Encyclopedia Astronautica

American pressure suit, operational 1955. The S-4 was a modified S-2 partial pressure suit, no anti-G, chest bladder incorporated for ease of breathing.

Also incorporated abdominal bladder for individuals who experienced abdominal difficulties, e.g. weak inguinal rings.

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Associated Countries
See also
  • Space Suits To explore and work in space, human beings must take their environment with them because there is no atmospheric pressure and no oxygen to sustain life. Inside the spacecraft, the atmosphere can be controlled so that special clothing is not needed. But in order to work outside the spacecraft, humans need the protection of a spacesuit. More...

Associated Manufacturers and Agencies
  • Sears, William J, A Historical Review of Partial and Full Pressure Suits, Web Address when accessed: here.

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