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Old 27-10-08, 12:00 PM   #21
muffles
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Default Re: Dropping helmets

Also didn't one of the magazines do a test where they discovered a helment had to be dropped from at least ~3 metres to cause damage to warrant replacement? That's one tall bike
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Old 27-10-08, 12:05 PM   #22
Dangerous Dave
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Default Re: Dropping helmets

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Originally Posted by muffles View Post
Also didn't one of the magazines do a test where they discovered a helment had to be dropped from at least ~3 metres to cause damage to warrant replacement? That's one tall bike
Yeah, think it was Ride.
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Old 27-10-08, 12:09 PM   #23
AndyL
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Default Re: Dropping helmets

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Originally Posted by muffles View Post
You could work it out, you just need to figure out how fast the helmet will be travelling.

Of course that ignores the (very important) fact that nothing is generally inside the helmet when you drop it off your bike...

Who told you this?
The weight of the item does not determine its acceleration due to gravity (this is fixed at 9.81m/s2). The weight does however affect the terminal velocity, but over such a short distance I dont think the helmet would reach its terminal velocity anyway. God damn, thats the first time my physics lesson's have come in handy, lol
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Old 27-10-08, 12:11 PM   #24
Dangerous Dave
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Default Re: Dropping helmets

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Originally Posted by AndyL View Post
God damn, thats the first time my physics lesson's have come in handy, lol
Thought it was common sense?
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Old 27-10-08, 12:11 PM   #25
AndyL
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Default Re: Dropping helmets

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Originally Posted by Dangerous Dave View Post
But the helmet does not have the weight of your head in it, gravity will not replicate that at low height.

Personally I would replace the helmet, two big offs and I have never sustained any serious head injury so I appreciate the importance of a 100% helmet.
+1, a good helmet is the first and most important bit of protection for the bike rider.



Think about it, you wouldnt jump out of a plane if you werent certain that the paracute worked 100%!!
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Old 27-10-08, 12:14 PM   #26
AndyL
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Default Re: Dropping helmets

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Originally Posted by Dangerous Dave View Post
Thought it was common sense?

Only for us smart ones, lol.
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Old 27-10-08, 01:10 PM   #27
muffles
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Default Re: Dropping helmets

Quote:
Originally Posted by AndyL View Post
The weight of the item does not determine its acceleration due to gravity (this is fixed at 9.81m/s2). The weight does however affect the terminal velocity, but over such a short distance I dont think the helmet would reach its terminal velocity anyway. God damn, thats the first time my physics lesson's have come in handy, lol
Ignoring air resistance, right?

The main thing I think is the stopping though - that's where the "nothing inside" comes in

I'd definitely agree if you can't get it confirmed good (X-ray) then it's probably a better idea to get a new one...
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Old 27-10-08, 02:18 PM   #28
AndyL
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Default Re: Dropping helmets

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Ignoring air resistance, right?
Correct
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Old 27-10-08, 06:49 PM   #29
muffles
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Default Re: Dropping helmets

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Originally Posted by AndyL View Post
Correct
[Brainiac]
I can do science, me!
[/Brainiac]
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Old 27-10-08, 07:05 PM   #30
jaffacakes
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Default Re: Dropping helmets

Get it x-rayed!
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