Ok I have repowered my 1989 BAHA 28ft weekender and need some help choosing the correct prop. as of now the current prop is a 4 blade 18 X 14 pitch . At WOT 4900 rpm I'm running at 23 knots . Boat is around 8500lb transmission is 1.88 gear straight drive c71 New GM 8.2 415hp . This is a fishing boat and not built for speed .
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repowered boat prop help needed
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Provided your numbers are correct, this prop is rather highly loaded, and is working with some cavitation. All fixed structures ( keel, brackets aso) in front of the propeller must be streamlined and smooth. The prop might be a bit happier with some cup added to the trailing edge of the blades.
In addition, check the tacho calibration and total weight of the boat, it seems something is not quite on spot. Any pictures of the bottom and the shaft supports?
In addition, check the tacho calibration and total weight of the boat, it seems something is not quite on spot. Any pictures of the bottom and the shaft supports?
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