List
I think there is a glitch in the rolling resistance for the same reason. I
sent an Email to Bruce Bowling and he said he got the formula from a graph
that only went up to 45 psi and he interpolated the rest (wrongly). I have
been using 50 psi under the theory that lower pressures deflect the tire and
higher pressures deflect the salt.
Dave the Hayseed
----- Original Message -----
From: "rtmack" <RTMACK@pop3.concentric.net>
To: "john robinson" <john@engr.wisc.edu>
Cc: "Joe Amo" <jkamo@rapidnet.com>; <land-speed@autox.team.net>
Sent: Tuesday, November 06, 2001 1:44 PM
Subject: Re: frontal area/drag coefficient
> 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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