Originally Posted by Tdk6
Very interesting...... maybe its possible to turn a GS ski at 15.5m but would not speed have anything to do with it?
I wasn't moving the ski forward at all when I bent it to that degree.
Forward Speed has no relationship to the turn radius of a ski. High Speed around a turn may provide the opportunity to pressure the ski more than otherwise, but Speed is not necessary. We can "carve" a ski at 1 mph on flat terrain merely by tipping it around 5-degrees and carefully riding the sidecut.
I think it's rather easy to bend a soft-flexing ski into a short radius carved turn with very little effort. Sure, the stiffer the ski; the more difficult it becomes to bend the ski and therefore more difficult to consistently carve that ski at that radius though it depends a bit on surface conditions.
I have wide feet and wide boots (often pressed out for my wide forefoot) so I do have problems with boot-out. Still, in softer snow I'm able to keep the ski well-bent and carving despite the sides of my boots dragging through the snow. All that matters is that the Tip and Tail stay properly engaged to keep the ski bent.
Sidecut only becomes the critical factor when on very hard surfaces like ice or near-ice. Remember that the middle of a ski will nearly always penetrate more deeply
than the tip and tail even for a straight-sided classic ski. This is because of pressure distribution along the ski.
I seem to recall a spreadsheet or calculator program somewhere that provides the turn radius if you enter the ski characteristics along with a tipping angle. Anyone remember where that is?
All this side talk about Speed, Sidecut and Turn Radius has a direct impact on Lengthening the Top of our Turns
As you correctly state above...
|The bigger the turn radius the more speed we need in order to generate the required centrifugal force.
This is important to consider at turn entry. Often, too much of the skier's momentum is downslope rather that across the slope during transition and this inhibits their ability to carve into turn entry forcing the skier to twist the skis and make a sharper turn entry.
In this respect, Forward Speed (across the slope) does become a factor in how well the top of the turn is executed.