Hi!

I hope you all are well.

I have a ol Phantom 25 with a 400R spinning a Max5 25 five blade prop to 7,060 rpms. Top speed 89 mph. I am hitting the rev limiter, so I got hold of a Max5 26 to get the rpms down and speed up. The rpm decreased to 6,900 as I expected but speed dropped to 88 mph. We discovered that the 26 could not be rised as high as the 25 pitch prop. With the 25 pitch prop we can run with the propshaft 2 inches above the bottom without any problem. With the 26 max height is 1,5 above.

A friend of mine (high perf boat builder in US) told me that the 26 has more cup than the 25 and it creates more transomlift. And it translates to less height on my boat.

So the question is if the new Max5 25 ST with a diameter of 15,25 will be the trick. If it will give me less rpms and more speed. I can not get the engine higher. The jackplate is at the highest with the propshaft 2 inches above.

What do you think?

Cheeers, Toffen

Why not have BBlades or FJ propeller work the current Max 5 25 to get the results you are looking for?