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Old 03-31-2020, 09:16 PM   #21
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City: Crockers Boat Yard, New London, CT
Vessel Name: Lemon Drops
Vessel Model: 2001 Grand Banks Europa 52
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Thanks everyone for your contributions.

I went back and reviewed my survey from 5 years ago. This is the verbiage from the survey:

Performance Results:
1200 RPM - 8 MPH, 2700 RPM - 14 MPH, WOT 3600 RPM - 24 MPH.

The survey was on an inland lake with no wind or current. I was mistaken at the max RPM of 3450. To date, I have not pushed the engines much beyond 2900 RPM and I was in a passing situation on a tidal river and was not paying attention to the speed (Was trying to pass a barge)

My question resolves around experimenting with changing the props that were on for the sea trail above (which were 24"x24") which are on now, to the "spare props" that I intend to mount that are 26"x24".

What changes can I expect with the 26"x24" props with respect to WOT, cruising speed, and fuel efficiency.

I realize this is an open question, but I do appreciate your thoughts and recommendations.

Jim L
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Old 03-31-2020, 09:34 PM   #22
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City: Chesapeake Bay
Vessel Name: Blue Heaven
Vessel Model: Mainship 430 Aft Cabin
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Your boat seems to be quite quick! My numbers are
7.5 mph @ 1200 rpm
18 mph @ 3000 rpm
If you change to a larger diameter but same pitch then you will see a lower WOT rpms but higher speeds at the same rpms compared to what you have now. Given that your WOT is 3600 you have plenty of room to load up the prop and get better performance. Just make sure your WOT doesn’t drop below 3400. It was also be worth checking your actual engine RPM using a tachometer to calibrate your tachs so you know they are telling the truth.
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Old 04-01-2020, 09:19 PM   #23
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Thank you, this information is what I was looking for.

Jim
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Old 04-02-2020, 09:34 PM   #24
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TJ, Have you recorded your WOT RPM with the props you currently have?

Jim
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Old 04-03-2020, 05:10 AM   #25
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Yes. 3400 rpm.
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Old 07-21-2021, 07:48 AM   #26
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Mainship 430 refrigerator

We currently have 2 - refrigerator/freezer units stacked on top of each other. Each unit is approximately 2.5 cu. ft. Thinking of replacing with 1 - 8 to 9 cu. ft. refrigerator/freezer unit. Does anyone have experience and advice with this project? Thanks in advance.
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Old 08-03-2021, 11:38 AM   #27
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I had a 2005 MS 430PT with twin 440 Yanmars. I put 3,000 hours on them in 6 years and never had a problem. I sold that boat in 2019 and it is still going strong. The issue with the burned valves was on a Hinkley jet drive boat and was determined to be a mismatch. Wrong engine for the jet drives. I now own a 20077 Mainship Pilot with twin 440 Yanmars and have not had any problems. Do the research to find out what the issue was before you condemn the 440's. They are excellent engines and will give years of trouble service.
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