Petkevich tells us that the salchow and loop jump are in fact "half rotation" jumps. That the take off edge deepens to such an extent on the take off that by the time the skaters presses down on the toe pick to jump the blade has completed half a turn on the ice.
Many jump specialists (including coaches at my rink) disagree with Petkevich and say that the edge should not come round as far as half a turn but that the bend to jump should be much quicker to sto pthe edge coming round as much and that any twist or turn of the blade should only ever happen on the toe pick as the skater pushed up to jump.
So which of these two scenarios would the machine be programmed to allow for? The important question of defining the jumps such that a machine can say yes or no would have to be resolved before we ever get to the stage of developing the machine.
But in order to come up with a solution for a problem, one has to wonder how it's going to be accomplished, and the possible problems with a given approach. Isn't that what's being discussed here ?
IMHO, there's no doubt that technology can help with these skating issues, all I'm saying is: it won't be easy.
Going back to the proposal section, pressure sensors can be good, but I'm not too sure if the skaters would be happy with someone putting something in their boots.
But anyway, suppose we come up a system, how it would be used? In tennis, not all plays are defined by hawk eye. The umpire makes all the calls. If a player feels that the call was wrong, on either side of the court, then he or she can challenge it. The rules say that when you call the challenge, whatever shows on the screen is the final decision. Neither the umpire nor the player can challenge it. (That's why no one complains after the challenge)
How would that play out on figure skating ? Would ever jump of every skater be automatic analyzed? Would the skaters get to challenge the tech pannel decision and then he system would come to place?
Hummm, something to think about...