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Quad drops when yawing in alt or loiter mode

@Z9G6 wrote:

Hey all!

Trying to diagnose an issue here.

here is the logs.

2017-02-17 13-56-45.bin (193.9 KB)
2017-02-17 13-56-45.log (479.9 KB)

the Quad is a 500 sized frame with a mini APM running 3.2.1 and when flying in stability mode it is responsive and has no problem holding alt while around half throttle. can ascend kinda quick but is a little under propped. yaws just fine while holding altitude with out throttle adjustments.

If I just let it hover with minimal input it seems fine, My issue is when I enter any non stab mode like alt hold, loiter, or auto it will drop almost like a rock when I give it any yaw input. or if I move forward it slowly starts to drop.

In both cases any throttle input has zero effect except a couple of times I recovered but the throttle reacted in a very delayed manner and once it was recovered it was very unflyable (all over the place just hard to control) until I set it to stab mode, then it became docile again and very controllable.

can someone help me puzzle this one out I would saw that I think it is a shot baro but the logs don't show me what I am expecting for a bad baro (also I may have the entire wrong idea for what to expect for a bad baro since I am new to reading quad logs).

lastly while in a non stab mode on ground when disarming the quad tends to tip over, in stab mode it disarms fine.

Thanks all!

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