How fast could someone spin before skis exploded

weastcoat

weastcoat

Active member
I was sitting in one of my engineering classes today going over the syllabus, prof told us we would be learning about a lot of applied physics situations that are used in different types of engineering. Spinning and rotation came up, and I could only think about skiing of course. I began to ponder even further… what if someone spun so fucking fast that the centripetal force from their ski tips overcame the internal structural integrity of the ski, thus the ski would explode and break apart from the force.

Theoretically it is possible, i once spun a little glass bottle with a pressure washer so fast that it completely exploded. Imagine if andri spaghetti goes for a 3240 off a small little roller and his skis exploded. Would be pretty funny. But seriously I wanna some day spin a ski so fast with some sort of machine that the whole thing just gets shredded apart.
 
First you’d have to build a model that will have a good enough lock on the skis when spinning so the hood on the skis wouldn’t explode, then you’d have to make sure the part spinning the skis would not fail after going so fast.

If it was a skier to break the skis the binding holes would be the first to fail if the skis are not cracked or whatnot considering that the holes weaken the integrity of the wood.

interesting
 
You can get a rough calculation using ultimate strength of core materials in tension and the cross sectional area of the ski to find the force required for failure, then you can use equations with the centroid and weight of the ski to find the radial acceleration and therefor spin rpm required to break the skis.

Tldr: skis would have to spin hella fast to explode
 
14314182:Biffbarf said:
You can get a rough calculation using ultimate strength of core materials in tension and the cross sectional area of the ski to find the force required for failure, then you can use equations with the centroid and weight of the ski to find the radial acceleration and therefor spin rpm required to break the skis.

Tldr: skis would have to spin hella fast to explode
Click to expand...

Pretty much this. It'll make sense once you get to your mechanics of materials course.
 
14314265:MoneyMakerMike said:
This sounds like a Dolan thread
Click to expand...

Except it Dolan made it the whole slant would be Volkl skis could spin faster because the Nazis had the best engineers in the world and that tradition continued on into ski making.
 
topic:weastcoast said:
I was sitting in one of my engineering classes today going over the syllabus
Click to expand...

You know how I know you're a freshman? You went to the syllabus day.
 
topic:weastcoast said:
. But seriously I wanna some day spin a ski so fast with some sort of machine that the whole thing just gets shredded apart.
Click to expand...

That’s what’s up
 
14314205:Skibumsmith said:
Pretty much this. It'll make sense once you get to your mechanics of materials course.
Click to expand...

Depends on how deep you wanna take it because then you can start getting into stress fractures of the edges and how most cores are laminates so then you've gotta factor in adhesive strength. That's without even going into air resistance. You could probably write a paper and get some extra credit if you do calculations

You probably have a better chance of flipping way fast so the skis snap or simply skiing into a ditch
 
If you just calculate the x and y neutrons to the 5th power you’d get a split in the cell structure of the skis that could only be calculated after you divide it by 2 Evan heaths
 
14314282:Biffbarf said:
Engineering students don't get syllabus day
Click to expand...

Oh please, engineers are like vegans, they just have to tell everyone how much harder their classes are than everyone else.
 
14314295:eheath said:
Oh please, engineers are like vegans, they just have to tell everyone how much harder their classes are than everyone else.
Click to expand...

I don't make the rules man. It's not my fault non-stem classes are a joke.
 
14314295:eheath said:
Oh please, engineers are like vegans, they just have to tell everyone how much harder their classes are than everyone else.
Click to expand...

I’ve seriously never heard any real vegan complain about it being hard, that’s usually other people’s excuse for why they can’t be vegan
 
14314295:eheath said:
Oh please, engineers are like vegans, they just have to tell everyone how much harder their classes are than everyone else.
Click to expand...

Homie mad his full time job is babysitting a bunch of shitbirds on a niche forum website about skiing.
 
14314295:eheath said:
Oh please, engineers are like vegans, they just have to tell everyone how much harder their classes are than everyone else.
Click to expand...

