Originally Posted by TomB
When the outside ankle extends and the inside leg flexes, the movement of the center of mass is diagonally foreward to the inside of the turn. When this happens the outside shin maintains contact while the inside shin increases contact pressure.
Only the PSIA can come up with such convoluted stuff. How on earth does one equate an extension (opening) of the ankle with a forward CM movement. Sorry, but this only serves to confuse even experienced skiers. I can only imagine what this would do to a beginner. Might as well tell them to go into the backseat at transition.
Interesting...I thought you were CSIA....anyway...this is such a crucial concept in skiing that it is worth further explanation....further to what I wrote above to Pierre...here is another way of thinking about it.
For an ADVANCED/EXPERT
In the transition you are doing 2 main things,these are:
1. Ending a turn
2. Starting a turn
When you end a turn you should be working the middle or even the tail of the ski....when you start a new turn you want to be working the ski tip.
So the obvious question arises...since the end of one turn is the start of the next turn...how can you be middle to back then forward all at once without a powerful ankle flex to start?
As you ski through the tranistion your feet take a longer path then your COM...this allows your COM to "catch up"...if done correctly by the time you hit "tranistion" ie flat skis at neutral...your COM should be centered over your feet (BOS)..not forward...not back...center...this is why this is called neutral...becuase it is neutral.
Tranistion..flat skis...or netrual is over in fractions of a second...you are not forward yet...your COM is still moving down the hill, as a result you are beginning to incline, and since your COM is moving inside your skis, it is still taking a shorter path meaning it is GETTING AHEAD of your feet...but not fully there yet...but we want to start engaging those ski tips ASAP...PLUS and here is the kicker...the virtual bump is causing the ground...to ineffect fall away...thus we have a need to pressure the tip while our COM is not yet forward, and the ground is moving AWAY from us...the answer...extend the ankle...pressure the ball...get the contact, and the skis engaging....by the time this happens...about a second...maybe less...the COM is fully caught up to the feet, and you can now really increase that tip pressure by driving into the front of the boots.
In the transition Beginner/Intermediates are doing the same thing as experts..ie ending a turn, and starting a new one.
But there are a few significant differences...namely the beginner/intermediates will not be working the tail of the ski..only middle...there speeds and turn radius, and slope they ski on, will means the virtual bump effects will be minimal...however it is all still there...only all of it is proportionally less....thus moves are the same, only less dramatic....