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New Slalom technique already obsolete - Page 2

post #31 of 36
What do you think about this as an uderstanding of why two arcs look paralell in all aspects but we feel that they have to be differnt somhow.

If you were to make a radious say in construction. YOu would put a nail into the floor and take a tape measure, hook it on the nail. Say your radious is 20 feet, Place your pencle on 20 and draw an arc. and if we were to make another arc say a comfotable stance away from the fist it would be a 21 foot 3 inch arc, for instance.

What if you moved the nail 1foot 3inches and drew another arc at 20 feet. what if there is sompthing in this that can explain what is happening with that pesky inside ski.

now everyone is looking at the center of a turn asuming that only one nail can be placed in the center of the turn. If you measure the center of each arc as an individual arc would you find that these arcs are acualy the same radious afterall because you have to treat the arcs as individual arcs? The reasons I would say have sompthing to do with the dynamics involved. moving across a surface.

Total guess.

"The two nail theory".
post #32 of 36
If you draw two twenty ft arcs far enough they would cross each other at two places leaving a crescent shape between them. At no place would they be parallel to each other. Unless you count the two points where a line drawn through the two center points crosses the arcs. I'd say that's splitting hairs.
In an earlier post I described tracks left by equal radius arcs as divirging then convirging, those are portions of the arcs drawn above.
I saw a USST poster yesteday where the athlete is making a "two footed turn", his shins were wider at the knees than the ankles. Closer examination revealed he was appearantly canted positively making it necessary to move the inside knee more to get the needed edge angle. Also the inside foot was back causing less "tip lead" and more square hips.

<FONT COLOR="#800080" SIZE="1">[ October 28, 2001 08:02 AM: Message edited 1 time, by SLATZ ]</font>
post #33 of 36
I just like to highlight a couple of theoretical points about parallel arcs. If you take last years Atomic WC Slalom Ski at 173cm length and carved an arc on the outside ski where the edge angle is 35 degrees your theoretical radius would be 11.5m. So with a boot spacing of say 35cm you would need an inside ski radius of 11.15m or so to have parallel arcs. To get this radius theoretically, your edge angle of the inside ski would have to be 37 degrees. The difference in spacing between the lower legs measured at the boot and the knees would be about 2cm to create this difference in edge angles. (The space is larger between the knees in order to create the larger edge angle of the inside ski). This is very little and hardly perceptible. Specifically as there in all likelyhood would be a slight lead with the inside ski so it would be very very hard to see this difference. So for all practical purposes the lower legs would be viewed as parallel.
post #34 of 36
If you cant the way Witherall says in the Athletic Skier you will have approximatly 4 degrees more inside edge with shins parallel. Your point is well taken. However few World Cup skiers are canted that way. Read The Skiers Edge for more ideas on how it's possible to make a tighter arc with the inside ski.
post #35 of 36
Actually my post was not intended to suggest canting. I merely wanted to show that there is not much difference in edge angles of the skis needed to create parallel arcs. So little in fact, that for most people it would be impossible to tell that the lower legs would not be parallel. Personally I believe it is good to be neutral and if needed to get to this point, canting should be done. Otherwise, as suggested, achieve the necessary angulation by applying techincal skills.
post #36 of 36
Yes, I found it very interesting. Most top athletes use a more neutral alignment. It certainly is more a matter of touch and feel. There is more art than technique to this sport than most of us "techno-weenies" realize. [img]smile.gif[/img]
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