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Proper prop selection for 466 MY in Fresh water?


Looking for some experience on prop selection for my 466 in fresh water. I previously ran the boat in saltwater where WOT was about 2655 rpm @ 26 mph. The props have recently been reworked (28 x 28) and are very smooth running, however I am not seeing the speed that I have seen on the specs for he 466 of 32 mph with 1-2 foot seas. Since we hve moved the boat to fresh water my WOT is around 2450 rpm and my speed is only around 23 mph. Now I understand this isn't a speed boat, but I am looking for optimal fuel efficiency and performance. I have heard that you may have to drop two pitch sizes to achieve the proper WOT. If anyone has input on this I would sure appreciate it. Also FYI, I am running the Volvo 74 TAMD's 480 HP, and they appear to be running well. Thanks

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