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Dorikka comments on Wear a Helmet While Driving a Car - Less Wrong Discussion
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Was looking at this in the past, a couple of thoughts. 1. Some articles seem to indicate that repetitive impacts as small as 10g may have cumulative effect. By increasing the effective diameter of the skull, helmets may increase thr likelihood of impact by reducing the necessary angular displacement for the head ro collide with back of seat. As materials of many helmets are tuned for more severe impacts, they may not offer meaningful protection in this domain. 2. Do helmets reduce peripheral vision?
The Crasche hat does not reduce peripheral vision. You can't see it (without a mirror) when it's on your head. The hat is very thin, and the protective material has rubber on the side facing your head and something very strong on the other. You raise valid objections to wearing normal helmets while driving.
So does it actually protect against the shock of impact or only against penetrating wounds?
Looks like it would mitigate the shock somewhat.
Agreed. It's designed for kids who play sports but are too cool to wear helmets.
Good point. I would be interested in learning what types of impacts (in terms of acceleration, preferably rotational) crasche is designed for, as well as its performance compared to traditional helmets. Do you know of any commonly used metrics that might ve useful for comparing helmets in general? If I remember correctly, the ASME standards use a very high acceptance criteria for linear acceleration (>100g) and do not account for rotational acceleration (which seems to cause most of the damage.)
This helmet is some neoprene (not rigid foam) inside pieces of a plastic shell. It doesn't look capable of passing certifications and the website does not mention any (or, actually, any data on how well it deals with impacts).
I got some info, linking in case you're interested.
Hmph. I sent them an email asking for some quantification of performance, or studies if they have them. Will see what they say.
Sorry, but I don't have the data you request.
I got some info regarding this, linking in case you're interested.