Andrew S. McIntosh & Adrian Lai Motorcycle Helmets: Head and Neck Dynamics in Helmeted and Unhelmeted Oblique Impacts Objective: To assess the factors that contribute to head and neck dynamics in motorcycle crash simulation tests. Method: A series of laboratory tests was undertaken using an oblique impact rig. The impact rig included a drop assembly with a Hybrid III head and neck. The head struck the top surface of a horizontally moving striker plate. Head linear and angular acceleration, striker plate force, and upper neck loads were measured. The following test parameters were varied: drop height to a maximum of 1.5 m, horizontal speed to a maximum of 35 km/h, impact orientation/location, and restraint adjustment. Two helmet models were used for the majority of tests. Visor impacts were conducted as were comparisons across 4 helmet models. Descriptive statistics were derived and multiple regression was applied to examine the role of each parameter. The data were compared to unhelmeted tests.

Results: The tests confirmed that motorcycle helmets compared to no helmet provide a high level of protection to the head and neck through management of both linear and angular head acceleration and neck loads. In the most severe lateral impacts (drop height 1.5 m and horizontal speed 35 km/h): the mean head injury criterion (HIC15) and mean maximum headform acceleration were respectively 648, 150 g for 4 helmet models; the mean +αy was +9.5 krad/s2 and +αx was +5.1 krad/s2; the upper neck resultant force, −Mx and −My, respectively, were 4947 N, −80 Nm, and 55 Nm. Drop height was a significant predictor of peak linear headform acceleration, HIC15, and striker force. Horizontal speed and impact orientation were significant predictors of peak angular acceleration, in addition to drop height. Peak head and neck loads observed in visor impacts were similar to those observed in impacts directly to the shell. Peak head and neck loads observed in frontal impacts with tightly and loosely adjusted restraints were similar, but the helmet with the loosely adjusted restraint was ejected during the impact.

Conclusions: Further research and development is required on the oblique test rig to establish its reliability and validity, the latter through comparisons to real-world impacts. Motorcycle helmets certified to a national standard manage linear acceleration well, but further developments are required to reduce angular acceleration. Within the range of impact conditions, there was no indication that helmets posed a neck injury risk. honda motorcycle dealers bergen county njSupplemental materials are available for this article. givi top box securityGo to the publisher's online edition of Traffic Injury Prevention to view the supplemental file. motorcycle dealers in coquitlam

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reserve has been met DVS or Directional Visor Stability is achieved by providing a 3-point locking system once the helmet is in a closed position. Once the helmet is secured to the head and the chin cup is fully adjusted to the user's jaw length, the helmets visor port remains in a static position and cannot shift whilst riding at high speeds due to the close fit. The aerodynamic lower edge guards against buffeting and also prevents wind entering under the lower edge and lifting the helmet in an upward motion. All Vozz Helmets are manufactured under strict protocols to ensure the quality meets the technology. Vozz has partnered with an International Composite Helmet Manufacturer who is an ISO9001 certified manufacturer. Vozz helmets are subject to strict QA guidelines prior to completion ensuring the best possible quality available in a composite helmet globally. Vozz S.R.S. or Safety Release System has been developed to assist medical staff with a quick and safer removal of the helmet and to enable access to the users head in the event of an accident.

This will be very useful in remote situations where a hospital is some distance away. This is a first for paramedics and will provide a safer alternative of helmet removal within a matter of minutes, without having to cut the helmet off the users head if required. Vozz has developed multiple shell sizes and also EPS liners to ensure the best possible fit to the end user. With a combination of 3 shell sizes and 3 EPS liners and multiple comfort liners the fit will be second to none. Now you will have a helmet that actually fits your head size rather than different thickness of comfort padding being used to ensure a correct fit. Inside a Vozz helmet you will find a world of difference from the conventional pull on, pull off, full-face helmets. The first difference you will notice is the fit, the Vozz helmet fits like a glove, as you slide your face into the opening and secure by way of a fully adjustable chin cup, which is a “Set and Forget Retention System”.