The horsepower is at the rear wheel. To get HP at the crank, you need to consider the differential and transmission efficiencies. Since they are purely mechanical, then the efficiencies should be pretty high, maybe 95% each? If so, then the crank HP is about 10% more. As to SAE or DIN, you'll have to figure that out. And remember, this is the power to keep the car at that speed without accelerating. I left off the two refereences also. The first is from Airplane Aerodynamics, 1961, and the other is Fundamentals of Vehicle Dynamics, 1992.
I will post all of this on a web page currently under construction.
t 11:31 PM 3/10/98 -0800, you wrote:
> So...is the ~ 141 HP needed to overcome the drag of the calculated
>variables supposed to be at the wheel, or the crank. Also are these finding
>based on current S.A.E. HP ratings methodology, or the old way as back in
>the 60's?
>
>Rich
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