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How fast could someone spin before skis exploded

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weastcoat
Posts: 4102 - Karma: 37,989
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.
Aug 24 2021 12:27PM 33 0
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MaimHelp
Posts: 1384 - Karma: 10,284
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
Aug 24 2021 12:31PM 11 0
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Biffbarf
Posts: 4736 - Karma: 51,735
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
Aug 24 2021 1:15PM 9 0
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ericforman
Posts: 717 - Karma: 6,152
I suspect the bindings would eject or you would destroy your knees before your skis exploded.
Aug 24 2021 1:30PM 11 0
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SavageBiff
Posts: 3265 - Karma: 13,503
I’d expect your organs would fail long before the skis
Aug 24 2021 1:45PM 29 0
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Skibumsmith
Posts: 5344 - Karma: 11,020
BiffbarfYou 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


Pretty much this. It'll make sense once you get to your mechanics of materials course.
Aug 24 2021 2:01PM 3 0
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keagan.karstens
Posts: 1133 - Karma: 24,795
Build a person then put the person on em and see how fast u can spin before u explode
Aug 24 2021 3:10PM 6 1
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MoneyMakerMike
Posts: 1222 - Karma: 5,619
This sounds like a Dolan thread
Aug 24 2021 5:42PM 21 0
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SuspiciousFish
Posts: 2687 - Karma: 15,733
MoneyMakerMikeThis sounds like a Dolan thread


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.
Aug 24 2021 6:06PM 20 0
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eheath
Posts: 59122 - Karma: 97,464
weastcoastI was sitting in one of my engineering classes today going over the syllabus


You know how I know you're a freshman? You went to the syllabus day.
Aug 24 2021 6:06PM 14 5
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mrk127
Posts: 1444 - Karma: 12,782
weastcoast. But seriously I wanna some day spin a ski so fast with some sort of machine that the whole thing just gets shredded apart.

That’s what’s up
Aug 24 2021 6:07PM 1 0
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partyandBS
Posts: 1157 - Karma: 12,068
I think they would spin too far into the future and you would never be able to observe the results.
Aug 24 2021 6:48PM 6 0
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AndrewGravesSV
Posts: 2761 - Karma: 11,144
SkibumsmithPretty much this. It'll make sense once you get to your mechanics of materials course.

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
Aug 24 2021 7:00PM 1 0
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Biffbarf
Posts: 4736 - Karma: 51,735
eheathYou know how I know you're a freshman? You went to the syllabus day.


Engineering students don't get syllabus day
Aug 24 2021 7:00PM 13 0
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AndrewGravesSV
Posts: 2761 - Karma: 11,144
BiffbarfEngineering students don't get syllabus day


fr, its 20 minutes and then a full ass lesson with homework assigned
Aug 24 2021 7:04PM 7 0
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Skiblade420
Posts: 937 - Karma: 14,830
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
Aug 24 2021 7:04PM 8 0
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weastcoat
Posts: 4102 - Karma: 37,989
AndrewGravesSVfr, its 20 minutes and then a full ass lesson with homework assigned

This is kinda how it went
Aug 24 2021 7:10PM 2 0
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eheath
Posts: 59122 - Karma: 97,464
BiffbarfEngineering students don't get syllabus day


Oh please, engineers are like vegans, they just have to tell everyone how much harder their classes are than everyone else.
Aug 24 2021 7:11PM 9 17
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Biffbarf
Posts: 4736 - Karma: 51,735
eheathOh please, engineers are like vegans, they just have to tell everyone how much harder their classes are than everyone else.


I don't make the rules man. It's not my fault non-stem classes are a joke.
Aug 24 2021 7:17PM 19 0
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Line_Skis
Posts: 1955 - Karma: 34,530
I hate how much I love this question. Future spins protect you from physics.
Aug 24 2021 7:27PM 10 0
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deathvalley69
Posts: 631 - Karma: 4,180
eheathOh please, engineers are like vegans, they just have to tell everyone how much harder their classes are than everyone else.


