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05-29-2017, 08:31 PM
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#1
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Newbie
City: lynn ma
Join Date: May 2017
Posts: 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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05-29-2017, 08:36 PM
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#2
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Guru
City: Beaverton, Ontario
Vessel Name: Looking Glass
Vessel Model: Carver 370 Voyager
Join Date: Nov 2012
Posts: 1,240
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No information on your Ocean but welcome to the forum
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Allan
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05-29-2017, 08:55 PM
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#3
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TF Site Team
City: Au Gres, MI
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 11,181
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Welcome also, someone will chime in with some info.
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06-01-2017, 12:28 AM
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#4
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Senior Member
City: Carrollton, Va
Join Date: Sep 2014
Posts: 457
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Quote:
Originally Posted by rteichelII
... 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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Said boat would not be in Chesapeake, Va. would it?
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06-01-2017, 05:14 AM
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#5
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Guru
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 9,207
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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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06-01-2017, 05:31 AM
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#6
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Enigma
City: Slicker?
Join Date: Oct 2007
Posts: 15,332
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Greetings,
Welcome abaad.
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