"Rex" wrote in message
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Ed Huntress wrote:
"cavelamb himself" wrote in message
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William Wixon wrote:

"cavelamb himself" wrote in message
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Well, get a great big wind tunnel? :^)

Or

Look at the inverted spoilers on the backs of SUVs and old station
wagons.




that's funny because i'm right in the middle of putting ladder racks on
my pick up truck cap. i have an piece of streamlined aluminum airplane
strut that i'm going to use for the horizontal. i was wondering if
that might kinda break the boundary layer. doubt it. hafta check with
a wind tunnel, which i have none.

b.w.
Yarn, about 6 inches long, taped all over teh surface can show what the
local boundry layer is doing.

Now, OBSERVING that effect might be a trick.

Need another truck and video camera to make it work,

Richard

This isn't very hard to do, once you get some practice. I taped yarn
tufts all over my racing ITC Fiesta (yeah, I know -- it wasn't much) in
the mid-80s and videotaped it from another car driving on an Interstate.
I was checking the effects of propping up the rear of the hood, which was
legal in SCCA's ITC class.

Fiestas were neat cars. I raced a ITB Pinto for several years.

Yeah, Fiestas were fun. They would have been neater if they had brakes. d8-)

--
Ed Huntress