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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 The right propeller		  New Topic  Topic Locked
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SteveG
1st Mate

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51 Posts
Initially Posted - 03/10/2007 :  15:31:57  Show Profile
Hi All,

I have to buy a new prop for my Mercury 9.9 and I don't know which one to buy. I saw a post in the archives saying good things about a 10 X 7.625 4 blade prop. I'm not sure if the 10 is referring to the pitch or diameter.

The prop I have is 3 bladed 9 inch in diameter and I don't know what the pitch is.

Can anyone help me pick the right prop?

Thanks,

SteveG
Steve Gravel
Portsmouth, RI
C25 - 'Lady Jane'
SR/FK
Edited by - on

tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 03/11/2007 :  10:55:14  Show Profile
Steve,
I suppose the 10" refers to the diameter. I can't imagine a 7" prop with a 10" pitch.

Do the numbers on the old prop as compared to the one that you intend to buy.

Val on the hard DAGNABIT # 3936, Patchogue, N.Y.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 03/11/2007 :  12:29:29  Show Profile
Steve,

Is your Merc 9.9 a two or four stroke?

How was your overall performance with the 9" prop?
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 03/11/2007 :  13:33:49  Show Profile
A Merc dealer should be able to determine or look up what prop you had--usually they're a standard size and pitch on smaller outboards. Is it not imprinted somewhere on the hub?
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KenDavis
1st Mate

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USA
69 Posts
Response Posted - 03/12/2007 :  12:53:19  Show Profile
I'm interested in this too. My Mercury 9.9 (2-stroke)
has marked on it's propeller A12 9P.

it seems like I am at 3/4 throttle for a decent boat speed.
I'm hoping that a different pitch propeller would give me the same speed at something like 1/2 throttle with increased power/maneuverability at lower RPM's.

just begining this search and havn't actually measured boat speed yet

let us know what you end up with and how it works out

Ken
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 03/12/2007 :  18:35:31  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by KenDavis</i>
<br />I'm interested in this too. My Mercury 9.9 (2-stroke)
has marked on it's propeller A12 9P.<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Ken,

My prop is also marked A12 9P, which appears to be a standard issue 9" diameter 9" pitch propeller for 6-8-9.9-15 HP 2 strokes. The "A12" is in the prop part number so it must relate to the type of outboard it is compatible with.

[url="http://www.mercurypartsexpress.com/PartsExpress/ProductSelection/Accessories/getProductGroup.asp?CID=167163190070230063262&lvlOneKey=74&key=9929&level=3&store=Accessories"]Mercury Black Max Propeller[/url]

A while back, I experimented with a 9 3/4"d x 6.5"P on my 8hp Merc 2 stroke, but performance was rather dismal. I put the 9x9 back on.

Edited by - dlucier on 03/13/2007 09:22:59
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KenDavis
1st Mate

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USA
69 Posts
Response Posted - 03/13/2007 :  09:09:29  Show Profile
so should we be looking for a pitch of something like 10?
also, some high thrust props are 4 blade. what pitch would they be?

the mercury link shows three available stock props 6.5,7.5, and 9.

ahh prop mysteries...
at the moment I'm rebuilding the water pump, and will be happy if I have it together and back on the boat by the weekend.

Ken
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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.