As the car is the moving body (rather than the air as in most text book examples) I reckon that I should take the air as only moving over the car and not over the ground. This leaves the drag increasing suddenly when the boundry layer reaches the ride height (which if the car is running nose down changes with the distance along the underside of the car) and oh my.... this looks like some horrible differential equation may result.. I'll let you know how I get on. It may take a very long day working on this one (and then once I have a result I will have to incorporate it into my simulink model) oh well. That's the first week of the Uni holidays gone then..
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