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# what is pressure control ?

As tilted. What is the theory behind and how to achieve a good pressure control? Thanks in advance for contributions.

﻿carver_hk,

Quote:

As tilted. What is the theory behind and how to achieve a good pressure control? Thanks in advance for contributions.

This is a million dollar question.  Pressure control relates to the fore/aft balance, lateral balance and maintaining ski/snow contact on varying terrain.  There can be many answers to the question depending on the situation, speed, snow, and terrain.

RW

Quote:
Originally Posted by Ron White

Pressure control relates to the fore/aft balance, lateral balance and maintaining ski/snow contact on varying terrain.  There can be many answers to the question depending on the situation, speed, snow, and terrain.

RW

Oh! I was unaware of the complexity of the question. I asked because tdk6 was right on spot on my short turn MA. I feeling the need to find out what is it all about. On the very face of it I merely have to adjust my ski tip pressure so that the skis helps in turning. But second though it seems a lot more, for example the effect on counter or angulation etc. So more specifically, I like to know how pressure control is carried out through out the turn. Like what to do in each phrase?

RW is right on, there is a lot to pressure control and it varies depending on the situation, snow, etc.

To Carver’s question “I like to know how pressure control is carried out through out the turn. Like what to do in each phrase?” I’ll attempt a very general and simplistic overview via a brief mention of the three main pressure control options – Lateral (ski to ski), Fore-aft (tip to tail), and Vertical (up-down).  I’ll probably open a can of worms in my simplistic overview - a healthy discussion opportunity!

Lateral: On firm snow, ice, and groomed terrain, when turning we balance against the outside ski, so we shift most of our weight from one ski to the other – to the right ski when turning left, then to the left ski when turning right.  In other conditions, for example powder, weight is more even on both skis.

Fore-Aft:  Generally we stand in the middle of the ski, focusing our weight and balance more-or-less over the arch of the foot so that it pressures the middle of the ski.  But in reality our weight is a bit more forward at the beginning of the turn, pressuring the tips more and causing the front of the ski to bend more helping initiate the turn.  As the turn progresses our weight progressively moves rearward so it is centered on the ski around the middle of the turn and is a bit back with more pressure on the tail at the end of the turn.

Vertical: Forces generated by turning can be smoothed by extending and flexing.   Without going into great detail on this – no doubt there are threads already dedicated to the mechanics and physics – flexing and extending allows an evening out of the pressure on the skis throughout the turn.  A key (thought not the only) reason to extend in the first half of the turn is the act of extending puts more pressure on the skis when, because of turn physics, they do not have much.  Similarly, flexing in the second half absorbs (reduces) pressure on the skis when they would otherwise have a lot.  Again I’m avoiding the physics of why pressure is less at the beginning and more at the end, but Ron LeMasters book “The Skiers Edge” would be a great read for those interested.   It’s important to note I use the term “Vertical” cautiously here, and only as it relates to evening-out pressure on the skis, because proper extension-flexion movements are not just up-down but also directed forward and across the skis  -- however that’s another large topic itself.

So regarding what to do in each phase on groomed firm snow, and please note this is a gross oversimplification:

1) at the beginning of the turn transfer weight to the new outside ski  and begin to extend;

2) continue to extend until about the middle of the turn then,

3) begin to flex until the end of the turn.

Then go back to step 1 again for the next turn.  And note the movements of each step are not done all at once but smoothly and continuously.

I hesitate to put it in the above simple steps because there is so much more that is important as to how the movements are conducted, such as the directional component of the extension, but I’ll risk it in an attempt to give a bit of insight to Carver’s question.  Lessons would be highly recommended to get the correct guidance on how this is done.

Kurt

Kurt - a big thanks. This is a great account of the topic and I m sure I have learn something from your dissection. Espeically the vertical part.

I have been thinking why call it pressure control when actually it concerns 3 different dimensions and actually demand 3 different techniques to make it perfect. I glad that I opened this thread or otherwise I really have no clue its such a big topic.

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