Thanks Andy, I have also got a Walkera 4 which Ihave been flying ( allbe it very basic ). My main concern is the motor surge. I have the throttle trim on minimum and all other trims are on about centre. The PLT is at 12 oclock and and the PIT is on 2 o''clock. The limit and delay are also on minumum. Could it be the receiver or the transmitter. The receiver is very hot after these surges. The heli is brand new.