The items on my web site have the best available in terms of tire rolling
resistance and aero drag. Yes tire rolling resistance is polynomial in 2.5
power on velocity. but it is a small factor even at speed. Rolling
resistance at the tire pressures we run amount to anout 10% or so of the
total drag.
mayf
----- Original Message -----
From: "Glenn Ridlen" <gridlen@yahoo.com>
To: "Skip Higginbotham" <saltrat@pro-blend.com>; "John Beckett"
<landspeedracer@msn.com>; "DrMayf" <drmayf@teknett.com>; "List Land Speed"
<land-speed@autox.team.net>
Sent: Tuesday, January 28, 2003 5:00 PM
Subject: Re: Aero Testing
> Skip and list
> I was waiting for someone qualified to say it. Coast down gives you the
combined drag....aero, tires,bearings,etc. It is my opinion that the
closer you can get to the speed you need to run the better the data will be.
The higher the speed the higher the aero percentage. Areo drag = the speed
squared. The bearing drag does not increase nearly as fast as aero as speed
goes up. Not sure about tires...think it is more proportional to speed. Hey
Mayf...help me out here before I get in over my head.
>
Glenn
> Skip Higginbotham <saltrat@pro-blend.com> wrote:John, I believe that
coast-down will give you much more than a wind tunnel.
> All you get in a tunnel is the aero component of drag. Coast-down gives
you
> all of the drag effects at once. So then any change that you make that has
> multiple impacts on drag (body, gears, tires, trans, engine?) will be
taken
> into consideration. You just can't seperate them easily. But who cares????
> Skip
>
>
> At 05:58 PM 1/28/03 -0500, John Beckett wrote:
> >Would relative testing show the same results (improvement or lack there
of)
> >weather in a wind tunnel or on the coast down?
> >
> >JB
>
>
>
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