Ed you can buy smoke pellets at aircraft spruce. Other places too contact me
for info Jack
-------------- Original message --------------
From: NT788@comcast.net
> 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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