what's wrong with making some kind of "multipier" to scale up the speed. I'm thinking something along the lines of a funnel of know crossectional area which tapers down to a tube of known smaller crossectional area. Hoping that compressibilty is somewhat neglibile (or calcuable) then the car could could be doing 50, and the air in the narrow portion of the tunnel doing 100, or 200. Obviously such a device would need to be mounted, but could be easily made and used. My two cents, Des >>> Mark Willis 5/8/99 2:26:57 pm >>> Roland Andrag wrote: > > > I've been thinking about calibration; Borrow time at a campus wind > >tunnel, for higher speeds? (Borrow a friend with an airplane? ) > > What happened to the car window? Or get up on the back of a truck.. Assuming > you can hold the plane, that is... Take off the wings - use only the > fuselage... > > Cheers > > Roland Andy mentioned that it's a model JET aircraft. IIRC some of those, years ago, used to really move rather quickly (something like 200+ MPH.) I don't want to be in the back of a pickup, doing 200 MPH, relative to wind OR ground Mark