Quadcopter yaws to the right and some GPS problems...

Hi,

I am having an issue with this copter... as soon as it lifts off, it tends to yaw to the right.

I could adjust the yaw trim in the RC but then I will need to move back the trim again or else I am not able to arm/disarm, so I decided not to use the trims and fix the right yaw movement while flying, it's not critical but a bit annoying.

It also yaws easier to the right than to the left (RC untrimmed and trimmed).

It does yaws to the left, but slower, weird.

I'm using a Futaba 7C and I have calibrated the RC many times in the mission planner, also calibrated the accelerometer, did a Live Calibration of the compass, not sure if I'm missing another calibration step. I also tried calibrating using the console, not sure, but I think it's bettter than using the UI.

Also found something interesting, while testing flight modes, I noticed that when I enable STABILIZE in Simple mode, The quad orientation seems to be drifting, and seems to match the yaw to the right problem, 

Worth to mention that Simple Mode worked perfectly the first time I used it, that's it. :(

I'm not sure how to explain it, as soon as I enable simple mode, I need to keep yawing (not sure if the word exists :)) and moving myself to not to lose orientation, until it becomes uncontrollable and switch back to STABILIZE without simple mode enabled.

GPS assisted modes like position hold, RTL, guided, etc, I'm affraid to use them because as soon as I use any of these modes, the quad tends to go who-knows-where pretty fast. (need to read logs, I forgot I have them using this controller :) )

Just in case, I make sure to get a solid blue LED in the APM, I understand that this is when the APM did the GPS lock and it's ready to fly, also, I'm using the Ublox GPS and it also have a solid red light and a blinking blue light.

Other than that, I feel the APM in Stabilize mode is the best thing that I have used since I started this hobby, I haven't even broke more props since I starting using the APM, amazing, until yesterday.

But this wasn't an APM issue, one of the motor mounts broke while in the air, you can see the motor doing its thing :)

https://www.youtube.com/watch?v=usJ5eNsv6EU

Attached a pic of it before the crash.

Nothing really bad happened after the crash, just 1 broken prop and a couple of broken motor mounts (I need to do something about those motor mounts, any ideas?)

I just want to make sure that I have a stable platform using any mode to start trying FPV python magic on it :D

I appreciate your advice.

-Tono

DSCN0577.JPG

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