the Douglas DC-2000 was hypersonic transport aircraft project,it
had a cruising speed of 6 Mach.
http://www.flightglobal.com/PDFArchive/View/1973/1973%20-%201909.html?search=aircraft%201973
62 DOUGLAS TOMORROW to examine the advantages of externally blown flaps, mechanical flaps, augmenter wings and upper-surface blowing. The results of these studies were compared with those for a 1
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