with these new motors....I am running Afro 30 esc's with SimonK, I went ahead and loaded the latest BHELI and it didnt really fix anything, problem still there....I also tried re-calibrating the ESCs and nothing.....
any ideas where to look? is this the motor sync issue they talk about? Read a number of threads on this thats why I loaded BHELI as it looks like it fixed it for some, but no luck for me.

https://youtu.be/lBE0_tIMR8Q
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Old May 09, 2015, 07:33 PM
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That looks more like gimbal shake. Is that a 3 axis gimbal?

How about posting a video of the aircraft shaking instead?
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Old May 09, 2015, 08:37 PM
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The whole thing shakes is not just the gimbal. ...sorry will post video of that later....but I hooked up all 6 ESCs direct to receiver throttle channel (bypass APM) and it doesn't do it then. ...so maybe it's the PIDs or something else on the APM?
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Old May 10, 2015, 07:48 AM
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fixed....ran AUTOTUNE again and it worked out the shakes.....seems all good now , it did decrease the gains on both roll and pitch so that likely had something to do with it
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Old May 10, 2015, 08:04 AM
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Quote:
Originally Posted by kiosk View Post
fixed....ran AUTOTUNE again and it worked out the shakes.....seems all good now , it did decrease the gains on both roll and pitch so that likely had something to do with it
Yep.

With the gains too high the aircraft overshoots, the FC corrects, the aircraft overshoots, rinse, repeat.....
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