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Experimental set-up. (A) The control parameter was the drop height; the acceleration of the impactor and the transmitted force at the base of the headform were measured. (B) Test Group I consists of off-the-shelf type I helmets. (C) Test Group II consists of type I helmets equipped with an air bubble cushioning liner between the suspension and headform. A basic type I construction helmet model was selected for the drop impact tests.
