Originally Posted by Ghost
I believe the whole body has to work together. Almost all force is on the outside edge (on hard snow), but the inside ski has to be carving a clean line, and the inside half of the body has to be pulling it's weight. Even your right foot adds to the power of a left hook.
I don't think our perspectives on this a that far apart, Ghost.
Yes, the inside leg must be active during a turn and transition, but all that activity is designed to keep the inside ski and leg from conflicting with the turning of the outside ski. As you suggest, and I trumpet, the outside is the turning ski. It alone determines the shape of the turn, by means of how it's pressured and how much it's tipped. The inside ski/leg simply need to be managed such that they do not impede that turn shape intention. Here are a few of the primary forms of that management activity:
1) Flex the inside leg so that it does not block the desired tipping of the body.
2) Redirect the inside ski at the start of the turn so the turn can be entered with diverging skis, to allow the inside ski to carve during the turn.
3) Use functional tension of the inside leg to auto steer the inside ski during the course of the turn.
Number 2 and 3 may confuse some of you. That's because there's a misconception out there that by means of tipping alone the inside ski can be carved in harmony with the outside ski throughout the turn. That's seldom the real world case, especially in larger edge angle turns. To carve in harmony, arc to arc, the inside ski must follow a smaller radius curve than the outside ski, which requires the inside ski to assume a higher edge angle. Assuming such a state requires body contortions that are unnatural and forced. At larger edge angles such contortions are near impossible, and you will rarely see it done by World Cup racers.
The reality is WC racers generally display a position in which the inside ski is riding a lower edge angle than the outside ski, so management activities number 2 and 3 come into play. Here's a photo of the inside/outside edge angle relationship I've described, with numbers 2 and 3 being done to compensate. This is the norm of what you will see on the WC, with sometimes both 2 and 3 being used, sometimes just 3.