Roger, makes sense to me. When it comes down to brass tacks, I might have to spend the money on a couple of props and experiment (see what performance I get on ground runs). I'm still considering a couple larger motors as well including an EME
http://www.milehighrc.com/gas_motor.html would LOVE to put the 70 twin in there, but at 9 3/4" cap to cap there's NO WAY that one would fit. Electric starters are tempting ��