Ski flex comparison graphs

S

*steph*

Member
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)

stiff2.jpg


stiff3.jpg


FAT SKIS

stiff1.jpg

 
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.
 
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.
 
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.
 
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)

305818496_a6be5a75e8.jpg


and a small "girl skis" category

305818490_9974574ee1.jpg


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)"

280093875_71463b227c_b.jpg

 
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.
 
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)
 
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.
 
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.
 
According to the graph, I'm assuming TMs have quite stiff back end, soft mid->up => good pop, would this be correct?
 
nope, soft in the very tips and tails, but stiffer underfoot, though with a larger stiff area than most of the other skis.
 
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.
 
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