[Public-list] Re: 2 or 3 bladed prop

Dudley Baker dudley.baker at kongsberg.com
Fri Sep 3 09:21:16 PDT 2004

Dear All --
This is first season with our A30 (297).  The boat has a Universal 25XP, (23 HP), with 3-bladed left
handed prop.  I do not have diameter and pitch figures with me.  Prior to splashing, I thought we
would have a engine/prop combination that would give us a comfortable 4.5 to 5 kt cruising speed,
with the ability to dig in when backing down.  Wrongo!  At comfortable cruising rpms, (1800), we are
only getting 3.5 to 3.75 kts, with little control during dockside maneuvers --i.e.,  put her in
neutral 200 yds from the dock, and don't expect any help from a reverse engine order --

Question:  Who out there has a 25XP for an engine and what works best in terms of prop.  -- I am
tempted to venture into the two bladed arena.

Dudley Baker

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Today's Topics:

   1. Question (FINNUS505 at aol.com)
   2. Re: Modified galley and v-berth. (Roger L. Kingsland)
   3. Re: 78 Amp alternator/Atomic 4 (dan walker)


Message: 1
Date: Fri, 3 Sep 2004 08:52:04 EDT
From: FINNUS505 at aol.com
Subject: [Public-list] Question
To: public-list at alberg30.org
Message-ID: <19e.28f71b4d.2e69c2f4 at aol.com>
Content-Type: text/plain; charset="US-ASCII"

Hi A 30'ers,

What size two blade prop are you using with diesels of aprox. 16 hp?  Anyone
have a left hand prop they wish to sell, or know a source for 2nd hand  props?

Which caulk for the stern tube/cutlass bearing housing assembly are you

Lee Trachtenberg
Stargazer #255


Message: 2
Date: Fri, 3 Sep 2004 09:45:01 -0400
From: "Roger L. Kingsland" <rkingsland101 at ksba.com>
Subject: Re: [Public-list] Modified galley and v-berth.
To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
Message-ID: <003b01c491bc$3610db10$be00a8c0 at station13>
Content-Type: text/plain;            charset="iso-8859-1"


Great descrioption, even I understood it after only 3 readings (but I also
would love to see pics).  One question; how do you use the space under the
old ice box (new nav table)?  Is it storage or have you an aft facing seat
with leg room under the nav table?

Roger L. Kingsland, AIA
Managing Partner
Kingsland Scott Bauer Associates (KSBA)
N40° 27' 49"  W79° 57' 59"
3441 Butler Street
Pittsburgh, PA 15201

1(412) 252-1500 X101 - Office & Voice Mail
1(412) 779-5101 - Mobile (no voice mail)
1(412) 252-1510 - Fax

----- Original Message -----
From: "David Fisher" <liquid_addiction at hotmail.com>
To: <public-list at alberg30.org>
Sent: Thursday, September 02, 2004 7:55 PM
Subject: [Public-list] Modified galley and v-berth.

> My Alberg has these modifications.  She was a live aboard for some years
> before I owned her and the former owners put a number of well thought out
> additions in.  The stove, which used of course to starboard of the sink,
> replaced by a Force 10 two burner stove and oven forward, as in that one
> sale.  In the place of the old stove is a refrigerator box.  Another
> refrigerator box is installed in the place of the oilskins hanger.  This
> gives good benchspace for the galley.  Opposite, where the old ice box
> is a nav table.  What is left of the starboard berth has been raised about
> 25 cm. to allow for more storage underneath.  The backrest is gone, with
> cushion extending to the liner.  This extra width allows the space behind
> the oven to be used to make that berth into a quarter berth style
> arrangement.  It is a surprisingly good sea berth, where I can wedge
> in safely and comfortably.
> In the forepeak, the berth has been filled in so that it forms a double
>   To starboard there is storage, fire extinguisher and soon to be bits of
> the collapsible tender I am building.  It works well, I think, however it
> leaves the draws under less accessible.  It also fills the interior in
> than would the original set up.
> For weekending and daysailing, the original interior would definately be
> best, but as my home for at least part of the year and when I sail mostly
> single handed or with one other, I find my arrangement great.  The force
> oven and stove alone make the galley a better cooking areas than what I
> at home.
> David,
> Kalitsah 440, Sydney.
> _________________________________________________________________
> SEEK: Now with over 50,000 dream jobs! Click here:
> http://ninemsn.seek.com.au?hotmail
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Message: 3
Date: Fri, 3 Sep 2004 07:49:40 -0700 (PDT)
From: dan walker <dsailormon at yahoo.com>
Subject: Re: [Public-list] 78 Amp alternator/Atomic 4
To: Alberg 30 Public List -- open to all <public-list at alberg30.org>
Message-ID: <20040903144940.2707.qmail at web52608.mail.yahoo.com>
Content-Type: text/plain; charset=us-ascii

rick is sooooo right about the marine ignition protected alternator and fires

Rick Leach <RLeach at mbayaq.org> wrote:

Good question...I'm interested to hear what the consensus will be. In the meantime, here are some

On a 12 volt system 35 amps is equal to .56 hp and 78 amps is equal to 1.25 hp, a difference of
about .69 hp. If you factor in a generous "fudge factor" of, say, 25% loss due to inefficiencies in
the mechanical-electrical conversion the difference is closer to about .86 hp. The impact of the
additional load will vary with your RPM's. At lower speeds it will represent a greater percentage of
the engine's output. If you're properly propped and spend most of the time running near the "sweet
spot" in the power curve I doubt that you'll notice it very much.

There are some issues with a basic automotive alternator with regard to operating it in a
potentially flammable atmosphere. I believe a proper marine alternator is "ignition-protected" to
minimize sparking that could ruin your day, thus negating any savings.

If you have enough load to justify it, I think a high-output alternator is a good idea, but a proper
marine alternator is essential with a gasoline engine.

Rick Leach
S/V Sugar Magnolia, #121
Monterey, California


Date: Thu, 2 Sep 2004 11:51:26 -0400
From: "Meinhold, Michael J"

I need to replace or rebuild my alternator. Mamock Automotive is offering a
rebuilt Delco that will output 78 amps.
My old one was nominally 35 amps. My question is : should I expect my Atomic
4 to drive this alternator without slowing down much? Anyone have a similar
sized one on an A4?


Mike Meinhold
Rinn Duin #272
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