If doing a coast down, what you are goig to get is a relative Cd so to
speak. You list the vehicle configuration and when youchange that config you
make another coast down to see whether or not that helped. I can extract
rolling resistance to a point but have to know car weight on the front axle
and rear. The we can assume losses for tranny, rear end, inertia, etc to get
a truer Cd. But the result is still the same. for comparative purposes. Lots
of work and testing for maybe nothing.
mayf
----- Original Message -----
From: "John Beckett" <landspeedracer@msn.com>
To: "DrMayf" <drmayf@teknett.com>; "List Land Speed"
<land-speed@autox.team.net>
Sent: Monday, January 27, 2003 6:36 PM
Subject: Re: Aero Testing
> OK here's another thought to factor in to the coast down. How big a factor
> is the drag from the brakes, drive line and rolling resistance. Guess it
> would only be important if comparing coast down Cd to a wind tunnel Cd.
>
> JB
/// unsubscribe/change address requests to majordomo@autox.team.net or try
/// http://www.team.net/mailman/listinfo
/// Archives at http://www.team.net/archive/land-speed
/// what is needed. It isn't that difficult, folks.
|