I have just built up a trex 500 and while maidening I can not get the tail to stay set, it is moving up and down as well as around, as well at hover the throttle actually slows down when it should be speeding up while in normal. The computer radio is programmed as per instructions, the same radio also flys a trex 6oo with no problems at all. With Idle 1 the head speed is constant. The Gyro is programmed properly and is working in HH mode. It seems to be a faulty bec-esc unit, 2 other people say that as well. Any thoughts, has any one had a bad bec-esc? The Trex 600 is a joy to fly, a very good flyer, I like it much more than my nitro raptor. Thr Raptor has been parked at least for now.