I changed from an X525 frame to an own-design H-frame. Same motors, props, ESC's & APM2. I've used the X525 aluminium arms but with a ply-box for the center fuse portion of the H. Same positioning of the motors except the center section of the H is about 30mm longer than the 2 arms.
The quad flies fine with roll and pitch normal but it yaws slowly left and right rudder doesn't stop it nor does it cause any right yaw at all. Left rudder doesn't increase the slow left yaw speed. In fact either rudder direction just makes the whole quad get a bit unstable and out of shape.
Very strange, any ideas?
Replies
You could try to tilt the motors 3 degrees per the wiki for large octo configurations. This will give you more yaw authority. Check to see if you have the motors tilted the wrong direction, which will decrease your yaw authority.