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Old 03-26-2018, 07:16 PM   #21
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I also have a Mainship 400 T with the same prop. The standard prop from the factory was a 4 blade. The 5 blade pro was an option. When shopping for my boat I saw more 5 blade singles engine Mainships.
Thinback,

That's what I see in the Mainship community. Most have the 5 blade option, and I don't understand why.
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Old 03-26-2018, 08:16 PM   #22
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I’m not sure why either, I would like to ride on a 40 with a 4 blade to see how it feels. All of my prop knowledge is learned from racing outboard hydroplanes and runabouts. 4 blade or 5 blade on a hydro really worked well, it drove the boat thru the corners better kind of like 4 wheel drive in the snow. On a runabout I never really like it the extra hooked up feeling just two awkward.
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Old 03-26-2018, 08:31 PM   #23
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Thinback and Seevee,
Call the prop guy Maerin referenced a few posts ago.
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Old 03-26-2018, 09:42 PM   #24
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Thinback and Seevee,
Call the prop guy Maerin referenced a few posts ago.

Digital Prop Shop

Full disclosure: This was in April of 2007 and I've not needed to contact them since the work on the prop was completed. I guess that puts me in the category of satisfied customer. Still, a lot can change in almost 11 years. YMMV!!
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Old 03-26-2018, 10:23 PM   #25
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Ski,

Yes I have a full keel, but managed to bang it up twice. Both times I let someone else drive the boat. Never again. I'll always be in command when docking, or entering a channel or area that's questionable. And both could have easily be prevented. This last one is costing me BIG bucks and BIG time delay for my Loop trip. Errrrrr!

I rarely run wide open, 99% of the time at hull speed... 7 to 8 knots.
Looking forward to a 4 blade.
Seevee....
OK, I now get the thinking on the spare. I tend to view these things through the prism of my own experience as most of us will. I've ridden over logs that hobby-horsed the boat, soft groundings, plowed a furrow through mud, and the prop never suffered so much as a ding, well, except for eating a crab trap, I think. A ding that a quick touch with a 5" wheel fixed. But it's very well protected, so for me a spare doesn't enter the picture.

I can see how for you it makes more sense, particularly if you're looping. A 5 blade probably makes for a smoother, quieter ride. Since you already have one, it might make sense to tune it up and enjoy the quiet for all those potential miles. But the prop shop would be better qualified than anyone to advise you. There have to be plenty of shops in your neck of the woods who do the digital scanning. I doubt if it's cost effective to have it done in Deale, MD. even if they're really good.

Best of luck in finding the best solution.
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Old 03-27-2018, 07:19 AM   #26
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I had my prop worked by black dog propellers here in Stevensville. My full load ( ( fuel,water,food,dinghy and family.) RPM was down 200 rpms, photo tach versus tachometer. They loosen up the prop tuned all blades and balanced. I can’t wait to try it out.
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Old 03-27-2018, 10:57 AM   #27
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Morning SeeVee,
do you know the rotation and shaft size? I have freshly reconditioned RH Nibral four blade (super cup?) I think it is 24" x 27P with a 1-3/4 tapered shaft fitting. It is in my boathouse, if you have any interest, I can go get the exact specifications.
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Old 03-27-2018, 03:07 PM   #28
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Morning SeeVee,
do you know the rotation and shaft size? I have freshly reconditioned RH Nibral four blade (super cup?) I think it is 24" x 27P with a 1-3/4 tapered shaft fitting. It is in my boathouse, if you have any interest, I can go get the exact specifications.
Thx, but won't work. In a four blade I'll need a 26-22 pitch, or a 26-24 pitch. I'm having things analyzed to be sure what is best.

Larry
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