Bresch, Thank you for the reply. If, you look at the video when I run the motors using servo tester the plane hovers correctly. In the backyard the plane still behaves the same (left motor high, right motor low, tail motor high). My GPS broke so, at this point I am running without the GPS until the new GPS is delivered. The AIRFRAME is for QUAD VTOL PLANE. I modified to tricopter i.e (2 front motors, 2 front servo and one rear motor (non-tilt) in hover).
When I transition to forward flight the control surfaces and planes behaves in a predictable flight envelope. having said that I have not maiden this plane. On the ground forward flight looks good. Just the hover is giving me headache.
Can you suggest how to fix negative YAW?
