I am with your line of thinking Dave, BUT
with the aero/go fast expertise that the
Vesco's have, it would also seem logical
that they have good reason for their design...
Joe :)
Dave Dahlgren wrote:
> Thinking logically it would seem the down force to be canceled by the increase
> in aero drag. It has to make a lot bigger hole in the air if it comes out 90
> degrees to the direction of travel. If you aim it out the back it will do no
> harm and might fill in the hole to a certain degree that you are making in the
> air. 'Base drag' and all that stuff.
>
> Joe Amo wrote:
> >
> > 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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