[Public-list] Boat Trim

[Roger L. Kingsland]

Michael,

I applaud your focus on performance and would like to learn more about boat
trim.  You mention "original marks,"  how did you determine what they are.
All I have done is use a level to mark horizontal while the boat was
floating and set the trailer tongue to match that "level line."  What I
don't know is if the boat was "on her marks" when I did the measurement.

Relative to tanks, the only change I have made aft is to move the 11 gallon
(90+/- pounds max.) diesel tank from the starboard cockpit locker to under
the cockpit sole (aft about 2').  I am planning on 2-20 gallon tanks under
the aft end of the V berths; a holding tank and a water tank.  Assuming one
fills as the other empties, this would add about 170 pounds 1' forward of
the mast.  However, I plan to use the existing water tank (250 pounds max.
about 4' forward of the mast) as a back up for longer trips.  I have also
thought of moving the batteries forward with one under the head and one at
the bottom of the hanging locker.  Lastly, I did kick around the idea of a
larger fuel tank under the cabin sole but, shazzam, that would be a bunch of
work.

I guess the main question is what is the ideal trim of the boat and how does
one measure it?  For example, if I knew where along the keel the boat should
"balance" (either with or without equipment and gear) it would be a simple
matter of calculating the moment arm of each major load to achieve the
proper balance.

I have also heard that concentrating the weight near the center of  a  boat
reduces "hobby horsing" but don't know how one could centralize the weight
effectively on an A30 without major modifications.  Your thoughts would be
greatly appreciated.

Roger Kingsland

----- Original Message ----- 
From: "Michael" <dickdurk at intercom.net>
To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
Sent: Tuesday, August 17, 2004 7:09 PM
Subject: Re: [Public-list] Propane Locker


> >The rhode locker could be modified
> >with an air tight raised floor that slopes to drain holes in >either side
> of
> >the hull.
>
> It seems you are much more willing to live with propane inside the hull
than
> I; but getting the weight forward is a step in the right direction. Keep
in
> mind it is a 30'3" LOA hull with a 21' waterline, and is already sensitive
> to weight in the stern. You mentioned in a previous post putting extra
> tankage aft in the sail lockers- I don't know how you will compensate trim
> wise; my boat sits on her original marks only when she has no cruising
gear
> on her.
>
> I recognize cruising sailors don't care about boat speed, but at some
point
> dues need to be given to the fact the Alberg 30 is a really sweet sailor,
> why destroy her best characteristics? I think all the talk on the list
about
> engines, wheels, packing glands, etc. we forget she is primarily a SAIL
> boat.
>
> I am accepting the mission to do something about that focus ;-)
>
> Michael Grosh
> #220 Checkmate
>
> P.S. I know just the Captain for you-he goes by the name of Stump. 1600
ton
> unlimited waters <G>
>
>
> _______________________________________________
> Public-list mailing list
> Public-list at alberg30.org
> http://alberg30.org/mailman/listinfo/public-list
>
>



 1092838962.0