 Poster: A snowHead
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So, following the bootfitting, SZK and I were discussing skis. Given that his shop has a lot of fatter skis, and ones with larger tips/tails, we ended up measuring some.
This started out after I checked the mounting marks on this year's Seths, and can confirm that the "Core Centre" is NOT the middle of the ski. SZK has suggested that the Core Centre mark could well be the flex centre of the ski, which will not necessarily be the middle. But that's another story...
Anyway, we measure a series of skis. Firstly measuring their actual length - by putting a tape measure straight between the tip and tail. Then we measure the running length. Definitions may vary as to what that is, but we took it by putting two skis base to base, and measuring the distance between the points where they touched. So, it is the unpressured length of the ski that would be in contact with the snow.
Divide one by the other and you have the ratio of running length to actual length.
Turns out that the K2 Seth has a value of 1.16. On a 179cm ski, only 153cm of it is the running length - 26cm is taken up by the tip/tail.
Now, if you think that's bad, then steer clear of the Nordica Hot Rod Afterburner. It isn't a particularly "twin" tipped ski, but it's ratio was 1.2. You buy a 177cm in it, and you only get 147cm!
With non-twins, the figure is down nearer 1.1.
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Obviously A snowHead isn't a real person
Obviously A snowHead isn't a real person
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Wear The Fox Hat, Very interesting. when I have time I'll have to check mine out. 
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Well, the person's real but it's just a made up name, see?
Well, the person's real but it's just a made up name, see?
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SZK has suggested that the Core Centre mark could well be the flex centre of the ski, which will not necessarily be the middle. But that's another story...
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Or even the sidecut radius (imaginary) centre on some skis, but that's another story...
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You need to Login to know who's really who.
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Anyway, snowHeads is much more fun if you do.
Anyway, snowHeads is much more fun if you do.
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Aren't you bound to get some strange figures like that with skis made for soft snow? Esp if you're looking at skis with a lot of rocker or even a reverse camber. When you're in soft snow the whole base of the ski will be in contact with the snow
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You'll need to Register first of course.
You'll need to Register first of course.
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Arno, I agree. We didn't have any pontoons, etc to try it on, but for more traditional designs, it can hold true. But it does help to explain why so many guys on twins are able to make good turns on piste - they are on very short skis!
Sage, nothing really matters, anyone can see. It was just something to think about.
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168 Volkl Allstars: They're actually only 166 long to begin with. Running length 146. Ratio 1.14
The allstars have a bit of a raised tail...
173 Salomon xfree7 (Hej i learned on them:P) 172 long, running length 156. Ratio 1.10, flat tails.
Some family member stuff:
163 Head C200, 162 long, 146 running length. Ratio 1.11. Slightly raised tail.
158 Atomic C5.2, 157 long, 137 running length. Ratio 1.15. also slightly raised tail.
Now there is some major differences in the fronts of those skis. The salomons have rather pointy tips, while the volks and head have a much more rounded, appearing shorter, tips.
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Sage, No that sounds spot, it's a piste ski.
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You'll get to see more forums and be part of the best ski club on the net.
You'll get to see more forums and be part of the best ski club on the net.
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hmmm... and if you had a ski with conventional sidecut but a lot of rocker, couldn't the running length as measured above be much shorter than the length of edge of the ski which is in contact with the snow when you're carving?
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Arno, Yes, however the part of the ski that gives it it's feeling, response remains the same.
I'm yet to fully understand the relavance of this Data.
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snowHeads are a friendly bunch.
snowHeads are a friendly bunch.
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And love to help out and answer questions and of course, read each other's snow reports.
And love to help out and answer questions and of course, read each other's snow reports.
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Sage, Yes, it has to be of relevance as the data is consistant between ski types, ie Slalom, Freestyle, Big Mountain etc. What is exactly the relevance, i'll be asking my friends at Nordica.
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You know it makes sense.
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SMALLZOOKEEPER, Let us know as soon as you do - all very interesting. 
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Otherwise you'll just go on seeing the one name:
Otherwise you'll just go on seeing the one name:
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Too short.  Why doesn't anyone make real length skis anymore?
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Poster: A snowHead
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parlor, Our style of ski seem to have the lowest ratio. I guess it's down to whether you're looking for edge presure or surface area, or at least that's what i'm finding out.
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Obviously A snowHead isn't a real person
Obviously A snowHead isn't a real person
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SMALLZOOKEEPER, should we do a doctorate in this? I mean, contact some university, and see if they'll give us qualifications for our study? 
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Well, the person's real but it's just a made up name, see?
Well, the person's real but it's just a made up name, see?
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I will measure mine this evening. No, no, no. My SKIS. Will report back tomorrow.
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You need to Login to know who's really who.
You need to Login to know who's really who.
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SMALLZOOKEEPER, i know. s'rubbish. thinking of getting some 240 ski jump skis, but they're softer than mr whippies, damn it.
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Anyway, snowHeads is much more fun if you do.
Anyway, snowHeads is much more fun if you do.
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Myself and JT noted this the other week. 174 Recons were the same overall length as 181 Outlaws 
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