[Impact of the helmet display on head movements against the flying G-loads]

Purpose of the study was to evaluate impacts of the mass added by the display mounted onto the helmet on head movements during 30-s flying +Gz from 2 to 6 units growing at the rate of 0.6 u/s. Increase in the total helmet mass and asymmetric placement of the display had a negative effect on g-tolerance and distorted head movements. G-tolerance (attested by the feeling of discomfort) was found to correlate with display asymmetry the extreme magnitude of which can be determined from a pre-set g-load value.