I was talking to the LHS and they suggested a second battery for the retract servo, I was told it is possible for the wheels to get a knock on takeoff and when retracted not lock in causing the servo to keep on running and possible drain the battery. I believe you can use a Y harness running to a second battery and the retracts and cut the red wire running to the receiver so the servo still get the signal from the receiver but draws the power from the second battery…

Anyone done this??, Is it worth it as I had a fairly bumpy grass strip and can see this happening