<BLOCKQUOTE>quote:</font><HR>Originally posted by David Goldsmith:
...Because you're not moving down the slope, but are in a static position, you get none of the G-force that helps set edges and get a real feel for turning skis...<HR></BLOCKQUOTE>
Not true. You are not static, you are moving side to side, so there will still be plenty of acceleration forces acting on you, and you will still be able to practice getting your skis up on edge, etc..
The reason is that even if you are not going downhill, you are still moving side to side in something approximating sinusoidal motion, and the only possible way for this to happen is if the snow is pushing on your skis with the appropriate sideways force (which is exactly equal to your sideways acceleration). Think of yourself as a mass moving side to side on a spring.
Now, in spite of my statement above, I have to agree with your general comment that there will be differences between between skiing on a tilted turntable and real skiing, and that these will be somewhat misleading to someone aspiring to advanced skiing.
In particular, in real skiing, the center of your next turn is always downhill of you. In skiing on a turntable, the center of your next turn (and next, and next ...) is always at nearly the same "altitude" as you are on the turntable. What this means is that the various body and ski angles involved will be somewhat different between the two cases.
Another difference between skiing on one of these devices and real skiing is that for financial and safety reasons, most of the time, they probably would have to run the turntable at speeds appropriate to lower level skiers, and these speeds won't let higher level skiers feel the forces they would experience in the real world. OTOH, I'm sure they could schedule 78 RPM sessions for the really good skiers - grin.
What I would say is that skiing on one of these contraptions would certainly help a lower level skier prepare for higher level skiing, but they would still need time on a real mountain to dial in their technique.
Tom / PM