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Hello All,
I had my propellers checked, repaired and balanced at Wilmington Propellers in Jan, 2016. The report said the propellers were 2″ off. I’m having a hard time interpreting the report for each prop.The Propellers are Michigan Hy-Torq, 18X24, 4 blade, #7 cup, 1 3/8 bore. The engines are Yanmar 4LHA-DTE @ 200 HP. The gears are ZF 450 A, 2.0 reduction. The boat is a Henriques 28 Express. The factory Tachs read about 150 high at 3,000 rpm, so tach at 3,000 rpm and photo tach is at 2850.
Fully loaded, the engines go to 3,500 in flat seas. I interpret this to be 3350 rpm with tach error correction. Fully loaded is with 3 people and bait tank full. At light load, eg. bait tank empty and 2 people, the rpm hits 3550 and I think the governors are limiting the rpm. I think the current propeller setup is close. I run the engines at 3,000 (2850 real rpm), when conditions permit and speed is between 20.5 to 21.5 knots at full load. At light load, speed is 22.5 kts.
Mechanically, everything is good with the engines. They have 1550 hours, all service is up to date.
I think I need to take a little out of the propellers. The question is whether to adjust the current props or buy new. I looking at ACME props, but do not know what size to start at. I’m ready to do a haul out and now is the time to make the decision.
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