>i doubt that anybody would be interested in even a partial explination of 
>the physics involved, so i'll just say that the shape of the rear of the 
>bus needs more attention than the front for any significant change in the 
>resistance to moveing through the air. 
>
>look at dolphins, 747's, the classic tear drop shape, submarines (like 
>the soviet alpha class).
>
>the shapes all have a blunt front and a long tapered tail.
>
>this prevents the low pressure area in the rear from forming.

Then why are the tails the big thing on 911s?  I had a turbo tail on mine
for a while, and I noticed the biggest difference about 90MPH.  I now
have a ducktail, and while it is an improvement over stock, its not quite
the same.  I put the ducktail on for aesthetic reasons - the turbo taile
looked funky since I only have 7" flares...

Thom
-- 
>> When there's a will, I want to be in it.
............................................................................
:    Thom Fitzpatrick                             Transamerica Info Mgmnt  :
:  Systems Administrator                          1860 Howe Ave            :
:  tfitzpatrick@tim.com                           Sacramento, CA 95825     :
:   fax (916) 921-6781                            (916) 565-3346           :
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All opinions expressed herein are mine and not necessarily those of TIMS!