title: Determining aircrew helmet size design requirements using statistical analysis of anthropometric data.
abstract: Traditionally, the number of aircrew helmet size rolls has been determined using head length and breadth for specified percentile ranges of a target population. Helmet mounted display technology will require taking the third dimension (pupil-vertex height) into account. Using data from "An Anthropometric Survey of 2000 Royal Air Force Aircrew, 1970/1971," the three head dimensions of length, breadth, and pupil-vertex height were plotted for each subject. A minimum number of helmet sizes was calculated to achieve a reasonable quality of fit. The 93.5% of subjects grouped around the population mean was the largest fraction which had a reasonable quality of fit while using nine sizes. Attempts to fit a larger percentage would require either a large increase in the number of sizes or a relaxing of fitting quality.
authors.affiliation: Altitude Division, RAF Institute of Aviation Medicine, Farnborough, Hampshire, England.
authors.forename: A C
authors.initials: AC
authors.lastname: Sippo
authors.forename: A J
authors.initials: AJ
authors.lastname: Belyavin
mesh_terms: D000337:Aerospace Medicine; D000886:Anthropometry; D004867:Equipment Design; D006260:Head Protective Devices; D006801:Humans