land-speed
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Re: Ballast

To: "Smith, Simon-Pierre" <Simon-Pierre.Smith@PSS.Boeing.com>
Subject: Re: Ballast
From: Joe Amo <jkamo@rapidnet.com>
Date: Tue, 03 Jul 2001 02:05:23 -0600
yes, but when it is applied through the wheels
you get to take advantange of all that multiplied
torque from the motor, and that likely pushes
alot harder than any thrust derived from pushing the exhaust
against the air, perhaps that is why Vesco uses it for
downforce......
Joe :)

"Smith, Simon-Pierre" wrote:

> Seems to me that for every pound of downforce you get from your exhaust, you 
>get that much times your coefficient of friction out of your tires.  On salt 
>you'd be better off pointing the exhaust back so you get pure thrust.  
>Remember that the thrust doesn't go through the wheels so it is not traction 
>dependent.  At Maxton I'd figure you can get a friction coeff above 1 so it 
>might be worthwhile pointing it up.
> One other point, if the exhaust is pointed up and is aft of the rear axle it 
>will lighten the front wheels.  This will give it a greater effective 
>downforce on a rear wheel drive car.  Hard to make up for a coefficient of 
>friction of about .5 though.
>
> Simon-Pierre Smith
>
> > ----------
> > From:         Joe Amo[SMTP:jkamo@rapidnet.com]
> > Reply To:     Joe Amo
> > Sent:         Sunday, July 01, 2001 11:08 PM
> > To:   Dan Warner; land speed
> > Subject:      Re: Ballast
> >
> > Here you go Dave, an exhaust
> > collector that is directed up for
> > the acceleration heavy portion of the
> > run, that rotates to or towards a more
> > rearward aspect to enhance drag toward
> > the end of the run.....
> > Joe
> >
> > Joe Amo wrote:

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