[Public-list] Engine Question

[Jock McClees]

I had a three blade prop which wasn't very effective and switched to a 12"
two bladed prop with the standard pitch.  I found I couldn't run the engine
too fast or it would cavitate. Larry Morris said he had the same problem on
his.
Jock McClees

----- Original Message -----
From: "Mike Lehman" <sail_505 at hotmail.com>
To: <public-list at alberg30.org>
Sent: Tuesday, September 20, 2005 3:37 PM
Subject: RE: [Public-list] Engine Question


> 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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