HELMETS, unkewl, or COOL!

no shit, and they aint fudging the numbers, it's pure basic physics and
there is nothing suspect about it. exponential acceleration is an
amazing thing, whether it's a weighted object under test or a human
body, the forces are the same and the objects in motion act the same.

Indian Larry died from a fall of maybe 9 feet vertical that impacted his
head. The chief tech at Orlando BMW fell in the dealership parking lot
and was killed earlier this summer in a similar manner; low speed
vertical fall, no helmet headfirst onto concrete. When you put all
that force on to a small impact area, the effect is tremendous. If i
throw a beachball at you, it's no big deal but if i throw a dart at you
with the same velocity, it is a big deal because of the force of impact
is focused more tightly on the point of the dart. The helmet diffuses
the impact energy over a larger area and abosrbs it by distorting
itself, just like the beach ball. the brain box is more like an egg,
brittle and subject to cracking, and prone to bouncing the contents
around.

32 feet per second/per second acceleration in freefall gathers amazing
force in a hurry. in the real world that's not counting any additional
speed from the vehicle putting you into a horizontal impact against a
car, tree, curb, etc. rather than a vertical impact with the ground.
that's why people do get serious injuries in the shower and in other
types of falls of what would not appear to be dangerous distance. it's
not bad if you land on your ass; it is if you land on an unprotected
head.

 

What lies behind the padding is a hard skull that the brain has already
slammed against at impact. Maybe we should wear a helmet between our
brain and our skull. Yea, that's the ticket....

Mike

 

Snell makes their helmets to the same exacting standards as all the
rest: They are made to withstand a 13 mph impact. Gee, that's really
helpfull and oh so comforting.

Mike

 

well, we're growing just fine thank you.
Mike

 

I support a Bill to have a government mandated system of pulleys, rods,
struts, and plates surgically implanted into the skull of the user before
operation of any moving vehicle.

 

Snell doesn't manufacture helmets, they only do testing and their
standards are way beyond DOT which is what the state wants to see.

Tell ya what, lets' do their pointed object impact test; I'll wear the
helmet and you go bareheaded. the results will be interesting to
compare. <g>

in real life, i've had a friend walk away from a car/bike wreck with
only a black eye after his helmeted head went thru the windshield. It
would be a different story if he hadn't had the lid on.

Like i've said, it's literally no skin off my back for you to wear or
not wear whatever you feel like.

 

hey, i know some people like that!
fullstate had that done to his legs recently too.... <VBG>

 

As long as they include levers and switches, I'm all for it.
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Doubtfull a helmet would have made a difference in _this_ case. I
_SAW_ the stunts he was pulling the day before (Saturday). Stupid
shit I wouldn't do. If he was doing the same thing on Sunday, then
I'm certain a helmet would not have saved him.

Agreed. He really was a kewl dude. Wasn't stuckup like the other
builders.

See below.

And some people would rather live their life having someone else tell
them what to do "for their own good".
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Blah blah blah helmet no helmet blah blah blah.

I'm just happy NC decided to change their law so I can decide.


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another factor is that the impact is being distributed over a larger
area, reducing the given psi pressure on the skull at any given point.
the impact zone on the exterior of the helmet may be small, but the
diffusion of that impact is spread out rather than concentrated to just
the actual impact area. this is the other side of protection from the
deceleration rates helping to minimize brain impact against the skull
interior. the external blow can be damaging with out the brain being
slammed. remember the analogy of the beachball vs the dart moving at
the same velocity and striking the object. this is the sharp rock or
curb impact.

the exterior shell is also designed to absorb impact energy and diffuse
it by destructing like a crush zone rather than transmit all the energy
thru to the interior, but we'll ignore that for a minute and just stick
to diffusion effects.

again, the factors work exponentially because you distribute impact
energy over area. a 1 inch square impact on an unprotected skull can,
in a helmet, have the force distributed over an area of roughly
[0.5(4 pi r{squared})]
or a hemisphere of area. that provides a significant reduction in
pressure at any given point.

example: a blow of 200psi on 1 square inch will split your head open.

helmet diffusion factor for a 4 inch skull radius =
0.5 (4*3.14*{4" squared})
0.5 (4*3.14*16) =
0.5(64*3.14) =
0.5(200.96) =
approx 100 square inches absorbing the blow from the helmet diffusion.

the original 200 psi blow is reduced to approx 2 psi by the distribution
of the impact over the hemisphere of the helmet. good old physics at
work. dont' believe it? have someone hit your head with a ball peen
hammer with and without a helmet on. do it with the helmet on first, or
you may not be around to finish the experiment.

snell tests for this sort impact too, but using accelerometers embedded
in head figures.

 

and you snipped the part of my post where i said i don't care what you
wear or don't wear, it's literally no skin off my back.
whatever makes ya happy is fine with me so long as i don't have to deal
with it.

 

That was too long to read, is there anything in there where I can keep the
city code inspector out of my house until I can changout all my 2 conductor
to 3 conductor wiring? I am a DIY and cant afford a master electrician.

 

sorry, wrong post, at least I got the correct author.

 

Because you've said it several times.


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Try "See Tom Run", top poster.
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I am in support of a Bill to require helmet use for the

Good one! I'm sure companies in the helmet industry would support
this. If it passes, I'm buying stock.....

Jim
'04 FXDLI

 

Well, I like to 1) be comfy when I ride and 2) if I should ever have
that "unavoidable" accident then I hope I am well protected.

As for the plugs...I don't want to go deaf, and having some tunes
aren't bad, either.
;-)


--Fullstate

Me and Mah 'Priller!

 

You make a very good point, Bill.....but I'm not sure what the
over-all response of people would be if you polled them to find out
whether or whether not they work on avoidance skills and / or wear a
helmet.

For me and most of my close friends that also ride we do both. We are
constantly talking about rider skills above everything and gear being
secondary.

I just don't think it's reasonable to say that by sheer skill alone
you will never have an accident. There is always the unknown and
unpredictable. I'm not saying that you WILL have an accidents,
though. That's two different arguments.


--Fullstate

Me and Mah 'Priller!

 

LOL Yeah! Let's invent a cranial insert and sell it to the masses!!!

Sounds like a good idea!


BTW - the logic above is still not quite accurate as you have a
difference in deceleration, but most importantly you have some (a
majority?) of the energy that would have otherwise been transferred
through the skull to the brain dissipated through the helmet.


--Fullstate

Me and Mah 'Priller!