I have recently purchased a 2015 MF755 with a Honda 150hp outboard.
She has been out of the water for a couple of weeks whilst I fitted a diesel heater, more batteries, fridge etc.
Prior to this work I took her out a few times and was able to get a good 25kts in good conditions. Since relaunching I was firstly only able to hit 18-19kts at 4600rpm and then 20.5kts at 4800rpm the following day in ideal conditions and with 4 adults + plenty of food/drink onboard. Bottom is (relatively) clean.
The engine has only done 70 hours and has just been serviced. The prop is a 15.5 x 17" 3 bladed aluminium.
I feel that the pitch is too large with the weight I have added now but can anyone advise what I should go for with this set up? I don't mind sacrificing top end speed for economical cruising.
My Previous boat was a 695 and I now have an 895. I did a lot of prop testing. And I looked at a lot of performance data on Capt'n Ron’s 795. Based on that experience I’m pretty sure the right pitch for your 795 and 150 Yamaha would be 14”. I don’t recall the prop diameters. But the standard Yamaha saltwater series II 3 blade should be good. I’d go with a top quality stainless prop like one from Yamaha or PowerTech. BTW, on my 895 I had to go to a 4 Blade prop made by PowerTech to get sufficient grip. You should not need that for your 755.