Aerodynamic loads on an aircrew helmet during high speed ejection

The aerodynamic loads on fast jet aircrew during an _’ ejection have been seen to result in severe injury. One of several possible mechanisms is believed to be the loads transmitted to the aircrew head through the chin-strap of the,, .flying helmet , as a result of aerodynamic lift on the helmet .when it is exposed to the windblast during the out-of-cockpit phase of the ; * eject&r+Jhe resul~~~om a,programme of work, are I,!P. .I._, reser$e$-$$iiih~e$$y@mic p&s& da+ from ~~~&py&tgy+!, ty$ BQ, ‘hi a. hid&a -V fa&hty, & the speed range 50 to 330 metreslsecond, are used in a complex finite elem&t model of a . . .: typical ejep:on.seat and dummy aircrew in order to . ,pre$i~~~ $I? ,‘forc&“.and momenF,3 likely .m be ‘Expenenced :“in” t& aircrew neck nrrder’ ‘&fIerent ejection scenirios. . The ‘data’ show significant