land-speed
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Re: frontal area/drag coefficient

To: john robinson <john@engr.wisc.edu>
Subject: Re: frontal area/drag coefficient
From: rtmack <RTMACK@pop3.concentric.net>
Date: Tue, 06 Nov 2001 13:44:37 -0600
list:
I think that program may have a glitch in the "rolling resistance" module.  Try
varying onlt tire-pressure inputs and see if the results make any sense.  (Like,
from 70 to 90psi).
Russ mack

john robinson wrote:

> At 12:24 PM 11/6/01, you wrote:
> >The EZ-Hook two wheeled streamliner
> >is   AERODYNAMICS
> >FRONTAL AREA, 3.62 SQ. FT., DRAG COEFFICIENT .1007,
> >so frontal area isnt everything, problem is we dont have wind
> >tunnels to get the drag number down, this is half the frontal
> >area of Goldenrod, and EZ hook was developed in
> >the wind tunnel of Cal Tech!!
> >Joe
> Howdy, running those numbers through the program at
> http://www.bgsoflex.com/auto.html
> comes up with the following : ( do they match any known HP numbers for the
> liner?)
>
> Air Density Computed is 0.00228 (my assumption for this number is 29.4 inches)
>
> Aerodynamic "Drag Factor" is 0.00090
>
> Rolling "Drag Factor" is 286.76639
>
>    Computed Aerodynamic Horsepower Required is 80
>    Computed Rolling Horsepower Required is 246
>    Computed Frontal Lift Force is 73 Lbs.
>
>               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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