Problem with Motors/ESC beyond 50% throttle

[Gazzas_86]

Guys,

I've conducted a little test to try and find the problem with my copter,
Basically i disconnected all motors from the ESC's, and one by one had them connected, When i got above 50% as you know, my board wobbled left and right (Roll) before crashing, The quad is in X formation,

If i was looking behind the quad, with the arrow of the board pointing away from me (shown in pic), the Left props (front and back) powered up above 50% with no problems,

The right props (Front and Back) has this behaviour when getting above 50% throttle.....

http://youtu.be/_VzdYeMAT0A

This is regardless whether Aux is on or off

Anyone got any ideas?,

Cheers

Gaz

[LenzGr]

Looks weird. Did you check the motor output on the GUI? Do you see the same oscillation in the output values?

[Hamburger]

swap motors and ESCs around to find out if the symptoms follow. I have had this with partially burned ESCs and burned motor windings.

[LenzGr]

Also, what type of ESC and motors are these? Some ESCs have trouble following the quick throttle changes coming from the flight controller board.