RE: Automotive Aerodynamics [WAS:90 90q

[paul.heneghan@bbc.co.uk (Paul Heneghan)]

Thanks for the info Tamas.

Just one question.

I calculate that for an Audi90 at 125mph (55.9m/s), the drag will be 1366N 
(using Cd = 0.39 and FA = 1.87).

The power to move the car at this speed against this force is P = F x V

This gives 76kW.

Most engines for cars that can do these speeds are putting out about 100kW. 
 Surely 25% cannot be lost in friction?

Any suggestions?

Paul

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From: Bertenyi, Tamas

Ok, well since you asked...I'd love to go on about automotive
aerodynamics! To begin with, let me give you a few more drag figures.
<snip>

Audi 90/2.0 E,      Cd=0.39, A=1.87m^2

<snip>