Originally Posted by jc-ski
How about some MA on this?
Hey, sorry JC. I threw this out there for the others to comment on first, but instead we got sidetracked on the centrifugal force thing. I'll have a go at it for you.
Between 8 - 13 seconds he comes around the turn at a massively high edge angle, using his outstretched inside hand as a rudder. That effectively widens his lateral base of support to over 6 feet. The hand becomes part of what is providing balance, which is why he can ski so inclined and not fall onto his side.
Around 13 seconds he begins to tip his torso back upright, aided by a bit of push with his outstretched left hand he's pulling back towards his body. At the same time (13 sec) he tips his old outside (right) knee down a bit closer to the snow, which increased his edge angle just a tad.
The cumulative effect of the torso tip, the hand push, counter steering from the knee drop, and the changing forces in Bob Barnes "do nothing" concept, causes him to become laterally out of balance, which causes his body to begin toppling across his skis and into the new turn.
Simultaneously with the toppling, he relaxes his old outside leg to get it out of the way, and extends the old inside leg, so he can get it pressured and engaged as quickly as possible for the new turn. You can see, just before he's gotten back to edge angle neutral during the roll of edge process, he's already completely on his old inside ski, with the old outside (downhill) ski up off the snow. He'll now roll onto his downhill edge, with that old inside ski in total charge of the initiation of the new turn.
A lot going on in this one, hard to label it as one particular type of transition. How much of it do you think was thought out, step by step, as I've described it here? Not much at all, I'd say. It's the body genius of an amazing athlete who's doing on the fly what's he's done countless times before. We mere mortals have to put a bit more thought into it, learning by isolating and focusing on one thing at a time, before they can even start to gel like this into a cohesive meld of a montage of movement.