>>>I don't know why the Concorde doesn't seem to have the same problem.
Perhaps because it "only" goes a bit over Mach 1.<<<
<pedant mode on>
Actually, it goes over Mach 2 (and sustains supersonic flight without
afterburners!) (1450MPH@45k'-55k') Also, the skin is polished
mirror-smooth to minimize friction, but it still gets quite hot in the
rarified air (don't have exact temp figures on hand).
</pedant mode off>
<Obligatory OM content> The Concorde's four engines are made jointly by
Olympus/SNECMA. So there, I tossed in "Olympus" for good measure <G>
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