I have impressed my self, calc in earlier post of mine gives force at 150 mph as well give 40 lb at 60 mph, is the correct as well?


I had a quick look a NASA site with a simple model function - seems easy to make the figures match 40 lb using a plate as opposed to a wing - perhaps too easy.

Separation of airflow is important to consider. As well as providing downforce with a wing the spoiler function could be forming turbulence in the join of airflows over and under the car, so reducing the lift generated by the cars shape.

NASA Foil calc site http://www.grc.nasa.gov/WWW/K-12/airplane/foil2.html

 

I think Rick has solved that one...nice thinking.

Also a consideration - the deeper front spoiler on the SRT will alter the aerodynamics, perhaps requiring the larger area of the fixed wing. I know some testing on the Subaru STI and WRX's showed mismatched wings and front spoilers could great lift at the front and significantly increased downforce at the back as opposed to an equal increase in downforce at the front and back. Imagine that scenario when overtaking at high speed one of those new 40 ft trailers with aerodynamic side skirts and little wheels.