On the original question: Go with the 3 side.
A few thoughts of a more random nature:
Originally Posted by Racer256
1. Not much "gliding" in your typical Nastar venue.
I may have missed something, since I can't tell from the original post whether he's asking about Nastar, HCP (whatever that stands for), Masters, or even something entirely different, like free-skiing on firm snow or Nor-Am GS (okay, if he's racing the latter, he wouldn't be asking us
There's typically a fair amount of gliding in all of these but the first two (I guess), though it of course varies.
|2. 10-20 (male) HCPers (aka semi serious league rats) dont always have the race chops to get the angulation to utilize a 1 degree base. Let them "cheat" a bit with a more acute edge angle and easier "grab."
There seems to be a general view that those with more
skills do better with less
bevel, rather than the other way around. I will respectfully suggest (without drawing diagrams of knees and the like) that an extra 1-degree of angulation is minimal, whereas an edge hanging up at turn initiation or an inside edge catching can have a significant effect, such that you might occasionally wind up on your head.
|3. Durability? The course is 30 seconds long.
It is? What course are we talking about, again?
Anyway, I don't think durability is really an issue with the base bevel. It might
be on the side, but not a major one at 3 degrees.
|Make a wrap or two of masking tape aound the center of a file. Flat file but keep the tape centered on the ski. Old timer told me, two wraps, .5 degree. 4 wraps, 1 degree.
That's probably in the ballpark, though I'd note that if you keep the tape in the center and your ski has any significant sidecut, you'll have more base bevel at the center and less at the ends. If you wanted to vary the bevel, you'd do it the other way around. A little rough calculation tells me that in order to have a one-degree bevel in the center of a 65mm-waisted ski, your tape should be .6mm thick (four wraps? maybe); if the ski is 120mm at the tip, you'd get more like 6/10ths of a degree of bevel there.