on my first test runs craft behaved too erratic.. because of the light weight, and powerful motor, excessive nose tipping was a great head ache.. because of this nature, control was almost impossible at high speeds.. so back to work table.. and added two more thick ridges on bottom.. still she was not tamed.. so i used a head lock gyro, and an active stabilization system on it.. the active stabilization is based on a servo driver.. explain later.. so she became super responsive.. at any speeds.. and i reduced the prop pitch a little, and worked well..