加了魔咒的雪，你滑过吗？

snow

上周六的雪好极了，到处是白粉。可是到了周日，那些洁白的雪仿佛被加了魔咒，这个粘！ 滑不动，开始每个人都怀疑自己的雪板有问题，我心里只想着下山去换我的另一块板子，稍微平一点的道，在平时也都可以滑行，可那一天，竟然要一步一步的挪，这一天-20摄氏，比这冷和热的天，都没有这种情况，它和春雪也不一样，谁遇到这种状况？ 周日滑得很郁闷，感觉都不会滑雪了。在我看来， 这天的雪就是加了魔咒的雪。

bullpower

沙发！！！！！

bullpower

好像SNOWSPRING说过，很冷的天，反而不容易滑，原因是啥？

lulu

换低温雪腊

snowspring

回复 bullpower 的帖子

The glideing of skis on snow depends very much of the surface chemistry between the skis and the snow layer which is modulated by temperature, impurities in the snow, wax action etc.  at the molecular level.    The simple answer is that skis can slide on the snow when the pressure exerted on the snow makes a thin film of water between the skis and the snow.  But in order not to have the water/snow stck to the bottom of the skis you need the right kind of wax to faciliate the gliding.  The wax acts as an insulator between the ski and the snow/water so that you can glide on it.   

When it gets really cold, a different wax needs to be used because it has a different molecular structure to insulate the skis from the snow/water surface.   Sometimes I think too when it gets too cold, the pressure itself may not be sufficient to generate the film of water needed for the glide ( think of Boyles law in physics).   In any event, it requires the right kind of wax with the right kind of molecular structure to faciliate the glide.  That is why it is very important to pick the right kind of wax for the racers - they can loose a race because of the wrong wax used - which normally varies with the temperature and the kind of surface the skiers are gliding on.

When we go to the shop for tuneup they apply a layer of wax suitable generlly for where you are going skiing and for that kind of temperature.  However, much of the wax is worn off after several times of skiing (say 7) then you need to rewax.  In cold days you may actually have to apply another type of wax.

Similarly during spring when you have wet snow, it sticks to the bottom of you skis if you stand on a place for a long time.  Same idea.  Without the proper wax, the snow (with water) will stick and the right wax (like red wax or the very soft wax) will help your skiis to glide.   Green is I think for medium cold and blue wax is for really colld, I think.  But i may have mixed up blue and green.  In any event going for a hot wax job at skis shop is  a good idea from time to time.

I am not a wax expert but I am sharing with you what i have learned from others.  

阿慢

滑过这种雪，和温度没关系，打蜡也作用不大，应该跟雪花的结构有关。
有时雪场刚刚人造的雪在还没有推开之前就是涩涩的样子

snow

阿慢 发表于 2011-1-31 21:20
滑过这种雪，和温度没关系，打蜡也作用不大，应该跟雪花的结构有关。
有时雪场刚刚人造的雪在还没有推开之 ...

比较同意！ 因为我的板子是full tuning up后第一次用，他们知道我在路易斯湖滑雪，应该用适合的蜡。那天才－20，－30 也滑过没有这种奇怪的感觉，那感觉糟透了，严重影响了我滑雪的激情。

paul_zhou

哈哈，看来你还缺乏在各种雪上滑行的经验

Phoenixtear

雪日：”轻轻的你从我脸上滑过，还没来得及和你打招呼呢，也太不够意思了，只好让你慢点走了。“

Jeffzhang

不知道是不是雪或者冰粘在板子上了？

圣诞节在killington有一次从缆车上下来的时候，忽然板子在雪地上粘住不走，还率了一跤。脱下板子察看，发现板子上有一层冰粒。后来想明白是在缆车上经过一造雪机时，喷出的冰粒粘在了雪板上。不知道在低温下，试不是也会有这种情况发生？