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Old 05-29-2017, 08:31 PM   #1
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1981 ocean alexander 43

Brand new to this site. Also new to trawlers. Have been a power boater for over 50 years. Currently own a 1973 Post 40 convertible as well as the new purchase of the Ocean Alexander. Need to find original specs on prop size, etc. She is a 43' aft cabin with a single Lehman 120 hp. Current prop(when purchased) is a 28x20 three blade. I have not launched yet so I have no idea of the cruise speed, etc. Any and all info regarding the right propeller would would be appreciated. : Thanks.
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Old 05-29-2017, 08:36 PM   #2
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No information on your Ocean but welcome to the forum
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Old 05-29-2017, 08:55 PM   #3
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Welcome also, someone will chime in with some info.
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Old 06-01-2017, 12:28 AM   #4
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Quote:
Originally Posted by rteichelII View Post
... the new purchase of the Ocean Alexander. Need to find original specs on prop size, etc. She is a 43' aft cabin with a single Lehman 120 hp. Current prop(when purchased) is a 28x20 three blade. I have not launched yet so I have no idea of the cruise speed, etc. Any and all info regarding the right propeller would would be appreciated. : Thanks.
Said boat would not be in Chesapeake, Va. would it?
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Old 06-01-2017, 05:14 AM   #5
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For prop size, go to the calculator at boatdiesel.com - weight is important to know. Can your yard weigh the vessel on the slings? With a single Lehman on your (how) heavy vessel you don't want it over propped.

Does previous owner have any speed vs RPM data? During sea trial was a max RPM test done, both in neutral and while underway? Any over heating show up? Last but not least, verify RPM accuracy with a photo tach.
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Old 06-01-2017, 05:31 AM   #6
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Greetings,
Welcome abaad.
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