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#11
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helmet ventilation?
"(PeteCresswell)" wrote in message ... Per Ron Hardin: t's a 1975 Bell mushroom helmet, a pleasant sun-reflecting white with rigid white styrofoam insulation, so it takes off all the radiative solar heat. That's a huge benefit. Riding without it is much hotter, very noticeable. Now you've got me thinking it's the color. Mine's a dark-ish grey. Maybe a little strategically-applied spray paint... Better yet, get some aluminum foil. It's easy to mold and with a bit of 3M spray tack, you can stick it to the helmet. An added plus: aliens won't be able to read your thoughts anymore. Chris - firmly tongue in cheek |
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#12
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helmet ventilation?
Just zis Guy, you know? wrote: It's a good question, actually - I don't know to what extent the body is able to compensate for the reduced cooling. As far as I understand it the scalp plays the major part in cooling the head, and there is evidence in respect of cricketers that helmet-induced heating impairs reactions. I think there are probably as many unknown unknowns as known unknowns here. There is a lot of data on the opposite side. That is by keeping the head warm (via a hat)there is a large positive effect on staying warm. In most cold weather ative sports competitors seem to worry most about losing heat from the head, hands, and feet. And as a result if those areas are covered it seems that they can use relativley light clothing (sans a big wind chill effect) everywhere else as long as activity level stays high. So, I would think that this can be extrapolated to guessing that in hot weather that if the head isn't allowed to cool that overall body temp may rise as a result. |
#13
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helmet ventilation?
Per Ron Hardin:
The cooling effect change isn't noticeable. The huge cooling is from sun shielding, and that's compared even to wearing no helmet. As long as the vents are plugged, wear a baseball cap under the helmet to get a nice visor, very handy in cold wind or rain, as well as sun. Where/what time of year are you riding? I'm in Southeastern Pennsylvania (USA) and in July/August I wind up taking the thing off for 15-20 minutes at a time just because it feels soooooooo good to have the cool wind in my hair instead of sweat running down my glasses and feeling like my brains are gonna poach like an egg. Giro Zen. Somewhere on the web, there's an anti-helmet site whose argument is based in part on injury reduction vs reduced health benefits from fewer people riding after some sort of manditory helmet law was passed in Australia. I'm mostly a helmet zealot, but I can also see his side of the argument. -- PeteCresswell |
#14
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helmet ventilation?
Someone at RMIT published research on this in Bicycling Australia a couple
of years back. Can't remember the exact details, but I think they stuck temperature sensors in/on a headform, heated it, then blew air across and measured the rate of cooling with various helmets (and also with no helmet as a comparison). There was no correlation between price and and how well the helmet allowed cooling to take place. Some of the cheap helmets with what appeared to be poor ventilation were near the top of the list and some of the expensive ones which were mostly slots were near the bottom. And the best of the helmets allowed cooling as rapidly as a bare head. Nick "C.J.Patten" wrote in message ... I won't get in to a helmet debate. I wear one, reasons irrelevant for this thread. My question has to do with vents. My current helmet is a Giro Indicator. This wasn't an expensive helmet but it fits well. When you spend 5 times as much to get something like a Giro Atmos (i gather they use it on the tour?) is the ventilation that much better? Would you notice your head staying that much cooler? |
#15
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helmet ventilation?
Well heck, that's a tease! I gotta find that study!
Thanks for that though... good to know. "Nick Payne" wrote in message ... Someone at RMIT published research on this in Bicycling Australia a couple of years back. Can't remember the exact details, but I think they stuck temperature sensors in/on a headform, heated it, then blew air across and measured the rate of cooling with various helmets (and also with no helmet as a comparison). There was no correlation between price and and how well the helmet allowed cooling to take place. Some of the cheap helmets with what appeared to be poor ventilation were near the top of the list and some of the expensive ones which were mostly slots were near the bottom. And the best of the helmets allowed cooling as rapidly as a bare head. Nick "C.J.Patten" wrote in message ... I won't get in to a helmet debate. I wear one, reasons irrelevant for this thread. My question has to do with vents. My current helmet is a Giro Indicator. This wasn't an expensive helmet but it fits well. When you spend 5 times as much to get something like a Giro Atmos (i gather they use it on the tour?) is the ventilation that much better? Would you notice your head staying that much cooler? |
#16
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helmet ventilation?
On Wed, 13 Jul 2005 08:58:53 -0400, "C.J.Patten"
wrote: My question has to do with vents. My current helmet is a Giro Indicator. This wasn't an expensive helmet but it fits well. When you spend 5 times as much to get something like a Giro Atmos (i gather they use it on the tour?) is the ventilation that much better? Would you notice your head staying that much cooler? The only benchmark that I consider important in this regard is "Do I have enough venilation with the helmet I have now?" If the answer is "yes", then in my opinion, no further expenditure is worthwhile. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
#17
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helmet ventilation?
Per Ron Hardin:
t's a 1975 Bell mushroom helmet, a pleasant sun-reflecting white with rigid white styrofoam insulation, so it takes off all the radiative solar heat. That's a huge benefit. Riding without it is much hotter, very noticeable. Now you've got me thinking it's the color. Mine's a dark-ish grey. Maybe a little strategically-applied spray paint... -- PeteCresswell |
#18
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helmet ventilation?
On Wed, 13 Jul 2005 17:42:19 -0400, "C.J.Patten"
wrote: "(PeteCresswell)" wrote in message .. . Per Ron Hardin: t's a 1975 Bell mushroom helmet, a pleasant sun-reflecting white with rigid white styrofoam insulation, so it takes off all the radiative solar heat. That's a huge benefit. Riding without it is much hotter, very noticeable. Now you've got me thinking it's the color. Mine's a dark-ish grey. Maybe a little strategically-applied spray paint... Better yet, get some aluminum foil. It's easy to mold and with a bit of 3M spray tack, you can stick it to the helmet. An added plus: aliens won't be able to read your thoughts anymore. Chris - firmly tongue in cheek Dear Chris, Actually, the thin metal domes amplify the weak signal sufficiently to be received by our instruments at a muc greater distance and allow us in turn to reach and control a much wider audience. Kang & Kodos |
#19
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helmet ventilation?
Per C.J.Patten:
that's a tease! Amen. -- PeteCresswell |
#20
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helmet ventilation?
Booker C. Bense wrote: IMHO, the big difference between cheap and $$$ is ventilation and weight. Don't forget protection. If you pay $130 for a helmet, it's guaranteed to keep a decapitated head under 300 gees in a 14.01 mph impact. Whereas if you pay $15 for a helmet, that decapitated head may not hit 300 gees until, oh, 15 or 16 mph. OK, it's not a big difference. And nobody will ever tell you the exact numbers. But the difference is there. The more you pay, the less protection you get. - Frank Krygowski |
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