Do you still have the 16x10 3 blade prop? I ask because I want to replace my 2 blade prop with a 3 blade, and the Victoria Propellers calculator indicates a 15x8 3 blade will drive the Gulf 32 at hull speed with the 32 hp Universal 5432. Thanks for the insight.
Hi Susan, Yes we do. At the time I had the prop re-pitched, Schooner Marine in PDX said the 16X10 was a good fit, but it had been a 16X12 I think, and would come up to hull speed at much less than the recommended 80% of max RPM, or 2200. Now, with the 16X10, she comes up to hull speed in calm water at about 2150 or so.
It may well be that a 15X8 three blade would work well, but I have to say after my many and repeated experiences with rough conditions, that I have never felt like I wanted less prop in the water. She comes up to hull speed at the proper RPM, and when you are fighting opposing current and a 4-8 foot swell in your face and struggling to manage 1-2 knots SOG, you may find as I have that you are grateful for the 16X10.
Let me know what your experience is, and best wishes.
Thanks for the feedback. I re-ran the numbers and came up with 16x10 3 blade. I must have fat fingered something the first time. I saw you went with the R&D flex coupling. Did you use the 910-014 (3hp/100rpm) or the 910-001 (5hp/100rpm)? I calculated the Gulf 32 installation at 2.34hp/100rpm. Thanks again!
Sorry for the delayed response. If you still check this, I honestly don't recall which R&D I used and would have to dig around and look it up. All I can say is that I recall it being straightforward and not a source of real dilemma. If I don't mention it in that blog post I would ask one of the marine shops in your area what they use.
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Do you still have the 16x10 3 blade prop? I ask because I want to replace my 2 blade prop with a 3 blade, and the Victoria Propellers calculator indicates a 15x8 3 blade will drive the Gulf 32 at hull speed with the 32 hp Universal 5432. Thanks for the insight.
Hi Susan,
Yes we do. At the time I had the prop re-pitched, Schooner Marine in PDX said the 16X10 was a good fit, but it had been a 16X12 I think, and would come up to hull speed at much less than the recommended 80% of max RPM, or 2200. Now, with the 16X10, she comes up to hull speed in calm water at about 2150 or so.
It may well be that a 15X8 three blade would work well, but I have to say after my many and repeated experiences with rough conditions, that I have never felt like I wanted less prop in the water. She comes up to hull speed at the proper RPM, and when you are fighting opposing current and a 4-8 foot swell in your face and struggling to manage 1-2 knots SOG, you may find as I have that you are grateful for the 16X10.
Let me know what your experience is, and best wishes.
Thanks for the feedback. I re-ran the numbers and came up with 16x10 3 blade. I must have fat fingered something the first time. I saw you went with the R&D flex coupling. Did you use the 910-014 (3hp/100rpm) or the 910-001 (5hp/100rpm)? I calculated the Gulf 32 installation at 2.34hp/100rpm. Thanks again!
Sorry for the delayed response. If you still check this, I honestly don't recall which R&D I used and would have to dig around and look it up. All I can say is that I recall it being straightforward and not a source of real dilemma. If I don't mention it in that blog post I would ask one of the marine shops in your area what they use.
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