As one of my associates in the Space Station Program once said...look for
the blue tennis ball in the box of white ones. He meant thatif you can find
one problem then the proposed solution is suspect. Here is what I think
about tryint to use the weather vane approach o locating the CP. First blue
tennis ball...they don't do it with airplanes. Second blue tennis
ball...method does dot account for under car or side of car shapes. Third
tennis ball...does not account for things like windsheild on open cars. So
here we have at least three things that make the method suspect, so th
eusefullness is really in doubt in my mind. If ya'll like it, then go for
it? But there is no basis in fact for using it. Just opinions and hunches.
Not good engineering in my opinion and we know what that is worth, don't we?
"0"
mayf
----- Original Message -----
From: "Skip Higginbotham" <saltrat@pro-blend.com>
To: "Bryan A. Savage Jr" <basavage@earthlink.net>; "DrMayf"
<drmayf@teknett.com>
Cc: "Waldron, James" <James.Waldron@CWUSA.COM>; <land-speed@autox.team.net>
Sent: Tuesday, September 10, 2002 6:26 AM
Subject: Re: Race bike Stability and Safety
> OK then......weather vane principal. CG is the pivot. How much "variable"
> area (force?) to put aft of the CG so that the moment is strong enough the
> make the vehicle tend to run into the wind and still have enough weight on
> the rear wheel(s) (rear drive) to provide propulsion. It isn't easy to
make
> it perfect........I think that it is easy to approximate though. The
forces
> would add to the effect of the tires trying to make the vehicle run in a
> straight line (airplanes don't get this advantage). Principal certainly
> applies to airplanes and rockets to make them stable....designers seem to
> try to get the drag minimized by making the tail small and retain
stability
> by adding active control systems. We can't do that.....so......weather
> vane? How should I do it and stay out of a wind tunnel?
> Skip
>
>
>
> At 10:16 PM 9/9/02 -0700, Bryan A. Savage Jr wrote:
> >We're talking aeroDYNAMICS here. I'll bet the CP moves around DYNAMICALLY
> >as speed and attitude change.
> >
> >I was wondering, if it was easy then why have several aircraft companies
> >had to modify a design, after flight test showed instability, by
> >increasing the size of the vertical stabilizer?
> >
> >Bryan
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/// what is needed. It isn't that difficult, folks.
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