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Non-Tech : Aerodynamic technology and clever usage ?
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From: Arthur Tang2/13/2007 9:18:51 AM
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Cruising speed?

There is a sound barrier at 660 mph or Mach 1.012. Above the speed creates a sound barrier, there will be a sonic boom on the land, when sound barrier is released. So cruising speed of 650 MPH may be a consideration for economical transportation.
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