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From: good@pixar (All of the good ones are taken.)
Newsgroups: net.cycle,net.auto,net.politics
Subject: Re: re Re Seat belts, Helmets and Freedom of Choice
Message-ID: <2975@pixar>
Date: Mon, 28-Jul-86 16:59:39 EDT
Article-I.D.: pixar.2975
Posted: Mon Jul 28 16:59:39 1986
Date-Received: Sat, 2-Aug-86 08:28:04 EDT
References: <473@water.UUCP>
Reply-To: good@pixar.UUCP (All of the good ones are taken.)
Organization: Pixar -- Marin County, California
Lines: 19
Xref: watmath net.cycle:1888 net.auto:12049 net.politics:17929

In article <473@water.UUCP> kgdykes@watbun.UUCP writes:
>
>>From: junk@ur-tut.UUCP (Jan Vandenbrande)
>When there is impact with the head, the greatest damage comes from
>SUDDEN DECELERATION of the brain against the skull, helmets don't help.

This is the second such claim I have seen, and I'd love to have
someone explain it.  My understanding is that the human head can
safely decellerate at about 80 gees, and that with a good helmet
a 200 gee decelleration can be reduced to below 80 for the head.
In other words, the only thing a helmet really can do is lessen
the severity of a decelleration.  The relative accelleration of
the brain vs the skul has got to be proportional to the accelleration
being applied to the skull by the sidewalk, right?


-- 
		--Craig
		...{ucbvax,sun}!pixar!good