I've got a couple questions on this Hydromotive X-OT but no takers yet. This isn't the big barrel hydromotive that most are familiar with. It's basically the round ear blades from the big tube prop on the smaller tube of the quad IV. On my XB21/225X, it would run 77MPH on the rev limiter (6850) with 4 guys in the boat, livewell full, big cooler, etc., AND it got there quick. Because I hardly ever carried that kind of load, this prop only came off the wall a couple times a summer. I also used it for the same purpose the last year I had my XB03 with the same motor. The numbers were spot on about the same and it really launched the 03 out of the hole.