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From: Robert Gainer (no email)
Date: Sat Jul 31 2004 - 08:12:53 EDT
Tom,
The approximate formula for moment to trim 1” is .35A(squared)/B. Where A is
the area of the water line and B is the beam at the water line. A is
squared. So if your WL length is 52 feet and your WL beam is 13 feet I get
an approximation of 7,000 foot-pounds to trim 1”. And that is ˝” at the bow
and ˝” at the stern. So 1,600 pounds moving 15 feet is 24,000 foot pounds
and divide that by the 7,000 foot pounds to trim 1 inch and you will trim a
total of 3.4 inches. Again divide that into trim at the bow and stern so the
bow will go up, 1-3/4 inch and the stern will go down 1-3/4 inch. For the
nitpickers out there the center of flotation is a little aft of the center
of the boat so the bow will trim up a little bit more and the stern will
trim down a little less. The difference is about 5% more at the bow and 5%
less at the stern. Check my math, and I am guessing at your dimensions.
All the best,
Robert Gainer
>From: "Je Ne Se Pas" <>
>Reply-To:
>To:
>Subject: [world-cruising] moving batteries to another spot
>Date: Fri, 30 Jul 2004 21:59:14 -0000
>
>Hi All,
>
>We are having currently 6 x 8D as the house battery and we are about
>to upgrade to some serious batteries (840 pounds).
>
>The new batteries weight approx. 1600 pounds and will not fit in the
>old spot.
>
>The current batteries are about midship and about 1 foot in from
>starboard (not the best place you would think).
>
>We have space just after the engine room, right on the center of the
>boat. beam wise we would move only a few feets, but length wise we
>would shift a lot of weight about 15 feet further aft.
>
>Now... we are talking about a 35 metric tons 60 foot boat here, so in
>my opinion it should not make to much a difference, but I would be
>really interested in your opinion.
>
>Thank you, Tom
>
>
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