This is a spinn off from annother thread where this photomontage of Chemmy Alcott was posted.
In the thread was pointed out that she did not tip her new inside leg enough into the new turn in frame 2 and also that her inside ski in frame 3 was pivotted to a diverging angle to her outside ski. Not exactly these words but something like that. So lets try to discuss these issues a bit and see what we can come up with.
IMO, her inside ski tipping in frame 2 is perfectly normal. She might not match her shins perfectly but thats because her stance is fearly wide and she is some what extended. If she narrowed down her stance and bent more at the knees she would have been able to tip her new inside leg more aggressively. But she did tip her inside leg through out the whole turn. Lets take a closer look.
Since her new inside ski was up in the air at transition in frame 2 the tipping movement resulted in a ski pivot in frame 3. The reason for this is simple. Our feet always try to align themselves after our femurs and shins. Pointing in the same way our knees bend. Since the tipping movement of pointing our knee into the turn is a result of femure rotation our feet will follow. However, her outside foot did not pivot even if she did drive her outside knee and leg into the turn. Why is that? Simple, its because her outside right foot twisted at the ancle in relationship to her shin and femure. A result of the ski being edge locked carving and unable to twist like her inside foot that was up in the air.
I have given this much thaught over the past few years and come up with an explanation. Asked a few coaches and instructors but they were never able to lower themselves onto my level. Here is what I found. The femure rotation tipping movements we apply to our leggs to go from one set of edges to the other when carving arc to arc are in direct relationship with how flexible our anclejoints are. Rotation at the ancle. Once I realized this it was easy to see why 10y old kids could ski with parallel shins while old men could not. Not that its entirely an age issue. Some are more flexible than others. Young or old. We have this 27y old female in our club that can point her knee twise as far inside as I can. Easily. It looks abonormal. And an older 70y old master that cant point his knee one mm. His ancle joints are totally stiff.
Here is an easy test you can do right at home.
Stand with your knees slightly bent (A) and point your left knee outwards (B). Be sure to leave your foot firmly placed on the floor. Now lift your foot up (C) and notice how it snaps left aligning itself along the rest of the leg. Its sometimes refered to as "adding torque" to the ski.
So thats what happened to Chemmys inside leg in frame 3. Note that she most likely did it on purpose as she wanted the inside ski to track at a tighter turn radius or simply just get out of the way.
Check out your range of twisting motion at the ancle. If you are having trouble matching parallel shins then it might be because your range of motion is limited. Im sure it can be streched if too tight.
Note that very tight ski boot shafts will prevent your shins from rotating.