Helmet strength.

From a friend who is a motorcyclist and a target rifle shooter, currently
doing a stint in Iraq with the TA as a medical officer:

A .22 subsonic round will, from fairly close range. A .22 supersonic or
any larger calibre round will from any reasonable range ie range at which
a decent shot would expect to hit such a target. This is provided the
angle at which the round struck the helmet was not so shallow as to cause
it to glance off. Interestingly, yesterday we had a soldier admitted who
had been shot at, probably with a 7.62mm round. It hit the front of his
(kevlar combat, not motorcycle) helmet, penetrated the helmet and his
scalp. circled round the outside of his skull under the skin, and exited
from the back of his head, leaving a dirty great exit hole in his helmet!
If anyone want to donate motorbike crash helmets for a video of different
calibre rounds hitting them, I might be up for it!


While this test may be amusing, I'm not sure how we'd go about the
logistics of collecting old lids and delivering them to Scotland where she
lives

Regards, Ian

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, ogden

**** off, you selfish ****.

We demand the right to mock!

--
Wicked Uncle Nigel - Podium Placed Ducati Race Engineer As featured in
Performance Bikes

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 OMF#6 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha Vmax Honda ST1100 wiv trailer

 

Heh. reminds me of the Simpsons epispde where everyone is firing
pocket Derringers; the bullets simply riccochet off everything,
including windows...

 

Yes, you bastard. We've all laid ourselves bare on here to our
failings.

Spill !

P.

 

As I said, it's not something I'll be describing in detail on ukrm.
Believe it or not, there are bigger things to worry about than a few
sarcy remarks on a newsgroup. And not every crash results in a good pub
tale.

Mock all you want, it's not happening.

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, ogden

Ooh, precious.

OK, anyone else got the details?

--
Wicked Uncle Nigel - Podium Placed Ducati Race Engineer As featured in
Performance Bikes

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 OMF#6 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha Vmax Honda ST1100 wiv trailer

 

Wicked Uncle Nigel says...

It's Ogden, do we really care?

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, Lozzo

Well, *I* might find it mildly diverting.

--
Wicked Uncle Nigel - Podium Placed Ducati Race Engineer As featured in
Performance Bikes

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 OMF#6 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha Vmax Honda ST1100 wiv trailer

 

I can't imagine it'll be terribly interesting. It's ogden, after all.

 

Well, if anyone has an old helmet[1] they could get to EoSM, I can destroy
it with various calibres.

[1] Insert WUN/ToG joke of choice.

 

So how do you explain my helmet? Dropped, a bike falled on it and ~100
blows with a shovel. Still uncompromised?

How you you explain GRP boats? People stamping all over them for
decades, spars being dropped on them, the occasional collision, banging
against pontoons?

 

Good repairs and paint. Take a look at an old kayak, never painted, to see
what actually happens to the structure of grp, kevlar or cf.

 

The hypothesis is that GPR becomes dangerously weak after one light
knock.

I don't think everytime someone drops the kite pole on a GPR boat that
a repair is required.

.....and that doesn't explain my helmet which has had no repairs and is
still solid as a rock after a shed load of shovel based abuse.

 

Not at all. I are mostly an equal opportunity perforator.

 

How do you know?

The worry is about small, heavy things being dropped on CRP.

 

Well I know the first 99 didn't compromise it in any meaningful way.

Happens on boats all the time. I dropped a car bettery once.

 

skrev:

Okay - stick your head in that helmet - go out and have a crash.
If you survive without brain damage and the helmet has stood up
to knocks and bumps and is visibly crashdamaged your theory will
be proven. All other outcomes are your funeral - literally.

 

Wouldn't it be wiser to *simultate* an impact with something like, err,
a shovel?

Which I've done.

.....and the helmet has stood up pretty damn well.

I think there's a fundamental misunderstanding of GRP from the 'helmets
are weak as egg shells' brigade.

 

I can't help but feel that you have a fundamental misunderstanding of the
manner in which helmets fail, not to mention the forces involved.

Try bouncing your head off the road at 40mph from 6 feet up and I guarantee
you that the impact forces involved are an order of magnitude greater than
you and your shovel.

You may be twatting the thing with a shovel as hard as you like and not
seeing it crack in two, but I promise you it would fail in a high speed
impact that a virgin helmet would survive.

 

Ditto. When I slid ungracefully off the car bonnet onto my nut, dome
first. I suppose I should be grateful the helmet/clavicle interaction
saved my brains.

w4et, ateayt[e5r, -aber-w86tqw4tbwdgh. Eh?