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GTIR
19,076 posts
135 months
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mitzy said: GTIR said: My head weighs 6kg. Im sure it does Huni  ;);) All hail the glorious Mitzy.  I think that saying, "Dropped lid = scrap" is complete s  te now I've had a few beers and thought about it.
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Grommit
813 posts
34 months
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If dropping from 3 feet when empty is enough to render a helmet useless then it's not going to offer you much protection when you smack your head off something at high speed then is it?
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creampuff
1,220 posts
12 months
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As an engineer, infact an engineer that specialises in stress analysing things, I would say that your helmet should continue to offer the same level of protection after the drop.
The helmet provides impact protection via its EPS foam. When the foam compresses, it absorbs energy. With no head inside the helmet during a drop, there is nothing to make the foam compress. As for the shell, I find it hard to believe that there could be cracks serious enough that your helmet is going to desintergrate.
Having said that, I dropped my helmet recently and I used it as an excuse to get a new one.
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Turn7
9,337 posts
90 months
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final_edition said: I don't think Phoenix are Arai agents anymore. Really ?
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Hooli
21,186 posts
69 months
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Grommit said: If dropping from 3 feet when empty is enough to render a helmet useless then it's not going to offer you much protection when you smack your head off something at high speed then is it? Exactly my thoughts.
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mr wiki
373 posts
75 months
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Why are people buying £500 quid helmets, then sticking them in stupid places?
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jhoneyball
839 posts
145 months
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Timbuk2 said: But Ride lobbed helmets out of a first floor window onto a concrete floor then took them apart to assess the damage, and there was none in any of them. Who assessed them and how?
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Apriliaer
579 posts
27 months
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Seen the Arai bloke at Silverstone inspecting and sticking bits on crashed helmets at the Ron Haslam school.
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Apriliaer
579 posts
27 months
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creampuff said: As an engineer, infact an engineer that specialises in stress analysing things, I would say that your helmet should continue to offer the same level of protection after the drop.
The helmet provides impact protection via its EPS foam. When the foam compresses, it absorbs energy. With no head inside the helmet during a drop, there is nothing to make the foam compress. As for the shell, I find it hard to believe that there could be cracks serious enough that your helmet is going to desintergrate.
Having said that, I dropped my helmet recently and I used it as an excuse to get a new one. What about if the outer shell deflects and crushed the EPS in that area. Would that not make the EPS layer thinner and that area of the shell weaker; thus creating an area that 'absorbs' the energy less effectively?
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Timbuk2
1,018 posts
24 months
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jhoneyball said: Who assessed them and how? I don't know sorry, those were Kevin Ash's words from that link in the same post.
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creampuff
1,220 posts
12 months
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Apriliaer said: What about if the outer shell deflects and crushed the EPS in that area. Would that not make the EPS layer thinner and that area of the shell weaker; thus creating an area that 'absorbs' the energy less effectively? AFAIK there is a gap between the shell and the EPS foam. Also I don't believe the shell will deflect more than a millimetre or so when you drop it.
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Wedg1e
22,688 posts
134 months
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I've said it before on these threads and I'll keep on saying it: my mate wore an expensive brand of helmet often raved-over on here. He nutted a lamp-post at moderate pace, broke his neck and was dead a few minutes later. No helmet on the planet whether cheap, expensive, scratched, chipped or otherwise, was going to save him. So make your own choice. Spend the money if you think it's likely to make any difference. If it does you won't know, because you won't have been wearing a different helmet. If it doesn't you still won't know, because you'll be riding a cloud. Paranoia: it's a wonderful tool for marketing men
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Prof Prolapse
7,398 posts
59 months
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Wedg1e said: Paranoia: it's a wonderful tool for marketing men Helmets aside, it has amazed me the elitism in motorcycling gear. As if one brand is superior to another based only on cost, looks and anecdotes. Especially when it comes to leathers. "A thousand pound Dianese single piece is the best you say?" "Yes sir, my mate crashed and he survived so its the best and most expensive we sell. How much is your skin worth?""Presumably it's tested independently to a specific standard then?" "No"."Designated as safety clothing and CE marked as such?" "No.""Built to a specific set of safety guidelines?" "No.""It's a fashion accessory then isn't it?" "Yes.""I'll take the RST one thanks".
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toxgobbler
2,284 posts
60 months
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Best bit of marketing I ever saw was Shinji Nakano sliding across the tarmac at 200mph on his head (in an Arai) and getting up.
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moanthebairns
4,242 posts
67 months
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SO, what have we learnt? Dont take your helmet off when buying fuel! f k the petrol station staff!
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The Moose
8,999 posts
78 months
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Interesting.
Is it an ultra sound that they do to look for these internal micro cracks etc?
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The Moose
8,999 posts
78 months
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moanthebairns said: f k the petrol station staff! I doubt they'd appreciate that...although, if they're hot 
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moanthebairns
4,242 posts
67 months
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The Moose said: moanthebairns said: f k the petrol station staff! I doubt they'd appreciate that...although, if they're hot note to self, write a script for a porno movie set in a petrol station. some how work the following lines into the script... fill her up, which pump did you use? stick that on my loyalty card, ive had a bit of a spillage, can you please take your helmet off? cant you take it off for me hen! enter your chip and pin into here big boy!
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otherman
1,068 posts
34 months
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Chipchap said: 1 drop = scrap. Aha, the helmet manufacturers advice was quick out there. Many moons ago a friend and I set about trying to break a helmet he was discarding anyway. With a sledge hammer. It took loads of blows (I used to know how many but memory fails to serve up the number), so I doubt a simple drop could do significant damage.
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off_again
8,975 posts
103 months
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Following on from previous post: http://www.youtube.com/watch?v=9LfEFhBelTY&fea...Unscientific and certainly unclear as to what is actually being tested here. But it shows that some helmets are crap and most likely to break or be damaged. Other ones which comply with relevant international standards are a little more sturdy and should cope with some simple day-to-day knocks.
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