I sometimes poke a pin in the bottom(cg) of a scale shape and blow air at it.
On dusty ground might work also. Jack
-------------- Original message --------------
From: "Ed Weldon" <23.weldon@comcast.net>
> Knowledge, time and money (KTM). Sprinkle enough of it on your LSR project
> including a measure to overcome demon randomness and you'll accomplish a
> reasonable goal.
>
>
>
> OK, Mayf pretty well outlines the big engineering problem that we all
> instinctively know requires NASA (or at least Ford Motor Co.) levels of KTM
> to solve. I think most of us prefer a simpler approach that provides useful
> rules of thumb rather than a lot of heavy math. Greg Myers' anecdote about
> the Wright brothers describes the way a lot of us operate. Singular
> datapoints, experiences such as Kieth and Tom describe count for a lot, too.
> Simple experiments like the swimming pool test Neil suggested. (Only a
> Southland guy would suggest that this time of year) (Or are we maybe
> suggstion a new Speedweek event for the motel swimming pools?)
>
>
>
> Personally I like my idea of conning someone else into doing the work to
> their own as well as our benefit. But if that fails? ...build a scale
> moving surface wind tunnel. Will 1:25 scale produce useful results? There
> are lots of cheap plastic car models in that scale. Or maybe larger scale?
> (uh-oh!! KTM again....)
>
>
>
> OK, let's see...here's things to go find:
>
> 1. 6" belt sander and some kind of variable speed motor to run it.
>
> 2. an electric leaf blower
>
> 3. A nice little linear bearing stage to mount the body on and transmit
> aero forces to a spring scale with minimum friction drag
>
> 4. A way to accurately measure RPM's of the sander rollers and 5. below
> (smells like "M"; more on that later)
>
> 5. Tiny can motors like the model train guys use in their locomotives to
> turn the car wheels to match the belt travel speed.
>
> 6. K (knowledge) relative to building a small wind tunnel and application
> of the scaling factors.
>
> 7. some kind of smoke generator?
>
> 8. Lots of cheap plywood
>
> 9. what else?
>
>
>
> Ed Weldon
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