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Old 11-10-2009
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Question Prop on PSC 31

For those of you with a 31, what prop do you use (2or 3 blade, folding/reversing, pitch etc). I find that as I am motoring down the ICW every boat in the world passes me by. The bottom is clean, the engine rebuilt and not very much weight on board. I can't determine why I am so slow. (Of course the problem is that we are motoring and not sailing!!!)

PSC 31 #56
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Old 11-10-2009
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I have a 3 blade Campbell Sailer on mine. I can do 6 knots in calm water but I am a little over pitched because I can only reach about 2900 rpm. The 2 blade Michigan that was on the boat when I bought it didn't seem quite right but I didn't have much experience with it as I changed props right away.

Adam Owens
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Old 11-11-2009
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Maxprop (3 blade). It's great for reverse, great for sailing as it feathers and no complaints underway. I have no difficulty reaching 3400 RPM. I don't like to motor but when necessary it goes about 5kt at 2400 RPM in calm water.
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Old 11-11-2009
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I moved a PSC31 with a 3-blade fixed prop from the boatyard to our dock last week, and she motored comfortably at about 5.5 knots at a cruising RPM of 2400-2500. Based on the max RPM, she could be run a little harder than that, maybe closer to 6 knots at 2600 or so, but I wasn't in a rush.
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Who is staring at the sea is already sailing a little.
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Old 11-11-2009
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I ran the stock two-blade for the full 15 years I owned the boat. It was the right size based on max RPM and boat speed. With a clean hull she did 5 knots at 2000-2200 rpm. I never saw the need for the additional drag of a 3 blade and I did not want underwater parts requiring maintenance(folding or feathering). The only real advantage I saw to a 3 blade, based on my sailing other boats, was much better response in reverse.

Larry
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Old 11-11-2009
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Quote:
Originally Posted by mcgray View Post
For those of you with a 31, what prop do you use (2or 3 blade, folding/reversing, pitch etc). I find that as I am motoring down the ICW every boat in the world passes me by. The bottom is clean, the engine rebuilt and not very much weight on board. I can't determine why I am so slow. (Of course the problem is that we are motoring and not sailing!!!)

PSC 31 #56
I have a 2 blade, do about 5 knts @ 2400 in calm water. I feel your pain,
especially in the lower florida section with all those bridges. The problem
is your waterline is only 24', compared with those bigger boats with 36'+
waterlines, you don't have a chance. I compensated by getting up earlier.
At the risk of stating the obvious, go offshore if you can.
Tom
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Old 11-12-2009
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31 speed

I have a two blade standard prop. My '31 runs at hull speed (6.5 knots) at 2900 rpm. I always run at that rpm under the impression it is supposed to be better for the engine.

The main is up so maybe I am getting a boost there. I should check with no wind to be sure.

John
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Prop on 31 and RPMs.

MIne has a three blade prop, don't know the pitch. I usually run at 2400 and on a calm day and not significant current can get 5 kts. I have never run it for long at 2900, maybe I should increase the RPMs.
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Old 11-12-2009
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Any of the diesel mechanics will tell you that you will do more harm by babying your diesel than you will by running it near full load. Running it routinely at 2000-2200 is just not enough. You should think more about 2900-3100 for cruising, some say even more. In any event, your prop size and pitch needs to support that.
Larry
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Old 11-12-2009
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cruising rpm

My hull 128 has a yanmar ygm30 which was subjected to a sea trial and certified by Mack Boring.

I was advised to cruise at 2/3 maximum rpm, both by the dealer and Mack Boring.

This puts me at right around 2200-2300 rpm. I have not yet figured out what that translates in to average speed over water, as I have only been using the speedo on the gps. It appears to be in the 4.5-5kt range.
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