[Public-list] Engine Question

[Albert Fleury]

Mike,
What engine do you have? I have an 11 hp Vetus with a 2 blade prop and would 
like to switch to a 3 blade for improved cruise speed and backing ability 
and wonder if the 12 inch x 12 would work well for me?

Al Fleury
# 131 "Moonshadow"


>From: "Mike Lehman" <sail_505 at hotmail.com>
>Reply-To: Alberg 30 Public List -- open to all <public-list at alberg30.org>
>To: public-list at alberg30.org
>Subject: RE: [Public-list] Engine Question
>Date: Tue, 20 Sep 2005 16:37:42 -0400
>
>Jon,
>
>I have a 12"x12 3-blade on my boat and it works fine. 12" is better than 13 
>on the A30 because of the aperature opening. With 12" you reduce the amount 
>of prop wash and noise. As for the pitch, that should be determined by the 
>power curve of the engine, shape of the hull, displacement of the vessel - 
>-lot's of factors. A test is to see if you can get max rated RPM for the 
>engine when it is in the water. You will never run the engine at that speed 
>but you should be able to reach it [or close to it]. You cruising speed 
>with a diesel is generally around 75% of full throttle. Many people 
>over-prop and 'labor' their engines with too low RPM which reduces power 
>and effiency. Hope this helps
>
>BTW, The prop can be re-pitched for fine tuning but there are limits as to 
>how much. If I remember correctly it is 2" in either direction so....a 
>12x13 can be repitched to 12x11 or 12x15
>
>
>
>Mike Lehman
>~~~_/)_/)~~_/)~~~
>
>
>
>
>----Original Message Follows----
>From: "Jon Budington" <jon at globalprintinginc.com>
>Reply-To: Alberg 30 Public List -- open to all <public-list at alberg30.org>
>To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
>Subject: RE: [Public-list] Engine Question
>Date: Tue, 20 Sep 2005 16:26:37 -0400
>
>Stephen,
>
>Just checked my notes, and the prop specified is a 12" 13 pitch.  Any
>thoughts on that size?
>
>Jon
>
>-----Original Message-----
>From: public-list-bounces at alberg30.org
>[mailto:public-list-bounces at alberg30.org]On Behalf Of sousa, stephen
>(ENG)
>Sent: Monday, September 19, 2005 2:43 PM
>To: 'Alberg 30 Public List -- open to all'
>Subject: RE: [Public-list] Engine Question
>
>
>Jon,
>
>I have the same installation in #114. They made Z-Brackets which the motor
>mounts are mounted. Which Yanmar are you installing in the Alberg? You
>should verify that they are providing a new propeller with the 
>installation,
>the Campbell which is a 12 or 13 X 7 pitch will not work well with the
>Yanmar.
>
>Stephen
>
>-----Original Message-----
>From: public-list-bounces at alberg30.org
>[mailto:public-list-bounces at alberg30.org] On Behalf Of Jon Budington
>Sent: Monday, September 19, 2005 2:28 PM
>To: Alberg 30 Public List -- open to all
>Subject: [Public-list] Engine Question
>
>
>I am in the process of replacing my Gray Marine with a new Yanmar.  The 
>work
>is being done by a local engine service company in Annapolis.  I went to
>check on the progress of the job this weekend and was surprised to see the
>new engine laying on the old Gray beds.  The new engine is narrower, and 
>the
>mounts do not line up.  To compensate, the mechanic manufactured plates to
>bolt to the old beds - the new engine mounts are bolted to the plates.  
>Does
>this sound correct?
>
>Thanks,
>
>Jon Budington
>Nimble #67
>
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