longitudinally. This has led to experimentation with prone pilot aircraft designs which lies the pilot face down or (more successfully) reclined positions for astronauts. A similar concept, the supine cockpit exists.

Thresholds

The g thresholds at which these effects occur depend on the training, age and fitness of the individual. An untrained individual not used to the G-straining manoeuvre can black out between 4 and 6 g, particularly

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