it is the only suitable shape to travel at more than mach
speed.
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William T. Strike has written:
'Flow properties of an unyawed 10-deg cone for = 1.28 to 1.40 at
Mach numbers of 1.5 to 8'
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The mach number is the speed, compared to the speed of sound in
air. Thus, mach 1 is the speed of sound, mach 2 is twice (2 times)
the speed of sound, mach 3 is 3 times the speed of sound, etc.
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There is no plural for the noun 'mach'; the different levels of
mach are usually shown by a numeral for various speeds, such as
mach 1 or mach 2.
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Maximum speed: Mach 0.96 Operating speed: Mach 0.89