Mayf,
1. Airplanes: If you think that it is not used, then see
http://142.26.194.131/aerodynamics1/Stability/Page3.html
2. Undercar and side shapes: Agree with undercar but sideshape is all I
would use.
3. Windshields: I agree but the side area could concievably be used. Not
much effect though.
Skip (still bench racing pig-headed tho I may be)
At 07:05 AM 9/10/02 -0700, DrMayf wrote:
>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
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