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https://en.wikipedia.org/wiki/G-suit
Pressure suit
Application: for the sustenance of the pilot when flying at high altitude.
Consists of: antigravity device , the tensioning device and abdominal compensator. Foam is composed of two single leg and abdominal rubber chambers connected adapters. Rubber chamber consisting of two parts connected by a bridge. For flights to depressurize the cabin (H more than 12 km.) In the chamber oxygen is supplied to mechanical compression of the body. Compression compensates for excess pressure in the lungs.
Main technical data:
It provides overload tolerance - up to 10 units;
maximum working pressure of antigravity device cameras - 1.6 kgf / cm2;
suit operated at ambient T - from 50 to -500 C;
the maximum working pressure in the chambers of the tension device - 2 kgf / cm2
Suit Weight: 3.2 to 3.6 kg. depending on the size