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Well one reason could be that Champ Cars only race on highspeed ovals 2 times a year, so there is less chance of a crash, and i think i remember Michael Andretti stating that last year the field was just so experianced for the most part that there was less of a chance for a crash. And finaly, the CART cars don't run nose to tail like the IRL cars so there again, is less of a chance of a crash.
As for the actual aero dynamics...dunno!
Um as from a very very very un-informed opinion removing the flat bottoms and sucking the cars to the ground could work maybe? (Wasn't that why the 956s et al didn't flip down Musslane straight ub the 80s?)
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