Thanks Rudeboy. That's exactly the kind of advice I need. I was thinking 6.5-7" dia. and about 5-6" pitch on 6S. I was going to try 4S first, so thanks for reinforcing that idea. I happen to have plenty of 8-7's and 8-8's for my .32's. My motor is a Chinese cheapy, so I doubt it will survive 100+ amps for long. I was planning to try to hold it under 90 amps peak, as it's rated at 75. They're only about $20.00 ea., so a smoked motor here and there isn't a disaster. I've got a 150 amp ESC I was planning to use. What brand of motor are you using?