A hypersonic plane would reduce the time taken to travel between any two places on Earth to just two hours, but fighting the forces of friction is pushing aerodynamics to its limits

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A hypersonic plane would reduce the time taken to travel between any two places on Earth to just two hours, but fighting the forces of friction is pushing aerodynamics to its limits
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Mark J Lewis is at the Department of Aerospace Engineering, University of Maryland, College Park, Maryland, US, e-mail lewis@eng.umd.edu