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The mechanics and/or physics of a waxless BC ski?

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  • The mechanics and/or physics of a waxless BC ski?

    I just put up a post about choosing a rugged XC ski. I was leaning towards a wider ski because I figured that it would keep my 240 lbs floating better through the snow, or at least better than my 55 mm wide Red Birds would. How much difference does a wide ski make for floating in the snow? Or do you aim more for a longer ski for a heavier person. Is there some basic formula one would use, so that you have so many grams body weight per square centimeter of ski?

    Next up - the skis I'm contemplating usually have a range of 165 to 195 cm length. How much effect does increasing the length of the ski have on the turning radius? Is it significant? Should I be choosing a ski with the most sidecut possible?

  • #2
    Get the Annum or Epoch at about 68 waist. Seems this years MGV versions are wider? Get plastic 3-pin boots. If you want to go deeper/steeper into the woods, get skins. Longer floats perceptibly more to me.


    • #3
      I like wooley12's recommendations. Good float and not-bad stride and glide speed. Also, I agree about the skins.

      Longer usually goes with "straighter". That is, the waist of the ski has to be wide enough to mount a binding and support the weight of any user. Getting a diminished radius out of that ain't likely.

      That being said, I have some 210 marathon skis that turn better than my 210 10K skis. The sprinters have .75mm of sidecut; the all day skis have 1.25mm of sidecut. The radius on either pair is probably longer than found on cup DH skis.
      Go for adventure, take pix, but make certain to bring'em back alive!


      • #4
        yes, get a wide ski. longer ski will be harder to turn. too much sidecut can create issues, making the skis squirrelly or forcing only short radius turns. go with the rossy bc-125. a softer ski is easier to turn than a stiff ski...get a wide, not too long, soft ski


        • #5
          speed= float
          bottom surface area= float
          short and fat usually is a good mix with easy turning without excessive speed. j
          hey baab, didn't see you post but you are pretty right...