On my quest to find the "perfect" prop for the 3.0L 135HP Merc / Alpha, I ran across this. I have read many times that there is no free lunch and to get more low we need to sacrifice high, but I have never before seen this prop discussed or evaluated.
Has anyone ever heard of a prop with gears? This is a new one for me. It almost sounds too good to be true. Great pulling power with a 15 pitch then it shifts to a 21 pitch for speed and to keep from over-revving.
Could be the hot ticket for our little 135hp drives that need the grunt to pull up heavy skiers.
Please tell me if anyone has any experience with this prop.