Tag Archives: Condensation Clouds

16 July 1969, 13:33:06 UTC, T + 1:06.3

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Apollo 11 goes supersonic at T+1:06.3 (NASA)
Apollo 11 goes supersonic at T+1:06.3 (NASA)

16 July 1969:  At 1333 UTC (9:33 a.m. EDT) one minute, six seconds after liftoff, the Apollo 11/Saturn V reached Mach 1 at an altitude of 4 miles (6.4 kilometers). As it goes supersonic, condensation clouds, called “shock collars,” form around the S-II second stage.

© 2015, Bryan R. Swopes