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Originally Posted by The Badger
Maybe the angle of the undertray , when faced into the airflow generates too much lift ? A flatter bottom would not have such an angle , and maybe not generate as much lift . But im just guessing ?
Wheres Mulsanne Mike when ya need him ?
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Mike posted something on ALMS forum. He thought that the cars did pretty well and an old flat bottom car would've flown much further and higher. But he also thinks that there should be a follow up to Piper's '02 study of the aerodynamics at some point.
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Originally Posted by PorscheFanNo1
The undertray of modern LMP cars generates downforce when at an angle (going sideways). With a flat bottom the undertray dont generate any downforce, but the air going over the car will generate lift, so it will take off. The downfroce from the undertray of moderns LMP cars when going sideways should be more then the lift created byt he air going over the car, so it should stan on the ground. But as seen when the cars get a little help from the grass it can still take off.
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According to Piper's study the take off speed for current rules car (chamfered floor, big wing endplates) going sideways is 500km/h. The test were done in a 40% rolling road windtunnel.