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Serrated edge skis...........?

post #1 of 11
Thread Starter 
I saw this on SR and ended up on this:


http://www.wipo.int/pctdb/en/wo.jsp?wo=1999065577


Ever heard of it ?

Someone wants to pullout the chainsaw file and make a pair of these at home ?

About the WC skiers using these:


....Do the skis have the serrated edges all along the lenght of the ski, or just the center part ??? I guess this particular device is for icy slaloms only....





Dad
post #2 of 11
post #3 of 11
If you followed the link, you'll see that these are very different than the magnetraction edges from lib tech. Here's a pic that was on that website:



I've never seen anything like them before.
post #4 of 11
Probably, like serrated knife edges, impossible to resharpen.
post #5 of 11
I've played with 'serrating' my edges a variety of ways in the past. It was a real pain to do and I didn't make the effort to do it particularly well.

After regular sharpening I used a few *very* firm strokes of course sand paper run downward against the side bevel using a block of wood. This took little nicks out of the edge and left gouges along the side of the metal. I also tried using a triangular file to increase the depth a little but wanted it reversible so didn't go very deep.

I did the first 6 inches at the tip and tried that, then did longer stretches from the tip to (eventually) all the way past the sweet-spot and even back past the section under the boot.

If done only at the tip the ski seemed to work best overall in many conditions with the tip being perhaps overly responsive to gripping and provided for sharper turn entries on very firm and icy slopes. Doing it past the mid section really helped on ice in that it seemed to dig in and hold much better though it also slowed me down (perceptibly) from what I'd have otherwise expected, making steep ice a lot easier to ski slower on. Not exactly what you'd want for racing...

Serration made no worthwhile difference on soft snow and it probably just slowed me down a tiny bit more (unnoticeable).

I think the reason that serration never took off (in this form) is that it doesn't provide anything really useful that can't be had by other, less destructive means. It would be very hard to keep up (special equipment required) and would easily be damaged by a rock (instead of a rock putting in a new 'serration', sliding along a rock would wreck or wipe out existing serrations!).

In the end, it made for an interesting experiment but took a lot of work to put in and far more edge-work to repair the edges afterward.


The other form of "serration" (not really) is currently being produced on both skis and boards in the form of a 'wavy edge' pattern where the edge is mounted in a series of undulations out from the side of the board (see the link posted by Wibby above). I've a friend who's been on the snowboard version and really likes it - especially in icy conditions. And this version of 'serration' is easily maintainable.

.ma
post #6 of 11
Quote:
Originally Posted by Kneale Brownson View Post
Probably, like serrated knife edges, impossible to resharpen.
Maybe.

Otoh, once the serration is established by machine it might just be a fair bit easier to refresh by hand.

Much like sharpening a chainsaw blade: fit the file to the notch and have at it.
post #7 of 11
From the Ski Racing website:

In a report seen on the Denver Post website, Lindsey Vonn explained she switched to a serrated edge ski ("it's like a steak knife, as opposed to a butter knife," she says) for the second run of slalom at Maribor. She survived the first run in 18th, but moved to fourth in the second run, the next to fastest run of the day.

She also made a point to say how dangerously sharp the new edges are.
post #8 of 11
post #9 of 11
Quote:
Originally Posted by Kneale Brownson View Post
Probably, like serrated knife edges, impossible to resharpen.
What if they build indexing into the sidewall?
post #10 of 11
Are you talking about Magnatraction? If so, then its a fairly cool concept, which I've seen in a Gnu snowboard I bought for a young girl here in Michigan. The wavy edge is designed to give more contact when carving(sorry I'm not savy in my explanation). According to the girl on this board, its amazing.
post #11 of 11
Quote:
Originally Posted by Trekchick View Post
Are you talking about Magnatraction? If so, then its a fairly cool concept, which I've seen in a Gnu snowboard I bought for a young girl here in Michigan. The wavy edge is designed to give more contact when carving(sorry I'm not savy in my explanation). According to the girl on this board, its amazing.
No, it's much smaller serations on a straight edge.
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