This may be a little off subject.
Here is an interesting read based on research presented at the May 2003 ISSS Congress held in St Moritz, Switzerland and, recent data on fatalities in the U.S. for the last twelve seasons.
Click here for full pdf presentationhttp://www.nspgvr.org/region/Helmet%...iew%202003.pdf
Some Interesting Conclusions are listed here. The last statement below is the most interesting.
Speed Results: (all differences significant beyond p=0.005, F-test)
• Skiers faster than snowboarders; 3.5 mph
Skiers (44.5 km/h)> Snowboarders (38.9 km/h)
• Helmeted faster than non-helmeted; 3.0 mph
– Yes (45.8 km/h)> No (41.0 km/h)
• Good visibility faster than poor; 5.2mph
– Good (46.7 km/h)> Poor (38.3 km/h)
Additional Speed results:
• Speeds are highest on ‘Blue Square” trails, not ‘Black Diamond’ or “Green Circle.’
• Skiers go faster than snowboarders,
• Persons who use helmets go faster than those who do not use helmets,
• When visibility is better, people go faster
• Males are faster than females,
• Intermediate and Advanced skiers go faster.
Implications of Helmets
Average speed of 43.0 km/h (26.7 mph) under all conditions well above the design evaluation criterion of 22.6 km/h (14.0 mph) for helmets.
• The kinetic energy at 43.0 km/h is 3.6 times greater than 22.6 km/h.
• For the upper 16% of persons on slope, the kinetic energy is more than 5.8 times greater.
•~35% of the population now uses a helmet,
Have helmets made a difference?
The overall fatality rate has marginally decreased (p-value = 0.06);
• Skier as well as Snowboarder fatality rates have not significantly changed (if anything each is slightly higher).
• The overall marginal decrease is due to the increased number of snowboarders and the decreased number of skiers.