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We have a 2000 outrage 18 with 2005 Merc 150 EFI 2 stroke saltwater series.
Million dollar question. What is a good all purpose alum. prop for this boat.
Run in the Cape Cod area. Right now we have a 15 pitch at 5000 rpm.
Thank you
Are you sure the tach is reading correctly? AV plate visible at plane speed? More info on what prop you are using on your set up: dia./ pitch, style of prop.
With that hull and motor, 15 1/4 is a very large diameter. It would probably work a lot better with something in the low 14's for a diameter and about 16 or 17 pitch. No prop expert here, just had a few boats that size.