The PP Slalom Switch is strictly an on/off system that triggers at a preset load. The "predictive algorithm" system I proposed early in this thread would presumably be - as JohnN suggests - a starting point. By trial and error the system would learn how a skier is skiing in a sort of "artificial intelligence" manner, and could refine how and when it should adjust the throttle based on the skier profile as it is developing. I realize "trial and error" sounds questionable, as if the skier is some sort of guinea pig, but given that the current system can make many hundred checks and corrections per second it shouldn't be as noticeable to the skier as it sounds. The existing speed controls make all the necessary corrections anyway, it's just that they do it in a reactive fashion only. My proposal is simply to create software that is "proactive", in that it begins by following a known standard load-and-release pattern, but very early on it "edits" that pattern to more accurately reflect how the skier is actually loading and releasing. Surely we can take a cross-section of skiers and determine some sample load-and-release patterns. If nothing else, we've got great footage of Marcus Brown and Terry Winter skiing various line lengths while being tracked with a strain gauge. How hard could it be to gather a few more samples and build 3 to 5 basic profiles, which the system could refine based on data developed during the skier's actual performance? In a sense the system I'm proposing is both reactive AND proactive, in that it adds and removes throttle based on a predetermined algorithm (proactive), but it constantly adjusts that algorithm to match how the skier is affecting the boat speed (reactive). Instead of putting in a skier's weight before his set you would put in his choice of starting algorithm (have "A", "B" and "C" been spoken for yet?) and an identifier, such as "Bruce". Thereafter the boat will develop and use it's most recent "Bruce" algorithm until a new skier identity is input, or the "Bruce" identity has been cleared or reset. That way "Bruce" could ski a later set with the same modified algorithm, which remains in memory until cleared. Of course, this "Bruce" algorithm would continue to evolve during every run. Perhaps, much like a Concept II rowing machine, the speed control could accept a "smartcard" that would already have "Bruce's" proven and preferred algorithm stored on it. So now when it's your turn to ski you hand the boat crew your handle section and your PP/ZO smartcard and you're ready to go. Just a little futuristic thinking. TW