Hi John,
Yes, but the fronts are in-line inside (for the most part) the 25" cylinder
and powered (long story there!!!). Fronts are 24.5" dia rears are 30" dia
M/Ts. rear wheel box is 34 X 25. 25" cylinder is inside the rear wheel box.
Then add a little fin. Doghouse on top of the cylinder is effectively 0. It
reduces in c/s as the rear wheelbox increases (sort of like a coke bottle).
Bottom 20% of the rear tires are uncovered as they are not very draggy
(relative speed). Fairings for front headers are not in the calculation and
might get it to 7!
The other big thing about drag besides frontal area is the Coefficient of
drag....hard to determine the number.
Skip
At 02:50 PM 11/5/01 -0600, john robinson wrote:
>6.8? is that with the rear wheel fairings? what size tires? space between
>front tires? rear?
>
>At 02:37 PM 11/5/01, you wrote:
>>Mine is 6.8 sq ft. and made out of a cylindrical tank. Front tires inside
>>and rear in fairings.
>>
>>Skip
>>
>>
>>At 10:32 AM 11/5/01 -0800, Richard Fox wrote:
>> >I know absolutely nothing about this, but frontal area is a big part of
drag
>> >I suppose and 7sq. ft. sounds like alot. But I don't know. Anyone have some
>> >numbers to compare to? Rich Fox
>> >-----Original Message-----
>> >From: john robinson <john@engr.wisc.edu>
>> >To: DrMayf <drmayf@teknett.com>
>> >Cc: land-speed@autox.team.net <land-speed@autox.team.net>
>> >Date: Monday, November 05, 2001 09:20 AM
>> >Subject: Re: What's Up?
>> >
>> >
>> >>I'm here, been putting pixel to screen, drawing my streamliner.... front
>> >>wheel drive front wheel steer staggered rear wheels....right now about 7
>> >>ft2 frontal area.... trying to get it lower....which do you think is
>> >>better, slightly rounded body panels but still a rectangle? or swoopy
>> >>"trout" looking? is lowering the body between the wheels and making wheel
>> >>fairings better from a C/D standpoint (ala "Red Head" ) or shaped like the
>> >>Feuling with a rectangled squarish shape?
>> >>
>> >> John Robinson, Mechanician
>> >
>>
>
>
> John Robinson, Mechanician
> Mechanical Engineering University of Wisconsin
> 1513 University Ave.
> Madison, Wi. 53706
> 608-262-3606
> FAX 608-265-2316
> Current World Land Speed Record Holder
> Bonneville Salt Flats
> H/GCC 92 cu.in. 1980 Dodge Colt
> 131.333 MPH set 1995
> 136.666 MPH set 1996
> 140.292 MPH set 2000
> 144.396 MPH set 2000
> MPS-PG 441 c.c. 1967 BSA Victor Motorcycle
> 95.193 MPH set 2001
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