Re: Concorde

From: (Ed Bogart)
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Date:         04 Oct 95 22:52:27 
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In article <airliners.1995.1518@ohare.Chicago.COM>, kls@ohare.Chicago.COM
(Karl Swartz) wrote:

> >Concord stretches at speeds past mach 1. Can anyone elucidate on this.
> >Why does it happen or does it happen?
> As I recall, it stretches roughly 12-18 inches at supersonic cruise.
> This is a result of the high heat, itself caused by air friction.
> Just as the metals in a thermostat expand and contract with changes
> in temperature, Concorde's fuselage expands with heat and contracts
> when it cools.

If I remember my physics of flight class (long, long ago), it is the
compression of the airstream, not friction that causes most of the heat.
This is why the real hot spots are on leading edges where the flow speed
is zero.