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#41
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Warning: H*lm*t content
This is the thing about helmets, you have an accident and see the damage
done to the helmet. ``Oh thank goodness I was wearing a helmet, that impact would have left me with brain damage.'' That's a very unlikely scenario. People have been falling on their bonce since the beginning of time and it is the minority of those cases which result in brain injury. It's not actually, it's only recently that humans have been traveling at an elevated height along concrete surfaces. A fall onto a natural surface (grass, dirt etc) is usually fine. A fall onto an unyielding surface is not to kind to our relatively fragile heads. And, importantly, it's only recently that we've been moving at greater than running speed. Hit the ground at 20kph and you're okelydokely. Hit the ground at 40kph and you're much more likely to break something important. Not always of course, but doubling impact speed is always going to skew your results more than a touch. |
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#42
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Warning: H*lm*t content
David Trudgett wrote:
If a person adheres to a religion[*] [*] And yes, +everyone+ adheres to a religion, even "atheists". Of course they do. Not believing in God is a religion, just as not believing in the Tooth Fairy is a religion. Theo Avowed Atoothfairianist. |
#43
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Warning: H*lm*t content
Resound wrote:
And, importantly, it's only recently that we've been moving at greater than running speed. Hit the ground at 20kph and you're okelydokely. Hit the ground at 40kph and you're much more likely to break something important. Not always of course, but doubling impact speed is always going to skew your results more than a touch. Err, if you fall off your bike you will hit the ground at approx 20km/h regardless of the speed at which you are travelling. This is the design spec of bike helmets. Should you have a horizontal velocity of 40 km/h you will still hit the ground at 20km/h. However, should you hit a kerb or a post or another vehicle, don't expect your helmet to be of much benefit. Theo |
#44
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Warning: H*lm*t content
"Theo Bekkers" wrote in message ... Resound wrote: And, importantly, it's only recently that we've been moving at greater than running speed. Hit the ground at 20kph and you're okelydokely. Hit the ground at 40kph and you're much more likely to break something important. Not always of course, but doubling impact speed is always going to skew your results more than a touch. Err, if you fall off your bike you will hit the ground at approx 20km/h regardless of the speed at which you are travelling. This is the design spec of bike helmets. Should you have a horizontal velocity of 40 km/h you will still hit the ground at 20km/h. However, should you hit a kerb or a post or another vehicle, don't expect your helmet to be of much benefit. Theo So completely irrespective of the speed at which you are travelling, you'll hit the ground at the same speed? Why do motorcyclists wear leathers then? |
#45
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Warning: H*lm*t content
On Mon, 22 Aug 2005 13:52:37 +1000, David Trudgett wrote:
Religion *is* life, you know. Really, how come I've managed to survive this long without it then? |
#46
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Warning: H*lm*t content
On Mon, 22 Aug 2005 11:31:28 +0800, Theo Bekkers wrote:
As a kid, I did most of my falling off bicycles on brick or cobblrstone surfaces, and, like Euan, I'm not a vegatable either. Didn't do much for your spelling though Graeme (a few helmetless knocks to my head too many) |
#47
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Warning: H*lm*t content
Graeme Dods wrote:
On Mon, 22 Aug 2005 11:31:28 +0800, Theo Bekkers wrote: As a kid, I did most of my falling off bicycles on brick or cobblrstone surfaces, and, like Euan, I'm not a vegatable either. Didn't do much for your spelling though Graeme (a few helmetless knocks to my head too many) Hehe, I think my e key is too close to my r key. Didn't do too well with 'vegatables' though. Spent the whole weekend running fencing wire. Seriously upsets your typing capabilities. My other excuse is my new wireless keyboard. It leaves out or doubles up on letters as is sees fit. Theo :-). |
#48
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Warning: H*lm*t content
Resound wrote:
"Theo Bekkers" wrote Err, if you fall off your bike you will hit the ground at approx 20km/h regardless of the speed at which you are travelling. So completely irrespective of the speed at which you are travelling, you'll hit the ground at the same speed? Why do motorcyclists wear leathers then? Umm, yes, the velocity at which you hit the ground is dependent on the height from which you fell. Your horizontal velocity will determine how far you slide and how much skin you lose from abrasion. Hence the leathers. Theo |
#49
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Warning: H*lm*t content
Euan wrote: ... Dr Dorothy Robinson's concern, instead, is bicycle safety. She has just published a study in the Health Promotion Journal of Australia that is likely to send shock waves through Australian cycling communities with its claim that mandatory bicycle helmet laws increase rather than decrease the likelihood of injuries to cyclists. http://melbourne.citysearch.com.au/profile?id=53571 Personally I'd still use a helmet in winter 'cause it's a handy place to put lights :-) Summer I'd leave the lid behind and wear a sun hat. -- Cheers | ~~ __@ Euan | ~~ _-\, Melbourne, Australia | ~ (*)/ (*) Maybe the annual research report was due and someone was low on publications |
#50
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Warning: H*lm*t content
"Theo Bekkers" wrote in message ... Resound wrote: "Theo Bekkers" wrote Err, if you fall off your bike you will hit the ground at approx 20km/h regardless of the speed at which you are travelling. So completely irrespective of the speed at which you are travelling, you'll hit the ground at the same speed? Why do motorcyclists wear leathers then? Umm, yes, the velocity at which you hit the ground is dependent on the height from which you fell. Your horizontal velocity will determine how far you slide and how much skin you lose from abrasion. Hence the leathers. Theo Ok, that's valid, assuming a dead flat surface wherever you ride a bike...you know, no gutters, rocks, logs, parked cars etc. |
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