bicycle helmets effective image
Forgetful
There is a "shell" and a "liner" in a bicycle helmet, right? what is the purpose of those things? Is the shell supposed to stop it from breaking or is the liner supposed to be crushed?
Simple language please.
thanks!!!!!
Answer
There are variations depending upon the quality of the helmet and the purpose... for example, some DH helmets are practically MX helmets now but, in general...
Bike helmets have the liner and shell as you've mentioned, the liner actually does the majority of work in saving you from a fall. The shell is really just there to prevent things like stick and such on the tral from penetrating the liner and stabbing you in the head, or to keep the liner from coming apart on hard impacts. The liner is what handles the energy transfer that prevents you from sustaining severe injury. When you take an impact, the liner is supposed to get crushed... in doing so, it converts the kinetic energy (the energy of an object in motion) of the impact into thermal energy (heat) as the liner is crushed. Remember, energy can never be created or destroyed, it can only change forms... The type of material used in the liner and the overall quality of the helmet determine just how effective it is but that's the basic principle in ALL helmets actually. Most common helmets use an EPS liner, Expanded PolyStyrine, and are good for just one serious impact... Once the liner has been crushed, it no longer has the capacity to be crushed much further to allow for the conversion of energy needed to protect your head. Some other helmets use materials that allow the energy conversion to take place repeatedly and only need to be replaced if the shell material is compromised... these are typically MX helmets or very high-end downhill helmets.
Also, it's worth noting that essentially all bike helmets pass the same certifications so there isnt a whole lot of difference in protection between a $40 helmet and a $140 helmet... Most of the extra money that you pay goes into what was spent on R&D to figure out a way to incorporate more vents into the helmet without lessening the protection offered.
There are variations depending upon the quality of the helmet and the purpose... for example, some DH helmets are practically MX helmets now but, in general...
Bike helmets have the liner and shell as you've mentioned, the liner actually does the majority of work in saving you from a fall. The shell is really just there to prevent things like stick and such on the tral from penetrating the liner and stabbing you in the head, or to keep the liner from coming apart on hard impacts. The liner is what handles the energy transfer that prevents you from sustaining severe injury. When you take an impact, the liner is supposed to get crushed... in doing so, it converts the kinetic energy (the energy of an object in motion) of the impact into thermal energy (heat) as the liner is crushed. Remember, energy can never be created or destroyed, it can only change forms... The type of material used in the liner and the overall quality of the helmet determine just how effective it is but that's the basic principle in ALL helmets actually. Most common helmets use an EPS liner, Expanded PolyStyrine, and are good for just one serious impact... Once the liner has been crushed, it no longer has the capacity to be crushed much further to allow for the conversion of energy needed to protect your head. Some other helmets use materials that allow the energy conversion to take place repeatedly and only need to be replaced if the shell material is compromised... these are typically MX helmets or very high-end downhill helmets.
Also, it's worth noting that essentially all bike helmets pass the same certifications so there isnt a whole lot of difference in protection between a $40 helmet and a $140 helmet... Most of the extra money that you pay goes into what was spent on R&D to figure out a way to incorporate more vents into the helmet without lessening the protection offered.
Are bicyle rodeos effective in helping prevent bicyle injuries?
adru09
As we all know bicyle rodeos are programs design to teach children to to safely drive bicyles, wear helmets, check bicycles, etc. Im doing reseach in whether or not these programs actually help prevent these injuries that could happen for the lack of this knowlegde. My research has come out rather dry. I was wondering if anybody had numbers, statistics, or information that could help me out. Please and thank you.
Answer
Well, I don't have any stats, but I do have personal experience.
I did a bunch of bike rodeo events when I was like 9-10, and just starting riding as a real hobby. My parents told me I had to do at least 3 of them before I could ride on the road. They really did help, because they teach you bike handling techniques, and teach you to ride through different conditions like narrow lanes, grass, rocks, etc. They set up an obstacle course at the end, and everyone had 2 chances to get the fastest time without knocking any of the cones down that they used to make the course. It was actually pretty fun, and looking back, it probably did help.
All in all, I say it definitely did help me. I guess it all depends on how much the kids actually pay attention during the class that regulates how effective it was.
Well, I don't have any stats, but I do have personal experience.
I did a bunch of bike rodeo events when I was like 9-10, and just starting riding as a real hobby. My parents told me I had to do at least 3 of them before I could ride on the road. They really did help, because they teach you bike handling techniques, and teach you to ride through different conditions like narrow lanes, grass, rocks, etc. They set up an obstacle course at the end, and everyone had 2 chances to get the fastest time without knocking any of the cones down that they used to make the course. It was actually pretty fun, and looking back, it probably did help.
All in all, I say it definitely did help me. I guess it all depends on how much the kids actually pay attention during the class that regulates how effective it was.
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Title Post: How do bicycle helmets work?
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