On Feb 7, 10:51 pm, "Robert Striemer" <rjstrie....TakeThisOut@shaw.ca> wrote:
> This is an interesting "debate" - Snell vs. Motorcyclist.
>
> Dexter Ford of Motorcyclist did a piece on the Snell 2010 standard in the
> February 2008 issue. Read it. The original expose' below was published in
> 2005. This is very important information if you believe in Snell ratings or
> you are shopping for a new lid (especially if you are looking for a helmet
> for a smaller head - kids) or if you just want to save some cash on your
> next helmet purchase.
>
> http://www.motorcyclistonline.com/gearbox/motorcycle_helmet_review/
>
> the don't trust Snell reaction:http://luckyll.blogspot.com/2008/01/i-dont-trust-snell.html
>
> Hearing Protection Reviews. A better earplug for '08?http://www.webbikeworld.com/Earplugs/disposable-ear-plugs.htm
>
> Rob
> KLR650
Just a little additional info. The Loudon Road Racing Series (LRRS)
has specific requirements for helmets.
"Helmets
Polycarbonate helmets are not allowed.
Helmets may not be more than 5 years old as determined by the date of
manufacture in or on the helmet.
Helmets must be full coverage with an attached face shield. Tear-off's
are not
allowed. Quick release helmet straps are also not allowed unless
original
equipment. The helmet must meet DOT plus Snell approval or the British
Blue
Label standard BSI 6658 Type A helmet standard or the European
ECE22-04 &
ECE22-05 P standard. The appropriate stickers must be attached. Any
helmet
that has been damaged or suffered a severe impact must be replaced or
sent
to the manufacturer to be inspected. All helmets must pass tech
inspection.
The riders number must be displayed on the helmet."
There are a number of polycarbonate helmets that are Snell certified,
but the club has banned their use. It is not a snob thing but was
done because the polycarbonate helmets were over-represented in
observed head injuries at the track. I don't think it has anything to
do with the shell bouncing back into shape, since any added force from
that would show up as G forces in the drop tests. The best we can
figure is that it is from the plastic sticking to the pavement and
imparting a rotation when you hit the pavement. That would not show
up in the drop tests because they don't include any horizontal
motion. As you can see the club does allow helmets that pass BSI ore
ECE standards, so you can go that route if you choose to. You'll
notice it is against the rules to add a quick release to the strap.
We had a few of these break causing helmets to come off.
The other club that I race with is the United States Classic Racing
Association (USCRA). They require helmets that meet Snell M2005 or
the latest BSI/ECE standards. They do not have any rule against
polycarbonate helmets so long as they meet the required standards.
Best I can tell the reason neither club will allow helmets with just
DOT certification is because there is no verification that the helmets
do in fact fulfill the requirements of the standard.
For those that say the high G's of the stiffer helmets don't matter
when taking lighter hits that are more typical, the G's are
proportional in lower force impacts as well. IOW in the lighter
impacts the softer helmet will transmit fewer G's than the stiff
helmet as well. And despite what the guy from Snell says, it only
makes sense that lower G's are always better than higher G's even if
the higher G's are below some arbtrary limit.
As for those that say the top shelf helmets are worth the extra bucks
because of fit/finish/vents/padding/sound or whatever feel free to
spend your money. I have found less expensive helmets that are
perfectly comfortable and quiet.
Two things I personally try to steer clear of when buying a helmet are
ones that have seriously weakened the chin bar with vents, and ones
that have protrusions that could catch and spin the head when
sliding. And I wont pay a dollar extra for special graphics or the
signiture of some racer on the helmet.
My current helmet is a Z1R with a composit shell and Snell
certification. They don't say what the composit is, but it doesn't
say polycarbonate so I can use it to race with either of the clubs.
Prior to that I used a HJC, not sure of the model but I think it was a
CL-12. I do know it had a polycarbonate shell and was Snell
certified.
BTW, it is my understanding that the main reason polycarbonate helmets
didn't get Snell certified in the early days was because they would
stand up to some of the solvent tests. If you painted a polycarbonate
shell it could become brittle and crack on impact.
It would be nice if one of the standards required the listing of the
actual G's observed when the helmet is tested rather than just giving
a pass or fail for some threshold. If that were done I think there
would be a rapid reduction in G forces while still maintaining the
ability to deal with a hard hit.
Bruce Richmond
>> Stay informed about: Safety First? Snell vs. Motorcyclist