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Ski flex comparison graphs

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*steph*
Posts: 729 - Karma: 45
i found these over on the TGR forums and don't think they've been posted here before (didn't show up when i searched) ... thought it was pretty cool and that you guys might find it interesting

PARK SKIS (split into 2 graphs for readability)

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FAT SKIS
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Jan 7 2007 9:52AM
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west
Posts: 5229 - Karma: 36
Thats good to know and have. Thanks.
Jan 7 2007 10:00AM
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snoopy
Posts: 5240 - Karma: 30
thats interesting, good thread.
Jan 7 2007 10:11AM
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*steph*
Posts: 729 - Karma: 45
here are the translations

y-axis: "stivhet" = rigidity. so as you move up the y-axis, you move from flexier to stiffer.

x-axis:  "bakski", well "bak" = behind. so i assume "bakski" = tail.
             "midtpunkt" = middle of ski
             "framski", well "fram" = forward. so i assume "framski" = tip
             so basically the x-axis spans the ski from tail to tip.

finally, "gjennomsnitt jibbeski" (the dotted line) is probably the average within the category or best-fit curve.
Jan 7 2007 10:19AM
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fouldsys
Posts: 7404 - Karma: 39
wow thats very helpful. good find.
Jan 7 2007 10:21AM
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*steph*
Posts: 729 - Karma: 45
^ feel free to correct me if my interpretation is wrong
Jan 7 2007 10:21AM
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*steph*
Posts: 729 - Karma: 45
sigh..... you need to look at the entire length of the ski not just the midpoint - flex varies from one part of the ski to another. notice the tails of the thalls are way softer than the PE and the tails of the fujative are also substantially softer than those of the karma. the tips of the fuji's and t-halls are also softer than the tails of the pe and karma.
Jan 7 2007 11:01AM
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*steph*
Posts: 729 - Karma: 45
in any case, supposedly the test was done in a lab by weighting the ski every 10cm and measuring the flex from neutral. so i guess the curves were then calculated from the incremental plotted points.
Jan 7 2007 11:04AM
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*steph*
Posts: 729 - Karma: 45
uh, look up


(the post right above yours)
Jan 7 2007 11:09AM
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*steph*
Posts: 729 - Karma: 45
ah okay, no problem. there aren't really graphs specifically for midfat twins. there is one for what they call  "everyday skis"(stuff like rossi b-squad and dynastar legend pro rider, but the 4frnt EHP is in there)

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and a small "girl skis" category

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i also found some better information on how the test was conducted and the data collected...
(from the posts of a guy named endre on the skibuilders forum - i think ran the tests)

"The y axis is stiffness, calculated from deflection of a 10cm span of the ski.
The results from the deflection test are in mm, then I divide the force I use (25kg/249N) with the deflection of the ski (mm). this number gives an indication of the stiffness of the ski. The stiffness varies between 10-1000 N/mm, depending on where you measure. The middle of the skis vary between 300-1000 N/mm, but in the diagram i put out here the softest mid-part is around 450N (Goode) Of cource the middle of the ski is not the most important part.

You can see three marks on the y-axis. the one at the bottom is 0N/mm, the one at the middle is 500N/mm, the one at the top is 1000N/mm


Here I got a scetch of the principle of the flextester, it can be done really easy with cheap tools, you don't have to make a machine like mine (would be cool if you did though, that would make us able to communicate flex geometry)"

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Jan 7 2007 11:24AM
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*steph*
Posts: 729 - Karma: 45
hmm i don't know why the images of the other two charts above didn't work, but here's the links

"everyday skis"
http://static.flickr.com/113/305818496_a6be5a75e8.jpg?v=0

"girl skis"
http://static.flickr.com/110/305818490_9974574ee1.jpg?v=0
Jan 7 2007 11:28AM
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RoLLLinDeep
Posts: 3318 - Karma: 9
that MIT education is paying off :-D smatry
Jan 7 2007 11:40AM
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fouldsys
Posts: 7404 - Karma: 39
Click for larger image
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Jan 7 2007 11:41AM
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fouldsys
Posts: 7404 - Karma: 39
^^i tried
Jan 7 2007 11:42AM
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Chuckless
Posts: 336 - Karma: 13
the TNKs flex looks very bizarre... and it's interesting that my PE's are so much stiffer than most skis in the tips and tails.
Feb 4 2007 2:49PM
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XXL_Steeze
Posts: 1746 - Karma: 15
The graphs areb from the Norwegian ski mag Fri Flyt.

And to nomensteven who always must think that somethings wrong; They made the graphs by flexing the skis in a sort of machine that flexes all the length of the ski. (a bit hard to explain)
Feb 4 2007 3:09PM
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LC.
Posts: 5952 - Karma: 2,423
Best thread on Newschoolers ever, really helpful. And this confirms what I love about the Elan M02 - stiff underfoot, flexy at the tips and even pattern, more people should definitely try them. I just mounted my Silencers as my new rail ski (ex-rental for $80 with bindings, fuck yeah!) and from the look of the graph it's similar but softer, awesome.
Feb 4 2007 5:51PM
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GNARcoleptic
Posts: 105 - Karma: 10
just posting so i can track it for some future refrence. super sick though thanks
Feb 5 2007 8:47PM
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stinkypoodangle
Posts: 1322 - Karma: 33
looks super cool and stuff but it says that the karma is softer than the stl except for the very tip and tail... i have the stl's and they are noodles all the way through and my buddy has karmas and have only flexed em once but they seem super stiff all the way through.
Feb 5 2007 8:58PM
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Bigwoods
Posts: 3116 - Karma: 76
awsome thread
Feb 5 2007 8:59PM
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Literature
Posts: 13673 - Karma: 3,085
While I like the tech, those are busy as hell.
Feb 5 2007 9:02PM
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WeK
Posts: 1894 - Karma: 11
According to the graph, I'm assuming TMs have quite stiff back end, soft mid->up => good pop, would this be correct?
Feb 5 2007 9:13PM
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Ryanvdonk
Posts: 12811 - Karma: 1,971
nope, soft in the very tips and tails, but stiffer underfoot, though with a larger stiff area than most of the other skis.
Feb 5 2007 10:31PM
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Ryanvdonk
Posts: 12811 - Karma: 1,971
one thing that this doesn't keep into account is the durability of a ski, and how the ski softens out after it is broken in. these ski were all tested new out of the plastic wrap. so you also have to take that into consideration.
Feb 5 2007 10:38PM
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SGLogi
Posts: 1078 - Karma: 13
tight
May 4 2007 12:50PM
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