Originally Posted by jthski
It looks to me that Tomas is not riding his edges in that demo, he is rotating his femur in the socket. It looks like steady turning of the legs. He is not pivoting then stopping to ride the edge as that would not be a well executed javlin.
The mechanism of the turn is rotating the femur in the socket at a steady rate throughout the arc
I did not mean that he is riding his edges, I meant that he starts the turn with an already pivoted ski. Also he performs the drill very well and my original point was just that either way, carved or non-carved, it can be very difficult if you perform the drills towards the high-end side of the spectrum.
Regarding the mechanism I agree with TDK that the femur rotation only plays one part here.
When you have an engaged ski it has only a minor and time-limited effect to twist the femur in the socket, and when you do this I prefer to call it counter, or counter acting. In particular if you are riding on one ski twisting the femur is the same as countering with the upper body around the joint.
The two major components in how to get the ski to turn is IMO by manipulating edge angle and fore-aft. Increasing edge angle will eventually decrease the "skidding angle" and that has to be compensated with fore-aft and possibly some counter acting. You can do this and be completely square, but the performance will improve if you add proper counter/femur rotation.