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Old 09-25-2017, 11:08 PM   #1
And
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Post Prop sizing for Mainship???

If anyone has the specs for the prop of a Mainship 400 2003 I sure would appreciate it. It's a singe Cat 3216 385 HP. I don't know the trany ratio.

Or even a good Prop shop in southern CT.
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Old 09-26-2017, 07:44 AM   #2
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If anyone has the specs for the prop of a Mainship 400 2003 I sure would appreciate it. It's a singe Cat 3216 385 HP. I don't know the trany ratio.

Or even a good Prop shop in southern CT.
For prop work I have used Hale in Old Saybrook. Have always been happy with their work.
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Old 09-26-2017, 09:43 PM   #3
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Prop size

Thanx for the response. I'll look into it...
Andy
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Old 09-26-2017, 10:10 PM   #4
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By all means, use a reputable prop shop.
They will provide you with a sheet with tons of questions, transmission ratio being one of them, so start digging in your files, and polishing up the tags for info.
Another hard but critical question is boat weight.
The OEM propellers are likely not what you will need, though it will give you some idea where to start.
Also make a chart of the performance with whatever props are on now, log engine rpm at 100 rev intervals across the range and plug in boat speed, engine and exhaust temp and manifold pressure if available. (With clean bottom and running gear)
Check to make sure the engine is capable of making rated rpm in neutral.
If it won't, fix it before attempting to select new props.
This will all help your prop shop select the right prop for your rig.
If you'd like to understand more on the subject, I would suggest reading Dave Gerrs "Propeller Handbook".
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Old 09-27-2017, 11:33 AM   #5
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Thanx for the response...

Andy
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Old 09-27-2017, 04:48 PM   #6
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I will add, strongly, to get a laser pointer digital photo tachometer for less than $50.00
on E bay. Put a piece of the reflective tape on crankshaft damper use the phototachs to check the revs.
Cheap as they are they are far more accurate than typical dash tachs which are often seen to be wrong by up to 200 revs. You will need good rev info to get good prop work/recommendations.
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Old 09-28-2017, 01:05 PM   #7
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You might find your transmission info in the boat survey(if you had one done)

A little far for you, but I use Scandia in Fairhaven, MA
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Old 09-28-2017, 02:57 PM   #8
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FWIW,

Prop dimensions on my 05 400 with a 370 Yanmar are 26 x 19.5, Shaft 2", and been told by my prop shop that the 19.5 could be varied up to 2".

Don't have the transmission specs handy.
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Old 09-28-2017, 03:30 PM   #9
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You have to get the transmission info on the transmission plate.

Think about the work the engine does and about how it relates to the transmission.

The work the engine does relates to the rpm, transmission, prop diameter and pitch.

The work the engine should do is related to type of hull, length, beam, and tonnage.

I the "does" is more than "should do" you'll be seeing black smoke soon (if you have a diesel) that's a sign of asking too muck work from the engine

Most prop places have a computer program now that needs these inputs.
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