Just watched chapter 4
Totally agree with skiers tend to use friction vs. gravity for their speed control! I try to ski a slow enough line yet ski around that line as fast as I can and keep my skis moving forward, rather than sideways, as much as possible.
just watched chapter 5
While their are different schools thoughts on turning phases, I agree with your general description up until the point where you begin talking about remaining tall to resist forces. If we were simply making one turn to a stop I may agree, but linking turns presents more complexity to the problem. I want to make an effort with my turns to redistribute some of that pressure higher in the turns and is where my legs are generally longer but once my mass is redirected where I want it I must begin to release my turn to permit my mass to "topple" (term du jour) over my skis toward the apex of the new turn. When the forces are manageable and I am moving slower, I can keep my outside leg long and extend off my uphill leg to go up and over my skis but, when the magnitude of forces in a higher speed or tighter arced turn create more force than is desired to turn my skis, I must begin to soften my legs through flexion in the last phase to absorb some of this energy and redirect it higher in the new turn where it will aid bending the skis into and early arc and permit my mass to crossover my feet without being catapulted out of the turns. So I would argue that perhaps the highest load on my skis if I am skiing well is during your phase 2 and moving through phase three I am releasing the force while continuing to turn my skis as my mass moves across my feet to change my edges and begin your phase 1.
You continually reference a lower position as a weaker position? In regards to resisting vertical loading as in your barbell reference, I would agree, but I relate a tall stance is skiing as quicker and a lower stance as more powerful when it relates to the rotary skill. Think of a bolt that we can not loosen with a screw driver but when we create an angle with a ratchet wrench we have much more leverage with the same length arm. Conversely once the bolt has little resistance we can turn in much quicker with a screwdriver than with a wrench place at a right angle. I believe I am more powerful to turn or twist my skis, if I wish to, in a more flexed stance and a wider stance.
You also talk about edging and pressure in the middle of the ski to turn it. I agree, but if I want to tighten the radius of my turn I will also lever more pressure on the shovels or lengthen the radius by moving aft. I want to control my arc rather than go along for the ride. Now if I were only skiing on 12m radius slalom skis all the time I co uld be much lazier and simply use pressure and edge to make shorter turns down a gentle slope but increase the pitch and speed and I will need to modulate my skill blend to shape the turns to suit.
Modern equipment has lulled average skiers into thinking they are great skier because they have discovered carving by simply using pressure and edge, in fact there are whole teaching systems out there that tout this is all you need. When in fact real expert skiers and accurately moderate the skill blends to ski just inside of a true carved turn to minimize skidding and optimize forward movement yet release the edge grip just enough to allow a shaping of the arc to suit the skier's desired path.
You talk about gait and re-supinating the foot, here you are demonstrating a huge tip lead and counter which is what it moving your pressure to the ball of your foot and causing the supination. It looks as though this movement will promote "park n ride" turns and inhibit the involvement of the inside ski to also scribe and arc in the snow.
It also sounds like you are advocating aligning the boot sole and cuff so that they line up with your navel and consequently severely under edging the ski?
Agree cuff alignment is use to accommodate tibia varum vs. to correct knee alignment. Agree in general with your simplified description however, you and I both know there are exceptions to the rules and sometimes canting is used to correct and sometimes to accommodate.
ch 10 & 11
I like pretty much what you are saying here. I break alignment up into three planes of motion as well 4 on the sagittal, 4 on the lateral, and 2 on the transverse plane. I begin, as do you, with the foot and work up and out. Starting with a footbed to place the foot in what I call a soft neutral (not locked). the foot bed is the first step on the frontal plane for me, then I move to the cuff angle to match the lower leg angle, then to the sole angle, an lastly to the base bevel. On the sagittal plane I again begin with the foot and ankle by checking dorsiflexion range and adjusting the ramp angle and forward lean accordingly, then I look at the skier clicked into their bindings and adjust the static delta angle to "ball park". I look for the skier in a neutral cuff position to have their knees plumb over their toes and the lower leg angle to match the spine angle. Then we go on snow and test delta with shims to fine tune dynamically. The last parameter on the sagittal plane is the binding mount position which determines where we stand over the ski's sweet spot. On the transverse plane I consider the boot abduction angle and cuff pivot angle but simply try to match the skier's needs in these areas with a boot choice rather than making modifications.
After watching through the whole series my general thoughts are in agreement except for your theory that we need to move into supination to pressure the ball of the foot and counter rotate excessively like Stein Erickson to ski contemporary. I believe this tact will inhibit accurate steering of out skis and relegates the skier to rely solely on pressure and edge to turn. Again it is not walking it is turning so think about a person in bare feet in the sand, running around a corner.....does the foot pronate or supinate? If you do not want to sprain your ankle, I would suggest pronating, and I believe this is valid for skiing too. I want to get my ski edge as far under my ankle and "balance axis" as possible for optimum edge hold (see ice skate).