On Friday, June 29, 2018 at 2:21:23 PM UTC-7, Joerg wrote:
On 2018-06-29 07:11, jbeattie wrote:
http://www.iihs.org/iihs/news/deskto...er-than-others

There was even a story in the Oregonian in this morning.


I buy mine from Bell. They are quite thorough when it comes to impact
testing.

https://www.youtube.com/watch?v=oBDTCSoi47E

--
Regards, Joerg

http://www.analogconsultants.com/

Bell invented the tested safety helmet. They do a good job for what that is worth - not much. A helmet will help prevent contusions and abrasions in minor falls but they are designed to sustain forces that will break the meniscus holding the brain inside the skull allowing the brain to smash into the skull which is then protected from breaking by the design of the helmet. So rather than the skull giving and reducing brain injuries the helmet can actually increase them.

Actually Mother Nature did a pretty good job of protecting the brain. The skull will crack reducing accelerative forces and preventing brain damage in a better means than a helmet will. Not that I'm suggesting you try that since there is an extremely narrow band of injuries that the helmet was designed to prevent

Bell has invented their new Zephyr and Giro, part of the same company, makes one as well. They are using a newer technology. There are two shells instead of one. The inside shell has less resistance and hence will reduce the initial decelerative forces and reduce the chances of brain damage from concussion. The outside layer has slightly more resistance but at this time one could theorize that the brain has hopefully decelerated enough that concussion is less likely from the higher decelerative forces of the outside layer. These two layers together will pass the safety tests from the various agencies.

They also have re-designed the plastic cage that fits around the head so that if you hit at an angle it allows the helmet to turn on the head unlike all of the old designs which would hold the head rigidly in place possibly hurting the neck. They have also added the function of redirecting sweat away from your brow where it would drip onto your sunglasses.

The only trouble I can see is the cost - $240 for the Bell and $380 for the Giro. Well beyond my present means.

DO NOT believe any of these stupid testing methods. Specialists in traumatic brain injuries are NOT consulted when these testing procedures are written and they are all totally blind to the actual injuries of concussion and its ensuing problems of convulsions caused by the concussion. Also as far as I can make out rather than engineers they are designed by physicists. If there is anything dumber than a physicist applying anything to the human body I can't think of one. (The stories I could tell you about designing things for the military)

I was just lucky to find a neurologist that both knew how to treat traumatic brain injury and to make the treatment cheap enough that I could afford it.