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It doesn't look to me like it's an issue of aerodynamic lift, but simply the wheels digging into the ground enough to "trip" it & start it rolling.
If my understanding's right, instead of rolling when sideways, it would have lifted up off the ground first, once sideways. I don't see any lifting in that video - just rolling. If you can find the video of that RX-7 at Bonneville, I think that one lifed off, THEN did the somersaults, etc.
EDIT: Just remembered, I think the rules actually specify 3/4" high. That's another thing I thought was odd - not 1/2", not 7/8", but 3/4".
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Last edited by wmjinman; 11-20-2013 at 04:05 AM..
Reason: Thought of something else
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