I don't know at exactly what speed range most things are combustible - it would vary greatly depending on air density and the heat-dissipating characteristics of your object. I know the SR-71 Blackbird required the leading edges of its surfaces to be made of titanium - everything else melted. Its cruising speed is +/- 2,100 MPH. So the melting "speed" of most rocks would be somewhere south of that.
But your wind generator already exists. The LENS-X wind tunnel operated by Cal-span University at Buffalo Research Center can generate wind speeds up to 25,000 MPH - that's about 8,000 MPH faster than the Space Shuttle's re-entry speed.
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If you want to avoid 95% of internet spelling errors:
"If your ridiculous pants are too loose, you're definitely going to lose them. Tell your two loser friends over there that they're going to lose theirs, too."
It won't hurt your fashion sense, either.
Last edited by yournamehere; 03-04-2011 at 02:06 PM..
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