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 Catalina 25 Specific Forum
 C-25 Prop for Universal M-12		  New Topic  Topic Locked
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Daren
1st Mate

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USA
81 Posts
Initially Posted - 11/05/2008 :  10:14:33  Show Profile  Visit Daren's Homepage
I think my boat is overproped and need to replace the existing prop. Does anyone have a recommendation of a replacement prop for a C-25 with an inboard universal M-12 (11hp) engine?
S/V Prima Donna
1986, 15 HP Universal Inboard Diesel, Fixed keel, Hull # 5362
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32chevcab
Deckhand

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12 Posts
Response Posted - 11/06/2008 :  07:29:33  Show Profile
I have a 1986 with a M12 and it has a folding two bladed prop when I bought it. It was made by Martec; the Eliptec model, the prop has the following stamping "RH 12D X 10P". I assume the RH stands for right hand rotation, 12D is 12 inch diameter and the 10P is 10 inch pitch. I also have a fixed two bladed prop which I got with the boat. It has a the following stamping "Austral 11 RH" on one side and "B11" ? hard to read. It is 11 inch diameter but I have not measured the pitch. My engine is able to rev to max of 3500 rpm and seems to cruise at 2500 rpm at 6. knots with the folding prop.
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Daren
1st Mate

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USA
81 Posts
Response Posted - 11/11/2008 :  10:27:31  Show Profile  Visit Daren's Homepage
I am sure the mechanic is correct. My engine is over propped. My screw is three blades!
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.