![]() In older fighter aircraft, 6 g was considered a high level, but with modern fighters 9 g or more can be sustained structurally making the pilot the critical factor in maintaining high maneuverability in close aerial combat. High g is not comfortable, even with a g-suit. Pilots still need to practice the 'g-straining maneuver' that consists of tensing the abdominal muscles in order to tighten blood vessels so as to reduce blood pooling in the lower body. A g-suit will typically add 1 g of tolerance to that limit. The resting g-tolerance of a typical person is anywhere from 3–5 g depending on the person. ![]() ![]() The danger of g-LOC to aircraft pilots is magnified because on relaxation of g-force there is a period of disorientation before full sensation is re-gained.Ī g-suit does not so much increase the g-threshold, but makes it possible to sustain high g longer without excessive physical fatigue. This lack of blood flow to the brain first causes a greyout (a dimming of the vision also called brownout), followed by tunnel vision and ultimately complete loss of vision 'blackout' followed by g-induced Loss Of Consciousness or 'g-LOC'. If blood is allowed to pool in the lower areas of the body, the brain will be deprived of blood. Black-out and g-LOC have caused a number of fatal aircraft accidents. It is designed to prevent a black-out and g-LOC (g-induced loss of consciousness) caused by the blood pooling in the lower part of the body when under acceleration, thus depriving the brain of blood. ![]() MSF830 Anti-g Suit trousers and cummerbund fitted over a flying suitĪ g-suit, or anti- g suit, is a flight suit worn by aviators and astronauts who are subject to high levels of acceleration force ( g). ![]()
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