On Tue, 8 May 2001, Sandy Sandfort wrote:
> I thought up a similar but stealthier version some time back. The corner
> cuts would be on bars that rotate about a horizontal axis. The whole
> assembly would be inside a visual opaque (but radar transparent) cylinder on
> the front bumper of the car. It could be made to look like a water
> container or heavy-duty bumper or whatever. Either the receding or
> advancing portion of the bar's rotation could be behind a radar opaque
> barrier (depending on whether you'd like to subtract or
> add--ridiculously--to your true speed).
And worthless as long as that big flat radiator is sitting there. The
total area of the 'reflector' by a 1/r^4 (it's a reflected wave so it goes
down 1/r^4) needs to be about the same as the front area of the car.
> In either case, most modern radar would be foiled by any difference in
> recorded speed since most of them are set to indicate a speed only when they
> measure several (3-5) consistent reading within a short time span (something
> < 1 second). I've read that radar cannot measure the speed of propeller
> driven aircraft because the radar chokes on the various measurements the
> spinning propellers return.
A radar gun won't be effected by the propellor as long as the gun is
perpindicular to the plan of rotation (ie you'd get some noise from a side
shot from the props since they rotate in that plane, but from a front shot
they'd be pretty transparent).
> > Similarly, appropriately sculpted
> > hubcaps could mess with the radar
> > guns tiny mind.
>
> Yup.
Nope, not enough surface area.
If you're gonna swamp the gun you MUST swamp the RETURN beam, you can't do
that with a reflected wave unless you're looking at a reflector area a
substantial fraction of total frontal area of the vehicle.
Take a look at a Vet and ask yourself why they are the hardest to shoot
with a radar gun? The radiator is at a angle and reflects the beam upward
and the fiberglass of the car only helps.
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Chris Lawson
The Armadillo Group ,::////;::-. James Choate
Austin, Tx /:'///// ``::>/|/ [EMAIL PROTECTED]
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