Two riders hit hard by an out of control car

[mcshroom]

Wrong. For a helmet to do its 'job' then it is supposed to compress and therefore slow the rate of decelleration. A crack dforms where the helmet fails and, just like a fault line in any other material, the force of the impact is localised to the crack. In the case of a cracked helmet it absobs less (if any) of the force of impact than a helmet performing to it's design.

Of course we haven't touched on how the helmet increases head mass, rotational momentum, or how it introduces snagging points.

 

[jefmcg]

More relevantly, why is this even posted? Somewhere in the world, something terrible happened?

http://goo.gl/maps/To1oE

 

[4F]

Dunno about that. My mate was in a collision last month, smashed his helmet and his collar bone but not his head. We were both happy with the results of the experiment :-)

Give over, if you want to discuss helmets go to the helmet sub forum

 

[akb]

I was wondering when the helmet debate would rear its ugly little head...!

That was horrible, hope they are both ok.

 

[Mile195]

That's awful. Is that another one from Russia? Certainly not top of my list of places to go cycling at the moment...

 

[gaz]

The cracked helmet is cracked because it has done its job, though. It breaks because it absorbs the energy transferred from the impact (instead of the skull absorbing it). The only thing is that beyond that point, the skull then takes the remainder of the hit, which could be a lot or a little depending on the crash.

FYI: If a helmet has cracked it hasn't done is job properly. A helmet is not designed to protect your skill, it is designed to slow down the deceleration that your brain takes when your head hits the ground.

 

[Rob3rt]

That collision is absolutely bonkers :S

Dunno about that. My mate was in a collision last month, smashed his helmet and his collar bone but not his head. We were both happy with the results of the experiment :-)

Take your dross to the helmet debate section!

 

[guitarpete247]

Didn't look like that rider was wearing a lid either. Mug's game that :-/

 

[Kookas]

FYI: If a helmet has cracked it hasn't done is job properly. A helmet is not designed to protect your skill, it is designed to slow down the deceleration that your brain takes when your head hits the ground.

Can't it do that before cracking? Hence why I said your skull takes the remainder of the impact. The helmet compresses, absorbing the impact, until it eventually fails and the head is subjected to the rest. A bit like if you bend a thin plank of wood. It'll snap at a point, but first it bends.

 

[akb]

Hence why

......? ARGH!

As you were.

 

[akb]

Seriously, can we not turn this into a helmet debate please.

 

[Cycling Dan]

Cycling in Russia is like cycling down a motorway the wrong way at night and in the middle lane. I couldn't do it.

 

[Cycling Dan]

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View: http://www.liveleak.com/view?i=10e_1370147365

 

[Buzzinonbikes]

Yep messed up place that. I'm a bit obsessed with Russian (bad) driving videos. Give it a year or two and the UK won't be far off.