This might be a good alternative for Electric C/L engine control. Instead of using a Timer (and the bother of programming it) just plug the motor controller into a feather weight receiver (same as in an R/C plane) and you have the advantage of speed control as well as controlling when the motor stops yourself (and starts of course) = Win Win Win

I have been thinking of building another Stunter (for sport flying only) and reckon I will try the Pistol grip controller idea (as above ^^^) as having a trigger controlled engine "Start, Speed and Stop" on the handle sounds cool