Kevin,

Interesting that you got yours to do anything at all right at spoolup. Mine wouldn't move until I got up to about half throttle, and I always figured it was due to the small inlets. I never had ground handling issues on takeoff, but I use a little toe-in on the mains. Based on my own experience, I would think you'd need more than 150' for takeoff. Then again, mine have always been laden with extra stuff. The P-80 powered one I'm building now will probably not need a lot of runway for takeoff, though. Hehe.