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Use And Applications Of The F504 Tester In Existing And Emerging Ski Technologies
Fenlon, Emma
Fenlon, Emma
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Abstract
Skiing injuries to the lower leg have drastically decreased since the 1970’s. This is largely due to standardization around the release and retention characteristics of recreational ski bindings. The 504 tester, developed by Carl Ettlinger, exists in the University of Vermont’s Ski Safety Laboratory and presents itself as a useful tool for quantifying the release and retention characteristics of ski bindings and helps to quantify the risk associated with their use, particularly in terms of lower leg fractures. Although, standardization around binding release has lowered the occurrence of lower leg fractures greatly, there is an opportunity to create a performance standard to inform the release of ski bindings in preloaded scenarios, most closely resembling real-world conditions that occur on hill. Beyond this, there is an opportunity to utilize the 504’s testing capabilities to investigate the release and retention characteristics in new and emerging technologies.The purpose of this research is two-fold: contribute to a performance standard for traditional alpine bindings in preloaded scenarios and compare the behavior of traditional alpine bindings in these scenarios to new technologies such as multi-norm compatible bindings and GripWalk soles. The release and retention characteristics of traditional alpine bindings in front and rear preloaded scenarios were tested and a standard for their performance was suggested. The performance of multi-norm bindings was then tested using various ISO certified boot soles. It was found that multi-norm compatible bindings behaved differently depending on the boot sole they are paired with. Additionally, multi-norm bindings were found to have release behavior that was significantly different than that of alpine bindings. The risk of putting non-compatible GripWalk soles into alpine bindings was also quantified. It was found that this boot-binding combination puts the user at risk for an inadvertent or early release. Overall, it was found that user experience can vary greatly depending on the boot-binding combination and the recommendation remains that all boot-binding combinations be tested by a professional.
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Date
2026