Kirk, I fly a LS 8 st which has one of those simple engines, quite like a lawn mower, no starter, no alternator, engine only. To start, the engine is fully extended, equivalent to about half airbrakes out as earlier explained.. I the have to dive start, accelerating to 80 kts. That will be app 500 feet lower than at the beginning of the exercise. If the engine starts, I gain about 300 of those back immediately. How much safety would you put onto those 500 ft? For me the engine extract point is 1,500 ft. If I would fly competition with serious ambitions the engine would come out. There is absolutely no sense to have it.

Rolf