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See, I think the point of helmets is to cushion the impact around ones head, and even break, so as to absorb more of the impact. The reduction of impulse slows down the rate of acceleration experienced by your skull.
To test the difference get a normal helmet, this aluminum helmet and a hammer. Put each helmet on and strike the helmet with hammer. Note which causes more pain. Reply
To test the difference get a normal helmet, this aluminum helmet and a hammer. Put each helmet on and strike the helmet with hammer. Note which causes more pain. Reply
@jodark: Perhaps this was intended as a demonstration of the milling machine's impressive capabilities, rather than the production of a useful product? To bastardize that great automotive engineer René François Ghislain Magritte, "Ceci n'est pas un casque."
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@snapoversteer's profile on Sikes's website has a misleading picture: well, that is certainly important!
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@snapoversteer's profile on Sikes's website has a misleading picture: Yeah, that's gotta be more effective than a tin foil hat, grounded or not.
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@Turbineguy - now with reheat!!: I think they've just taken tinfoil hatting to the next level.
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@jodark: Really, I'd say it depends on the padding and such put into it. You'd be surprised at how much can be damped out by an inch of foam. I do a bit of recreational sword play in the SCA, and our helmets (Stainless steel usually) only have an inch of foam, and there really isn't any pain, even with big muscular guy going full strength to the head.
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@kojiroshinkara: Sword play vs bouncing down a highway at 70mph? The latter is why crash helmets need to have some flexibility (no matter how much foam you put inside): to absorb some of the shock.
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@TowMe: I don't get your point. Felipe Massa was injured in a freak accident by debris (a spring) bouncing off the track and passing through the visor space of his helmet. Space that would be cut out of any helmet, regardless of its material.
As you can see from the picture of Massa, the helmet even absorbed the impact of the spring, whereas an aluminium helmet would have radiated the entire impact-shockwave through to his skull. That it impacted the helmet means some speed would have been taken off of the spring before it hit his face. It could have been so much worse. Reply
As you can see from the picture of Massa, the helmet even absorbed the impact of the spring, whereas an aluminium helmet would have radiated the entire impact-shockwave through to his skull. That it impacted the helmet means some speed would have been taken off of the spring before it hit his face. It could have been so much worse. Reply
@Evil Edna: His point is that a composite helmet just works better high-impact stuff.
Not to mention that spring would have embedded itself into the helmet, thereby deforming the metal of an aluminum helmet and leaving it deformed into Massa's head.
He said you are right, and provides an example why. Reply
Not to mention that spring would have embedded itself into the helmet, thereby deforming the metal of an aluminum helmet and leaving it deformed into Massa's head.
He said you are right, and provides an example why. Reply
@Evil Edna: I still don't buy that an aluminum helmet would be that bad, since aluminum HAS some flexibility inherently. I have dents in my helmet, as do most others, and you know what? I felt those the least out of all hits I've taken. Aluminum bends and flexes, but also has a high protection rate. It would be up to testing, but it can't be the worst way to go.
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