Guess when it comes to keeping the ski in the groove it's cutting in the snow I've become a convert to the dogma of platform angle.
I don't think I expressed myself too well here so I'm going to word salad:
What I'm talking about isn't to do with the question of holding vis a vis angles in body vs angles in ski. It's about the relative leeway you have in the accuracy of your movements rotationally and fore/aft to still keep the ski tracking for different phases of the turn and different absolute edge angles.
For example: I can have platform angle but I can still rotate hard enough to prevent the tail tracking the tip. I can also prevent the tail from perfectly following the tip by manipulating where I'm standing along the length.
When you have low overall edge angle in the
first half of the arc you've got this big dilemma constantly playing out:
I want to change direction.
If I want the ski design to help me, the ski has to bend.
For the ski to bend, it has to be tipped on to an edge.
The more I want it to bend, the higher angle it has to be tipped up to.
The higher that angle is, the more I have to move inside.
To move inside without falling down on my ass, the more the force pushing back from the ski has to be.
Which means the more I have to move in, until I find some sort of equilibrium between how much I move in vs how fast I want to turn vs how much I can move in without falling down given my weight, speed, the ski's sidecut radius.
The types of movements that promote obtaining platform angle help create this outcome because they create angulation, which enables you to tip the ski to a higher angle while moving your whole body inside the turn a relatively a smaller amount.
Good skiers hack this cycle in a tiny handful of ways. Primarily they either
a) Stivot: rapidly actively rotate the ski on a low angle/in the air/unweighted, then choose a moment to hook the ski up to its critical angle and step on it and carve out the remainder.
or b) Juice the tip of the ski for a little extra turning force, which means you can either move in more even faster (because the ski turning faster while working on the snow generates more centripetal force) or choose to move in less to obtain the same turning outcome.
Punters hack this cycle...in the exact same ways, less glamorously. (They also stem, which you can consider to be just stivoting your skis one at a time).
They stivot, often by rotating their whole bodies to create a really big turning effect to get the skis to turn faster. That big turning force they get out of the ski also helps to offset the fact they may have created a lot of inclination. But that little bit of carving, if it exists, might only occur across the hill. Super common in intermediates.
A larger than expected number are too far forward, but that's often partly a result of what's already happened with regard to rotating with the whole body. This often keeps the skis rotating late in the turn.
One thing among many that seperates the way the elite skier vs punters do this is how much overall edge angle there is.
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So what happens if you tip your ski to a high edge angle and try to then rotate it aggressively in the turn?
Often, very little. For one, the higher the angle the ski is tipped up to, the more rotating the ski in to the turn is really just torquing the tip more in to the snow surface. For another, if you're laid over trying to roll the ski up, you're in a biomechanically disadvantaged position to actually be able to rotate your femur.
And, why would you want to? The ski is turning at a reasonable rate in this position, probably.
If your edge angle is low, on the other hand, your ski is working against less friction, your rotational effort is translated in to more ski turning (instead of tip pressing), and you're more biomechanically advantaged in being able to rotate your femur to do this.
And, you're more likely to want or need to, because your ski is creating minimal turning effects.
So even though it might seem to a lot of mindsets a slightly perverse way of looking at it, in my view it's actually in some ways easier to do a technically less sound turn if you're not willing to create more edge angle.