Skip Higginbotham wrote:
> Hello Ed,
> Tire frontal area is a really big issue at any speed as drag increases
> greatly with increase in speed and the Cd is relatively high.......but how
> about considering this......the top of the tire is moving twice as fast as
> the car, relative to the wind, and the bottom of the tire is not moving at
> all relative to the wind (no slippage). So if you cover the top of the
> tire, most of the skin drag would be eliminated? Here's one to calculate,
> Mayf. The desired answer might be "How much of the tire to cover?" or what
> is the real drag of an open tire?
> The top of our tires were going 542 MPH at the "5". The top of Law's tires
> were going 700 MPH. Hammond's at 600. I wonder what sonic shock waves will
> do to tire tread...or.....how narrow a tire can we use and still be safe
> from excessive distortion? Seems we had a thread about flexing some months
> ago......wonder what happened? I seem to remember some sensitivity about
> it.....
> Skip (One would think that I have enough to do.....)
>
Skip,
So...if you had a horn pointed backwards as you approached the speed of sound
and
you honked...??
Now I won't be able to sleep ;-)
If the boundary layer comes into play, maybe we should have rotating nose
cones...ok, better stop.
Cheers,
Rick
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