Originally Posted by spindrift
FWIW, I'm reasonably convinced that at this point in time, the BoF thing is so much dated mumbo jumbo. Skis are being designed with variable sidecut. They are being designed with different tip/tail proportions. For example - that big front end on the Gotama is no accident. I'm not saying there is never any reason to deviate from the mark - just that I'm not at all convinced that resorting to "BoF" in all instances has any merit.
I think BOF is actually more important nowadays than it once was -- or at least it's important to put some analysis and thought into determining mount position, whether it's BOF or not, instead of just mounting on "the line". You do need to know something about the tip/waist/tail geometry to do this, and then factor in the desired ski use and skier tastes. This all goes way beyond accepting "the line". Sometimes it can only be done by testing various mount points on the slopes.
I am not sure I believe in the notion of a variable sidecut. As long as there is a single maximum tip dimension, a single minimum waist dimension, and a single maximum tail dimension, with a smooth continuous curve between them, the skis will have a particular radius of curvature and an associated turn center. Until sidecut shape deviates from that, it reduces to a rather simple analysis (there's actually some interesting Calculus behind this). Of course, less deep sidecuts are more versatile in that they can be made to assume a variety of turn shapes, but the edge shape still has one "design" sidecut based on the three dimensions.