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
Aug 24 2021 7:43PM 7 0
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weastcoat
Posts: 4102 - Karma: 37,989
eheathOh please, engineers are like vegans, they just have to tell everyone how much harder their classes are than everyone else.

Homie mad his full time job is babysitting a bunch of shitbirds on a niche forum website about skiing.
Aug 24 2021 8:53PM 18 0
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MaimHelp
Posts: 1384 - Karma: 10,284
eheathOh please, engineers are like vegans, they just have to tell everyone how much harder their classes are than everyone else.


Yeah we know you could never get anywhere near a vegan diet, or any diet for the matter
Aug 24 2021 8:55PM 15 0
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KCoCM
Posts: 944 - Karma: 8,458
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
Aug 24 2021 8:57PM 1 0
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theabortionator
Posts: 49424 - Karma: 135,903
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.
Aug 24 2021 9:08PM 0 0
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bennwithtwons
Posts: 692 - Karma: 3,255
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!
Aug 24 2021 9:13PM 1 0
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r00kie
Posts: 4006 - Karma: 42,138
Anyone have a helicopter? I have an idea.
Aug 24 2021 9:13PM 8 0
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elcheapo
Posts: 3449 - Karma: 13,881
Probably aerodynamic issues involved and they'd probably flutter first then delamimate then be a mess.
Aug 24 2021 11:40PM 1 0
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Butterytips69
Posts: 578 - Karma: 6,311
weastcoastHomie mad his full time job is babysitting a bunch of shitbirds on a niche forum website about skiing.

Just wait til you get a full time engineering job and wish you could spend your day on this site
Aug 25 2021 12:26AM 1 0
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eheath
Posts: 59122 - Karma: 97,464
weastcoastHomie mad his full time job is babysitting a bunch of shitbirds on a niche forum website about skiing.


its funny that you think im involved with NS, at all.
Aug 25 2021 12:49AM 0 11
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partyandBS
Posts: 1157 - Karma: 12,068
eheathits funny that you think im involved with NS, at all.


*has green name*
*donated to NS*
*replies to threads daily*
*resume says NewSchoolers*

More involved than me lol.
Aug 25 2021 12:55AM 18 0
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Skiblade420
Posts: 937 - Karma: 14,830
KCoCMat 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 answer is 7 bro I did the math
Aug 25 2021 1:27AM 2 0
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eheath
Posts: 59122 - Karma: 97,464
partyandBS*has green name*
*donated to NS*
*replies to threads daily*
*resume says NewSchoolers*

More involved than me lol.


what resume?
Aug 25 2021 2:20AM 6 0
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b0ss
Posts: 588 - Karma: 3,801
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.
Aug 25 2021 3:39AM 2 0
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CharlzHub
Posts: 1065 - Karma: 7,623
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
Aug 25 2021 4:13AM 1 0
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CatdickBojangles
Posts: 5780 - Karma: 56,677
partyandBS*has green name*
*donated to NS*
*replies to threads daily*
*resume says NewSchoolers*

More involved than me lol.


I can’t wait to put 2x MOTM on Newschoolers.com on my résumé. Jeff Bezos will probably hire me to run Amazon.
Aug 25 2021 8:11AM 6 0
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TRVP_ANGEL
Posts: 11823 - Karma: 102,312
CatdickBojanglesI can’t wait to put 2x MOTM on Newschoolers.com on my résumé. Jeff Bezos will probably hire me to run Amazon.


Aug 25 2021 9:40AM 23 0
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CatdickBojangles
Posts: 5780 - Karma: 56,677
TRVP_ANGEL



Aug 25 2021 9:57AM 14 0
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ski_salmon69
Posts: 1369 - Karma: 20,281
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
Aug 25 2021 10:58PM 1 0
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JAHBRADOR
Posts: 2994 - Karma: 16,616
eheathwhat resume?

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.
Aug 25 2021 11:55PM 2 0
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JAHBRADOR
Posts: 2994 - Karma: 16,616
CatdickBojanglesrésumé


Raysumay


sorry, I’m high.
Aug 25 2021 11:58PM 0 0
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