That was a silly protest and should have been demised from the beginning. Every
engine has a thrust factor in the exhaust period no exceptions... It has been
well documented and accounted for for decades, most notably in airplanes. Piston
engines account for about 10% of the rated HP in thrust. Where you aim it is
sort of up to the builder!
Dave Dahlgren
glen barrett wrote:
>
> List
> A couple of years ago the issue of Vescos car came up and a protest was
> started by Jim Fueling stating the Vesco car was assisted by thrust from the
> exhaust. I and several others were in attendance at this meeting. Vesco
> proved that the exhaust flow / pressure was not enough to move the vehicle
> at full thrust alone. With any drive to the wheels the vehicle will not
> move. I don't remember the exact numbers but they were very low. Some where
> in my file I believe I have the engineering reports submitted by Don Vesco.
>
> It's like Fueling's Chevy powered streamliner (4 wheels )with one removed
> being called a motorcycle. My feelings on that issue is a motorcycle has two
> wheels unless it is a real side hack racer which there is a class for.
> Lets see what this starts.
> Glen
> ----- Original Message -----
> From: "Joe Amo" <jkamo@rapidnet.com>
> To: "Dave Dahlgren" <ddahlgren@snet.net>
> Cc: "Smith, Simon-Pierre" <Simon-Pierre.Smith@PSS.Boeing.com>; "land speed"
> <land-speed@autox.team.net>
> Sent: Tuesday, July 03, 2001 7:51 PM
> Subject: Re: Ballast
>
> > 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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