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You can use physics to figure out the velocity at the time of impact... I think I remember hearing something about 25+ mph as being the number where you might want to replace it. don't quote me on it though.

first, calculate the time:

d = 0.5*g*t^2 where

d = vertical distance fallen in meters

g = 9.8 m/s^2

solve for t

or just do the square root of the quantity (d/4.9)

Then, calculate the velocity:

v = g*t

That'll give you m/s. If you want to convert to mph, multiply your velocity in m/s by 2.24.

OK, it's Sunday. That's enough. My head hurts.

first, calculate the time:

d = 0.5*g*t^2 where

d = vertical distance fallen in meters

g = 9.8 m/s^2

solve for t

or just do the square root of the quantity (d/4.9)

Then, calculate the velocity:

v = g*t

That'll give you m/s. If you want to convert to mph, multiply your velocity in m/s by 2.24.

OK, it's Sunday. That's enough. My head hurts.

3 ft = 0.91440 m

sqr rt of (d/4.9)

= sqr rt of (0.91440m)/4.9

= sqr rt of 0.1866122448979591836734693877551

= 0.43198639434357094537962275872751 m/s

= 0.43 m/s?

velocity of mph

= result of sqr rt of (d/4.9) x 2.24

= 0.43198639434357094537962275872751 x 2.24

= 0.96764952332959891765035497954961 mph

= 0.97 mph?

seems kinda off but guess it's correct

G

In my opinion, I believe a helmet could withstand a small drop. I don't think there are brittle materials used inside. Most of the materials are soft and and semi flexible, so they would have to be bent or really compressed to damage.

Just like anything in life, do what you feel comfortable with, but I would wear it.

mitt

Joined

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3,931 Posts

Dropping a helmet three feet does not affect the impact absorbing foam liner at all, so you know that part is good. You would have to drop one quite a bit harder to affect the outer shell. Then you would have to crash such that the first impact hit the exact same spot for it to make any difference anyway.

I vote to continue using the helmet, but be more careful next time. A helmet that has been placed on the ground can't "fall off".

After the shell the reason helmets are "one time use" items is that the impact absorbing foam inside compresses... and it doesn't come back. But because your head wasn't inside the helmet, the foam is just fine. That's not a problem in this case.

G

We have a helmet saying around here $5 head $5 helmet. Some of us would put a pot on our wives heads. Can you feel the love?

G

G

How would one go about getting a helmet X-rayed? And what's the cost?

G

Heck, I say that helmet is junk!!!!I will give you 20dollars for it shipped to my door.....Ha!Ha!

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