Kelly Johnson was a young engineer who started working at Lockheed in 1933. He designed the Lockheed A-3 that broke mach 3.
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Mach 1 is the speed of sound about 760mph.
Frantisek Mach is 6' 1 1/2".
Mach is the coefficient of the speed of sound, so Mach 1 means you are travelling at 1 x the speed of sound.
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.
Mach 1 is about 762 mph, so mach 20 is about 15,240mph.
Speeds faster than Mach 1 are measured in multiples of Mach, such as Mach 2 (twice the speed of sound), Mach 3 (three times), and so on. Each Mach number represents the speed of an object in relation to the speed of sound.
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.
Mahha GoGoGo - 1967 Mach Five vs- Mach Five Part 1 1-22 was released on: USA: 1 December 1967
Mach 3 is 2283.6211 mph because Mach 1 equals 761.207033 mph.
Mach 1 per second is 230,281,663 feet per second.