Safriz
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...you are right...but, is MTCR applicable to newly , jointly developed systems?
"scramjets using huge qty of propellants"??? I might have to re-brush my info. I read that scramjets are the most economical method for supersonic flights....after the vehicle has reached the "threshold " speed, which is attained by a rocket motor.
..I need to update myself.
Out of the many methods of supersonic flight...scramjet is fuel efficient.
But saying that,a supersonic flight itself isnt fuel efficient compared to subsonic flight.