Yeah we know you could never get anywhere near a vegan diet, or any diet for the matter
 
at first i was like this kids retarded but then i thought harder and had way too many thoughts about it.

1. is aerodynamic design or torsional strength more important.

2. depending on above the skis would either snap relatively cleanly if breaking from torsional strain, or the materials would slough off gradually from the side that is encountering drag, so either way ‘exploding’ seems misleading.

3. regardless of torsional strength, would the skis possibly snap prior to their calculated breaking point due to resonating at just the right frequency, the kind of thing that has been suggested in bridge collapses

4. i started my chem E classes yesterday and should be able to respond to this question much more intelligently than i’m able to at the moment ?

**This post was edited on Aug 24th 2021 at 8:59:36pm
 
The future holds alloys that are far beyond what we currently know. When one spins fast enough into the future ski technology progresses to a level many times stronger and lighter than any military technology on this planet.
 
strictly speaking, the number of rotations is irrelevant. as long as the acceleration is sufficient to exceed the strength of the ski, you could do it with minimum rotation. get started on your number crunchin and keep us posed!
 
14314338:weastcoast said:
Homie mad his full time job is babysitting a bunch of shitbirds on a niche forum website about skiing.
Click to expand...

Just wait til you get a full time engineering job and wish you could spend your day on this site
 
14314338:weastcoast said:
Homie mad his full time job is babysitting a bunch of shitbirds on a niche forum website about skiing.
Click to expand...

its funny that you think im involved with NS, at all.
 
14314425:eheath said:
its funny that you think im involved with NS, at all.
Click to expand...

*has green name*

*donated to NS*

*replies to threads daily*

*resume says NewSchoolers*

More involved than me lol.
 
14314340:KCoCM said:
at first i was like this kids retarded but then i thought harder and had way too many thoughts about it.

1. is aerodynamic design or torsional strength more important.

2. depending on above the skis would either snap relatively cleanly if breaking from torsional strain, or the materials would slough off gradually from the side that is encountering drag, so either way ‘exploding’ seems misleading.

3. regardless of torsional strength, would the skis possibly snap prior to their calculated breaking point due to resonating at just the right frequency, the kind of thing that has been suggested in bridge collapses

4. i started my chem E classes yesterday and should be able to respond to this question much more intelligently than i’m able to at the moment ?

**This post was edited on Aug 24th 2021 at 8:59:36pm
Click to expand...

The answer is 7 bro I did the math
 
Maybe if you put you entire body in a industrial ski shaping hydraulic press and made you into ski and someone did a spin while skiing you like andri or someone that spins a lot and you might get dizzy after a 1800 if you are untrained but you wouldnt explode unless you were pressed by [...] i mean all the pro dudes spin 14 in slopestyle and arent too dizzy for the next jump. You might die if an athlete knuckles tho.... dide for science.
 
The slo mo guys did this with a CD and a vinyl. You should hit them up to do it with a ski. It would have to be a fully symmetric ski though I think
 
14314427:partyandBS said:
*has green name*

*donated to NS*

*replies to threads daily*

*resume says NewSchoolers*

More involved than me lol.
Click to expand...

I can’t wait to put 2x MOTM on Newschoolers.com on my résumé. Jeff Bezos will probably hire me to run Amazon.
 
14314468:CatdickBojangles said:
I can’t wait to put 2x MOTM on Newschoolers.com on my résumé. Jeff Bezos will probably hire me to run Amazon.
Click to expand...

nhwQPbT.png
 
The maximum circumferential speed of 1000 m/s seems to be a quite general material limit. In the same way as turbines, 0.5 mm steel balls explode if they rotate more than 700,000 times a second, which corresponds to a circumferential speed of about 1000 m/s. - thesciencebreaker.org

I could spin some skis that fast for sure
 
14314437:eheath said:
what resume?
Click to expand...

Eheath the type of guy to say:

’I may not be book smart, but I’m street smart’

And actually think that it’s proving his point that he ain’t a dumbass.
 
You must log in or register to reply here.
Back
Top