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#11
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Cyclist hospitalised
On 04/05/2015 20:37, Rob Morley wrote:
On Mon, 04 May 2015 19:49:48 +0100 Bod wrote: I don't wear a helmet whilst cycling, but I accept it is more sensible to wear one Why? You believe the purveyors of overpriced plastic? You do realise they're only rated to withstand the impact of toppling off a stationary bike, and have been implicated in neck and rotational brain injuries? "Helmets are tested on three anvils of different shapes: The flat anvil is used with a 2 meter drop. The helmet and headform are traveling at 14 mph at impact. The hemispheric anvil, about the shape of a grapefruit, is used with a 1.2 meter drop. (The point load makes it a severe test.) The helmet and headform are traveling 11 mph at impact." A stationary bike traveling at 14 mph? Perhaps some statistics from New York City might change your mind? Statistics from New York City New York issued a statement on their bicycle safety study including these numbers: Bicycle helmets may reduce the risk of death. Almost three-quarters of fatal crashes (74%) involved a head injury. Nearly all bicyclists who died (97%) were not wearing a helmet. Helmet use among those bicyclists with serious injuries was low (13%), but it was even lower among bicyclists killed (3%). -- Dave - The Medway Handyman www.medwayhandyman.co.uk |
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#12
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Cyclist hospitalised
"The Medway Handyman" wrote
On 04/05/2015 20:37, Rob Morley wrote: You do realise they're only rated to withstand the impact of toppling off a stationary bike, and have been implicated in neck and rotational brain injuries? A stationary bike traveling at 14 mph? If you're standing up, hammering something at head height and you drop the hammer, what is the hammer's vertical speed when it hits your foot? Answer 13mph. It is assumed that the head of someone falling off a bike can hit the ground with similar vertical speed because it travels a similar vertical distance. Horizontal speed (bicycle speed) does not alter the vertical impact speed. |
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