Actually, I think it is hard to predict exactly what direction the air
over the cab is going too. You need to mount this thing on a framework
way out in front of the truck if you want to be able to get credible
results.

I think it would be easier to hang the prototype from a framework out in
the middle of a field, with no obstructions near it. Then wait for a day
with some wind and see what happens.

Kevin Horton

On Mon, 29 Mar 2004 20:46:31 -0800, Corrie wrote:

You'd have to mount it up above the cab - the wind in the back of the
truck won't be parallel to the top and bottom surfaces. It blows off the
back and curves down around the back and blow around and eddy and
turbulate and all that. 'Course, so will real wind.

Mount the contraption firmly, though, and it won't flop around.

(Wright1902Glider) wrote in message
...
Well, the redneck school of engineering recomends that you make a quick
prototype out of poster board/foam board/sheet metal/whatever. Then
mount the sucker in the back of a pickup truck, as it would hang
normally, making sure that its in the free-air stream.

To test, start driving and watch the rear-view mirror. That should
answer most of your questions real quick.

Just a thought,
Harry "10 tie-downs ain't enough" Frey Wright Brothers Enterprises
Wright 1902 glider, 1899 kite, 1878 Bat