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Category :
Languages : en
Pages : 37
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The impact protection provided by a commercial motorcycle helmet is evaluated in this report. The motorcycle helmet utilizes an expanded plastic foam liner of 12 mm thickness, which is less than that used in most motorcycle helmets made in this country today. The thickness of the foam is identical to that used in the US Army Aviator's standard Sound Protective Helmet No. 4 (SPH- 4). The impact protection provided by the commercial helmet is compared to the protection provided by the SPH-4 aviator helmet.
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Category : Aeronautics
Languages : en
Pages : 1040
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Author:
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ISBN:
Category : Aviation medicine
Languages : en
Pages : 478
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Category : Lawyers
Languages : en
Pages : 1514
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Category : Science
Languages : en
Pages : 878
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Author:
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Category :
Languages : en
Pages : 890
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Author:
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Category :
Languages : en
Pages : 0
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The effectiveness of the Army's SPH-4 flight helmet in reducing the severity of head injuries sustained during helicopter accidents was evaluated, using the accident data base at the U.S. Army Safety Center (USASC), Fort Rucker, Alabama. Analysis was restricted to severe (Class A) 1972-1988 accidents that were at least partially survivable, using USASC criteria. Occupants who were not wearing a protective helmet were significantly more likely to sustain severe and fatal head injuries than occupants wearing the SPH-4 (RR=3.8 and 6.3, respectively). Unhelmeted non-cockpit occupants faced higher risks (RR=5. 3 and 7.5). All personnel regularly participating in helicopter flight, civilian or military, should be equipped with protective headgear.
Author: Robert H. Hines
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ISBN:
Category :
Languages : en
Pages : 29
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Impact protection during a crash is one of the primary functions of a flight helmet. In order for the helmet to provide effective impact protection, the helmet must remain firmly secured on the head for the entire duration of the crash sequence. If the helmet is displaced on the head or comes off during the crash sequence, cranial exposure and subsequent head injury can occur. Previous research at USAARL has shown the retention assembly of the SPH-4 flight helmet often allows excessive helmet rotation or even helmet loss to occur during a crash. This report describes the construction and testing of a new SPH-4 retention assembly, the USAARL yoke harness, which will alleviate the helmet rotation/helmet loss problem. The load versus elongation under load and comfort of the USAARL yoke harness was compared to that of the currently used standard retention harness. The USAARL yoke harness was stronger, and stretched less under load than the standard retention harness. Comfort testing of the USAARL yoke harness showed the majority (72 percent) of those questioned preferred the USAARL yoke harness over the standard harness. Keywords: Impact protection, Helmet, Yoke harness, Retention harness, Retention assembly. (sdw).
Author: Australia. Federal Office of Road Safety
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Category : Bicycles
Languages : en
Pages : 180
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A postcrash investigation of 329 Motorcycle and Bicycle crashes involving head injury using police, hospital and Post Mortem data and damage assessment of the protective helmets worn in the crash. Experimental research into skull bone strength, transmission of impact force from the lower jaw to the intracranial space, properties of protective helmet lining materials and headforms for helmet testing. Laboratory simulation of sliding and rotational accelerations of the head indicate a need to revise the Australian Standards for protective helmets to provide improved protection to facial and temporal areas, to soften protective helmet liners and improve sliding properties of helmets. The optimal requirements for childrens bicycle helmets need to be defined in terms of helmet mass stiffness of child skull bone. Bicycle accidents. Injuries. Motorcycle accidents. Standards. Bicycle helmets.
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Category : Helmets
Languages : en
Pages : 248
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