@Scott RussellThe very first PP was speed based, it was terrible. Then came rpm based, the driver had to add rpm for crew weight, the anticipated pull of the skier, and wind (and current if in a river). It was a big guessing game and some skiers loved it because they could "pull it down" and get a slow but in tolerance time. There were magnets under buoys for the timing. If you didn't pull, it would go really fast. It came in hot at the gate.
Then came PP Stargazer: was "GPS based" it came in hot at the gate too, then changed speed at the 3 ball (heinous and ridiculous )
apparently with lots of inputs, one can get stargazer to work pretty well, and I guess Z-box is close to Zero Off.
The limiting factor is response time via a throttle cable.
ZO is always tbw with accelerometers. No inputs from the driver except for the skier's choice of pull type and speed. If you select 34 mph and just stand there, it goes 34 mph. If you pull really hard, it pulls back. It tries to get a perfect time.
New boats are much wider and heavier. New engines are really strong, they don't need to be at their peak torque curve, I don't think, the manufacturers prop them accordingly. ZO needs to know your engine size and prop. I think our 6.2 L 2020 prostar goes maybe 40 mph at 6,400' above sea level. Not sure what the rpm's are at 36 mph, but higher than older engines.
I have a '97 Nautique with pp (not Stargazer) that I still love to freeski behind. No way would I run it in the course. I’m not sure anyone that skis tournaments would choose to train behind a pp boat if they have a choice.