Originally Posted by JESINSTR
So Rick, Let me do some interpretation and see if you agree.
If edging (and circular travel) happens as a result of the inside leg getting shorter (allowing the Com to move forward and inside) then ILE is the trigger that reverses that process and allows the Com to return to an inertial path, which just so happens to be across the direction of the skis.
As for your "state of imbalance" I see it instead as a rapid departure from centripetal balance into a short period of gravitational balance. Whereas entry into the new turn begins with progressive edging and a longer but blended transition from gravitational balance into centripetal balance.
Let me try coming at it from a different angle. There are two primary forces at play in the balance equation as we ski, and you've identified them; gravity, and centripetal/centrifugal (CC) force. Gravity is always in play, CC force is almost always in play, because it's present anytime we're turning. The only time centripetal force is non existent while making a series of turns is when we're at edge angle neutral during the transition, once turning has ceased.
At all times when both gravity and CC force are present, the two are working to drive our Center of Mass CM in different directions. This results in a resultant force which is a combination of the two, which acts to drive our CM in a singular direction. Imagine standing on ice, in the center of a clock face colored in the ice. One person named Mr. G is pushing you towards 6 o'clock, and another guy named Mr. C is pushing your towards 3 O'clock with the same amount of force as Mr. G is pushing with. You're on slippery shoes, in what direction do you think you will slide? Yep, 4:30.
That's what I mean by the resultant force of the two working together. In the above example, if you put on a pair of spikes, extend your leg towards the outside of the clock face in a direction towards 4:30, and drive your spike into the ice, neither Mr. C or Mr. G will be able to move you. You will be balanced against their combined efforts. This is what happens when you're skiing in balance.
Now imagine that instead of extending your spiked foot towards 4:30, you extend it towards 4:00 O'clock and plant your foot there. You now become out of balance. You're able to resist all of Mr. C's efforts to push you, but not all of Mr's G's efforts to move you. The result is Mr. G will be able to push you off the clock face, your planted foot will not be able to stop him. This is what happens when you lean in too much while skiing. You begin tipping towards your inside foot, on a course that if unaltered will result in a fall to the snow. This is the intentionally created imbalance state I speak of that happens during the development of edge angle.
This time, back on that clock face, imagine extending your spiked foot towards 5:00 o'clock. You're now resisting all of Mr. G's effort to move you, but not all of Mr. C's efforts. Mr. C is now able to push you off the clock face, your planted foot will not be able to stop him. This is what happens when you angulate too much while skiing, or change your base of support from your outside to your inside ski. You begin rolling back off edge, and your CM moves back over top of your outside ski. This is what ILE does, and how it acts to launch a transition. Both forces are still involved, still acting on us, we simply change the location of our base of support so that Mr C, Centrifugal/centripetal force can do the work of rolling us off edge and into the new turn. Or if you'd like to look at it this way; it allows centripetal force to turn our skis without also turning our body. That last sentence is just to sidestep the centrifugal/centripetal debate. Each of you reading, feel free to look at it in the manner that makes sense to you.