|Max and BTS are saying...
I like that you referred to yourself in the 3rd person :-D
I did not mean to gripe that people use rotary. In my freeskiing, I probably throw in a LOT more short, abrupt, rotation-filled short turns. It's probably a side effect of steep terrain, big skis, and a lack of concern/care for whether or not I'm using an up movement while skiing for fun. I have nothing against skidding... the flip side of that is that I have a rigid definition of carving. This argument is largely one of semantics, as therusty pointed out very well. The disagreement re:carving/skidding/rotary, as I hoped to point out and failed, comes at one of two points:
1) the skis are traveling sideways (ie not along their length).
2) The mechanics by which the skis are caused to skid.
BTS: I believe your disagreement with my characterization is that I argued that rotation of the ski on the snow is a necessary and sufficient condition for skidding. Your response was to mention that a purely sideslipping ski is not rotation. Touche. That said, I would argue that any time that the skier is turning AND the skis are skidding, that there is rotation of the skis. I suppose that defends on my definition of rotation. Here's the best I can come up with (apologies for the mathyness): Look at the skis on the snow as a line on a plane. ok. What I'm interested in is the angle at which the line intersects the x-axis of the plane. now, as the ski travels around a carved arc, that angle has a certain trajectory. I define rotation of a ski to be the difference of that ski's angle's trajectory and the trajectory of a pure carved turn of that time/radius. Note that a pure sideslip does not qualify as rotation by this defnition since there's no turn 'radius'; my definition requires a turn radius so a turn can be compared to its pure carved/arced variant. I have a very clear picture in my head, and I think/hope that definition is at least a little clear. If it's completely opaque, let me know and I'll see what I can come up with to clarify.
That's my definition of rotation. Now the question, as I see it, revolves around whether it's possibly to skid skis without rotating the hip (in a situation besides the trivial sideslip). therusty and BTS seem to disagree on this point directly. I don't know enough biomechanics to think this one through, but if we can agree on certain definitions, perhaps some productive conversation can result. However, if everyone believes that 'carving', 'skidding', 'pivot', and 'rotation' are different things measured in different places on the body/skis, people will (continue!) to talk over each other inadvertantly.
Max, btw, nice turns. It takes some serious hootspa (sp?) to post turns that clearly come from HH's coaching on epicski these days. Thanks for provoking yet another conversation, which will hopefully result in more productive conversation.
oh, and btw, "there's nothing hard about jumping and turning your skis" might be a slight mischaracterization in lots and lots of situations. I've been in plenty of places where just jumping and turning my skis was hard technically, and DEFINITELY hard to sack up to
hopefully this makes sense and is productive...