Combination anti-g and pressure suit

An anti-G suit adapted to simulate liquid immersion from the neck to the feet of a wearer thereof and capable of providing for both negative and positive protection during vertical accelerations, which comprises:

• an inner, air-impervious, elastic suit adapted to fit from the neck to the feet over the body of the wearer;
• an outer, air-impervious flexible, non-distensible suit adapted to fit from the neck to the feet over the body of the wearer, said outer suit being joined to said inner suit such that said inner and outer suits define a plurality of air-impervious separate toroidal segments which are adapted to encircle the wearer's body from the neck to the feet, said toroidal segments being stacked one upon another in the vertical direction when said suit is worn in the wearer's normal standing position;
• helmet means adapted to be affixed to the neck region of said suit;
• collar sealing means for preventing any air from leaking between said helmet means and the space between said helmet means and the body of the wearer in use;
• means for introducing respiratory air into said helmet means at a controlled substantially constant pressure regardless of any gross accelerations to which the wearer is subjected;
• means for exhausting exhaled air from said helmet means;
• means for introducing and removing a pressurized gas into each of said toroidal segments, the pressure of the gas being transmitted during use to the body of the wearer through said inner suit;
• and
• means cooperative with said means for introducing and removing a pressurized gas into said toroidal segments for continuously adjusting the gas pressure in each respective segment during use in accordance with the following equation:
• P.sub.s =P.sub.r +(Sg.times.V.times.G)
• where P.sub.s is the gas pressure in each respective segment, P.sub.r is the pressure of the respiratory air in said helmet, Sg is the gravity gradient of the body fluid of the wearer in use, V is the vertical center height of each respective segment relative to an arbitrary mid-chest location (V.sub.o) at which thoracic external displacement due to respiration will encounter an average external pressure equal to internal respiration pressure, and G is the acceleration of gravity, to match the internal body fluid pressures of the wearer encircled thereby in use resulting from vertical accelerations, thereby providing both positive and negative G protection.