The story goes like this !! Bought a gaui 425 last November, also bought a futaba 6ex tx and comparable rx ! Had to wait untill Christmas to get the rest of my kit together, but I've only flown it twice as I'm still quite a novice pilot ! But I'm quite good on set up, firstly the tail rudder has been set up in rate mode, but I keep experienceing the rudder having a mind of its own and keeps turning to the right with no input from me ! I then recentre it but it keeps doing it ???????? I even switch to rate mode and it still wants to move when you move the tail, but when its on heading hold the rudder moves as it should untill the servo starts buzzing and the rudder starts moving, my heli is fitted with a align ds520 digital servo and a E-TECH G105 gyro, can any body help with this problem.