Not Ranked
Jeff,
You know we would be happy to make you a copper slab side car.
As for the heat thing...somewhere around or above Mach 3. Airliners don't use titanium skins and if I remember right the F-16 didn't either. I think it only had titanium leading edges and some composites. If the F-16 goes what? Mach 2? Then maybe titanium skins aren’t needed until beyond Mach 2. The SR-71 reportedly went Mach 3+ and had titanium skins…so Mach 3 or so is my answer. Now I better go ask Thomas to see if I am right!
David
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