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I might have worded myself wrong, when I said keep
your weights below the waterline, but the illustration shows the weight at the
furthest possible point beneath the waterline.
George Slaterpryce
----- Original Message -----
Sent: Friday, March 03, 2006 8:46
AM
Subject: Re: [PSUBS-MAILIST]
In naval architecture terms, you are attempting to establish a low center
of gravity and and a high metacentric height (don't ask me for a definition,
its been years since I had the class ;-) ). You need to be careful
with George's explanation when the sub comes out of the water as it might
still roll over with the center of gravity just below the the waterline as the
metacentric height and center of gravity switch positions. Buoyancy is
no longer in the equation. You should strive for a large separation
between center of gravity and the meta centric height.
Respectfully,
Jay K. Jeffries
-----Original Message-----
From: George
Slaterpryce
Sent: Mar 3, 2006 8:30 AM
To:
personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST]
Keel weights.
Weights (usually lead or even solid steel) are
placed on the centerline on the bottom of the boat. This keeps the craft from
rolling, The further the weights are from your center of gravity the more
stable your boat. (see http://www.captovis.com/marine/designsketches/keelweights.png for
one possible configuration). As you design your boat or craft keep try
to keep most of your weight on the bottom of your hull, distribute it as
evenly as you. Basicly keep your weight below the waterline of your sub as if
it where surfaced.
Hope this helps.
George Slaterpryce
----- Original Message -----
Sent: Friday, March 03, 2006 11:54
PM
Subject: [PSUBS-MAILIST]
Folks,
I have not come very far in my
design process except for working throu the hull design and structural
engineering factors.
I am wondering how you maintain
a low centre of gravity so that you stay upright all the time whether with
full ballasts or empty, when the ballast tanks on the photos I see seem to
be placed anywhere from above centre or below?
Regards, Iain.
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