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Hi I'm trying to prop a 2013 Evinrude 150 on a 2000 21 foot Hurricane deck boat. The boat belong to my brother, and it has provided many years of service, and thousands of incredible memories. As purchased it was always under propped. It had a 150 fiSHIT Johnson with a 15x19 3 blade Aluminum. On the new motor the problem was 1000 times worse. I decided to try a 4 blade 14 3/8 SS 21 pitch, and the boat was awesome. But was still missing something, and only getting 4200 RPM full throttle trimmed down. I could trim up to optimum rpm 5200 but speed caps out around 4800. I know 21 pitch is too much.
Rather than trying to test 5 other props, I figure I would come here to have a look at the communities expertise. Im thinking 19P four blade, maybe a 15P 5 blade. Thanks a ton for any help everyone.