S900 A2 Yaw issues

[MrMarr]

Hi all, I took my s900 out for a little fly the other day and noticed it was doing something odd. On yawing it in either direction its dropping in altitude. This is happening in GPS and atti (not tried manual/rate mode, keep that for the 250 for now!) Other than that issue its flying fine.

it Any suggestions what might be causing this and how to sort it out.

There's a video of it here:

Most obvious at about 32 seconds in.

I’ve updated the firmware and reconfigured everything since but the issue is still there.

It’s an S900 with A2 and GH4-Z15 HD, TX is the 14sg with no weird mixes or anything like that going on.

Thanks a lot in advance!

 

[Motopreserve]

It may be simply from the fact that the motors are changing power to complete the yaw - which it looks like is happening rather abruptly.

Have you tried dialing in a bit of expo to the yaw to see if it will smooth out?