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The skin temperature drops initially as the aircraft climbs due to exposure to decreasing ambient air temperatures. As the speed increases above about Mach 1, where the temperature begins to increase, the skin temperature reaches a maximum of 120°C (248°F) after exposure while cruising at Mach 2.2. (At Mach 2.0, the skin temperature would stay below 100°C (212°F); at Mach 2.4, it would reach 150°C (302°F.)
May be wrong, but I thought heat was proportional to the square of the speed, not pro-rata.
I like daveshorts comments about aerodynamics and the problems of hypersonic flight. Experiments with models could be tried if you launched them from existing orbital vehicles. That could solve the wind tunnel problem.As for possible dangers of frying on the way in, you could come down with a series of skips , rather like dabbing the brakes on an old car with drum brakes. I wouldn't like to be on the first test flight - but the Shuttle isn't exactly a stress free way to re-enter, either.The center of lift problem would, I suppose, call for swing wings.No one said it would be easy!