thanks-yes, it had gone through my mind that a better solution, irrespecttive of this problem may well have been to use the additional channel as you suggest. The Life as you correctly say is around the 7.2 volts at full charge- suspect though that the inbuilt tolerance of the chip would have taken that voltage.....looks like we are wrong. My F3d model had only one servo serving the two ailerons and the circumstance was therefore quite different. thankyou for your help, THnz