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Old 07-09-2018, 08:17 AM   #1
City: Jacksonville
Country: United States
Join Date: Jul 2018
Posts: 2
34' Mainship prop size

I have a 2005 34' Mainship trawler with a single diesel Yanmar. It has a cavitation problem with the 4 blade prop. I have heard Mainship went to a 5 blade prop to solve the problem. Does anyone know the size of the recommended 5 blade prop.

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Old 07-14-2018, 08:58 AM   #2
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City: Highland Beach, Florida
Country: USA
Vessel Name: Miri
Vessel Model: Mainship pilot 34
Join Date: Feb 2014
Posts: 57
Before you spend several thousand dollars on a five blade prop make sure your original prop is balanced and does not have any dings. Also make sure your shaft zinc is tight and not terribly worn. Any of these issues could sound like cavitation.

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Old 07-14-2018, 12:00 PM   #3
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City: Westport
Country: USA
Vessel Name: Osprey Moon
Vessel Model: Mainship 34T
Join Date: Oct 2015
Posts: 47
I have a 2009 Mainship 34T single yanmar and it has a 4 cavitation issues. Oak's advice to check all things out first is the way I'd go. When we checked our prop at first haul out after purchase we found each blade has its own angle and some "pinkish" corrosion/etc. Had it tuned and kept as spare and bought a new Nibral 4 blade.
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Old 07-14-2018, 05:44 PM   #4
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City: Seneca Lake NY
Country: US
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 3,851
We also have no problem w our 4 blade prop on an'08 MS 34HT w single Yan.
I had a goid prop shop check balance & cup when we bought the boat all was well and runs smooth.
2008 MS 34 HT Trawler
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Old 07-20-2018, 08:28 PM   #5
City: St Andrews
Country: Canada
Vessel Name: Tenacity
Vessel Model: Mainship34
Join Date: Jul 2018
Posts: 6
Does anyone know what size prop came as original on 1984 Mainship 34 withperkins turbo and I believe 2:10 transmission
Just bought the boast but it smokes past 1800 rpm .... I think too much pitch.
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