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Boot flex and turns

post #1 of 4
Thread Starter 
Note to Comprex: When we sink into the ski and thereby flex the front, we're not dorsiflexing using muscles, but from the body weight (unless you consciously lift your forefoot as you sink). So the T. anterior doesn't much come into play.

On the larger question, seems to me that while you want a boot that flexes enough forward to allow balanced sinking and extension, the real issue is lateral stiffness under torque. Our ankle roll needs to be transmitted to the ski Right Now. Problem then is to find boots that are sufficiently flexible in one axis and sufficiently stiff in the other.
post #2 of 4
Quote:
Originally Posted by beyond View Post
Note to Comprex: When we sink into the ski and thereby flex the front, we're not dorsiflexing using muscles, but from the body weight (unless you consciously lift your forefoot as you sink). So the T. anterior doesn't much come into play.
Ah, but what of the inside ski, when we wish to pull the tip back without weighting that ski?
post #3 of 4
Thread Starter 
Comprex: Inside ski, hmmm? Well, I agree that we may want to unweight the tip, but I don't think we do it by firing the T. anterior as much as we do it, again, by shifts in the CM and a more passive reduction in joint angle at the ankle and knee. But I'm not a former racer or current instructor, so can't say for sure.

I do know anatomy, though, and I know that the T. anterior supinates as it dorsiflexes, because of its point of attachment. The main effect of firing it consciously will be to mildly supinate the boot, eg, weight the outside, and thus the edge of the inside ski closest to the center of the turn radius. But it's a small muscle, and I don't see how building it up will make much of an impact, compared to the force generated by rolling the ankles. Which involves different muscles.
post #4 of 4
Quote:
Originally Posted by beyond View Post
Comprex: Inside ski, hmmm? Well, I agree that we may want to unweight the tip, but I don't think we do it by firing the T. anterior as much as we do it, again, by shifts in the CM and a more passive reduction in joint angle at the ankle and knee. But I'm not a former racer or current instructor, so can't say for sure.

I do know anatomy, though, and I know that the T. anterior supinates as it dorsiflexes, because of its point of attachment. The main effect of firing it consciously will be to mildly supinate the boot, eg, weight the outside, and thus the edge of the inside ski closest to the center of the turn radius. But it's a small muscle, and I don't see how building it up will make much of an impact, compared to the force generated by rolling the ankles. Which involves different muscles.
beyond, agreed with the above, my confusion arises when the CM is already lined up to pressure the outside ski.



Agreed that, if we pull back the white ski, that ankle needs to close?

So, to pull the white ski back we have a bit of a problem: the forward displacement of CM that flexes the black ski boot is not available to flex the white ski boot unless we attempt
a) early weight shift to the inside (which messes up the black ski edge set and all the angulation/banking we've done so far).
b) wedging the ski backwards from the hip so that the ankle is passively closed by white ski tip pressure against the snow (which may be a braking move)
c) dorsiflexion (and correction for over-supination by -reverse- ankle roll).

You see my confusion?
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