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Water mellon with and without helmet drops "test"

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Sarda
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Re: Helmet...no splat. No helmet...splat.

Postby Sarda » Tue Jun 22, 2021 1:06 pm

Is this what you are looking for?
Is the topic title misleading?
Is it at a suitable level to your understanding?
phoenix-helmet-graphic.png

cor
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Re: Helmet...no splat. No helmet...splat.

Postby cor » Tue Jun 22, 2021 1:56 pm

I am more interested in that lasagne recipe from iriejohn´s wife.
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jumptheshark
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Re: Helmet...no splat. No helmet...splat.

Postby jumptheshark » Tue Jun 22, 2021 1:58 pm

Sarda your such a troll!

This guy has em custom made

https://inspiredbyryan.com/

He sells em on so I'm sure you could get one if you troll him long enough.

This one was for sale back in 2014. There have been a few since then.

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PullStrings
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Re: Helmet...no splat. No helmet...splat.

Postby PullStrings » Tue Jun 22, 2021 2:04 pm

Rocks at your spot....splat !

No rocks at your spot...no splat !

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Re: Helmet...no splat. No helmet...splat.

Postby jumptheshark » Tue Jun 22, 2021 2:39 pm

You can see the CE cert tag in that instagram shot.

Currently out of stock

https://skifly.com/shop?olsPage=t%2Frya ... met&page=2

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Re: Helmet...no splat. No helmet...splat.

Postby Matteo V » Tue Jun 22, 2021 3:08 pm

PullStrings wrote:
Tue Jun 22, 2021 2:04 pm
Rocks at your spot....splat !

No rocks at your spot...no splat !
Rocks on the beach, logs in the surf, logs on the beach, mid/low tide sand hard enough to ride a narrow tired bicycle on, vehicles on the beach........

It's not usually the stuff you think of that squishes your brains out, it's the stuff that you dont think of.

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Re: Helmet...no splat. No helmet...splat.

Postby FredBGG » Tue Jun 22, 2021 3:30 pm

andylc wrote:
Tue Jun 22, 2021 8:36 am
I think most functioning humans could work out that dropping a helmet, or indeed anything made of strong plastic, onto a rock from 8ft versus a watermelon is going to yield these results…

It's not about the helmet not braking, it is about the water mellon not breaking in the helmet.

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Re: Helmet...no splat. No helmet...splat.

Postby FredBGG » Tue Jun 22, 2021 3:40 pm

PullStrings wrote:
Tue Jun 22, 2021 2:04 pm
Rocks at your spot....splat !

No rocks at your spot...no splat !
I work in the motion picture industry and we have to do specific training to work on sets
because of all the lifting equipment and working high from the ground.

Experienced crew members will tell you never to consider sand as safer than other ground surfaces.
I can't remember the exact numbers, but it was about this:
5ft drop onto cement is about the same as a 10ft drop onto sand. It's sort of like the planing effect on water.

We displace water if we move slow enough, but we plane on water if we move a bit faster.

Sand just under the surface if far more compact, compressed by the sand on top.

Wet sand is very hard.

Also on sand beaches you can't hit yourself on the head with the rail of your board any harder than you can on a rocky beach :thumb:

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Re: Helmet...no splat. No helmet...splat.

Postby nothing2seehere » Tue Jun 22, 2021 3:45 pm

vannibombonato wrote:
Tue Jun 22, 2021 12:38 pm
nothing2seehere wrote:
Tue Jun 22, 2021 8:56 am
What happens if its higher than 8 ft though? 8ft drop is only a 2ft lofting for a 6ft person. Does the water melon still survive from 15ft? Thats a proper lofting. What about higher speed. Gravity is fine but kitesurfers are measuring 100kph speeds from a kiteloop these days. What if you fire the water melon at a rock at 100kph. Does it still stay intact in the helmet.
The point is that an helmet will save you from impacts that would have killed you without an helmet.

And just like any existing safety device on earth, it won’t save you from all of them.
Sure. But you have to balance it up against accidents that would kill you if you are wearing a helmet. You need the data to be able to do that :D

I had an acquaintance killed by his motorcyle helmet. Low sided on diesel spill on a corner. Slid at slow speed under a van. Helmet was too thick to go under, got wedged and broke his neck. Ultimately motorcycle helmets are designed to protect against abrasion not impact anyway but its a totally different medium anyway (high speed - hard surface).

I'm more interested in understanding what people see as dangers so I can mitigate against them to a degree I feel comfortable with personally.

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Re: Helmet...no splat. No helmet...splat.

Postby FredBGG » Tue Jun 22, 2021 3:52 pm

Kamikuza wrote:
Tue Jun 22, 2021 11:22 am
Do the same experiment into water with a G-meter, at increasing speeds?
High speed water-skiers that race at over 100mph all wear helmets.
They are reduce deceleration when hitting water, especially helmets with holes or mesh on the surface.

A helmet has less drag in water that a head with hair or even shaven.

Here a water-ski racer falls at 143mph he flips and bounces several times. The helmet reduces the decelerations on each impact and he is in good enough shape to do a second run.


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