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June 7, 1947


JAMA. 1947;134(6):545-546. doi:10.1001/jama.1947.02880230055016

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STRAIN ON PILOTS AND AIRCRAFT  The experience of army pilots flying the newest jet fighter planes indicates that, regardless of how well the aircraft are built, the human body is capable of greater strain for very brief periods than the aircraft. Such fighter craft are now being equipped with accelerometers to warn the pilots when a critical strain is being approached. The jet fighters are built to withstand successfully a force twelve times the force of gravity. This is much more than an airplane develops generally while performing acrobatics and much greater than a pilot would be able to stand for more than a few seconds. The accelerometers, however, have shown that in some instances pilots have pulled up to 14 g during acrobatics in rough air; the high speed jet aircraft can develop up to 7 g in turbulence. While these forces are dangerously high, the pilot

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