HIGH ACCELERATIONS IN INTERMEDIATE TRAINING: INCIDENCE OF SYMPTOMS AND AN ESTIMATE OF TOLERANCE TO 'G'.
NAVAL SCHOOL OF AVIATION MEDICINE PENSACOLA FLA
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The incidence of obvious symptoms due to high accelerations in instructors and students was estimated by means of a questionnaire. Roughly one-half had experienced greyout or black-out, and one-eighth blacked out frequently. In a primary squadron there was less black-out experienced by students than at a squadron training in dive bombing and gunnery, where one-quarter blacked out frequently. Fifteen of 16 primary instructors admitted blacking out, almost one half frequently. From what is known of the gs produced by the maneuvers responsible for black-out, the tolerance for g of all of these individuals was less than 6 g, and most of them certainly less than 5 g, applied for not more than 4 seconds. There was considerable ignorance shown as to the causes of black-out and methods of its prevention. About half the subjects did not known how their tolerance to g could be altered. Author