Air resistance of crash helmets with visors opened and closed was measured as well as the antagonizing muscular force. The angle of inclination of the opened visor seemed to be an important parameter. Up to 15% of the males and 64% of the females can not match air resistance forces.
In: Proceedings of the 3rd Meeting on Biomechanics of Injury to Pedestrians, Cyclists and Motorcyclists (IRCOBI), Amsterdam, 7-8 September 1976, p. 332-340, 4 fig., 4 graph., 5 tab.
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