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Old 10-20-2017, 06:38 AM   #21
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Greetings,
Mr. OD. You have noted the most important aspect of water ballast. Full or empty. No in-between. FSE... What is Free Surface Effect | Marine Notes
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Old 10-20-2017, 07:27 AM   #22
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Originally Posted by RT Firefly View Post
Greetings,
Mr. OD. You have noted the most important aspect of water ballast. Full or empty. No in-between. FSE... What is Free Surface Effect | Marine Notes
I am ex sub sailor so I know these things.
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Old 10-20-2017, 08:26 AM   #23
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Old 10-20-2017, 10:22 AM   #24
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Quote:
Originally Posted by Islanddreamer View Post
Also- where would you get lead pigs?
Here's one place to get them....
https://www.rotometals.com/cut-in-ha...ight-included/

I have some lead downriggers for ballast forward that offset the increased weight of the diesel aft (it was remotored in '07).

Also known as an Alaskan sleeping pill....
https://www.fisheriessupply.com/lead...-rode-sentinel

And you guys with distributed ballast are right on. Engineer-speak, the effect on moment of inertia is squared with distance from the center of gravity/mass.
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Old 10-20-2017, 12:47 PM   #25
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Halsey's Typhoon

Seems as though there are several threads on this subject of ballast, and this other one has a greater number of postings. So I thought I dupplicate this posting over here:
Trawler Forum - View Single Post - Ballast?

Quote:
Halsey's Typhoon
While on vacation this summer I was given a book to read by an old friend.
The book:
Halsey's Typhoon
What a GREAT book!!

some excerpts

synopses
"Describes how, at the height of World War II in the Pacific Theater, Admiral William "Bull" Halsey unwittingly sailed his undefeated Third Fleet into the heart of a powerful typhoon while supporting General Douglas MacArthur's invasion of the Philippines, a destructive act of nature that devastated the fleet and inflicted untold damage and loss of life."

One item that becomes apparent is how a number of the destroyers and destroyer escorts succumbed to the seas due to extremely low fuel loads (lots of trouble refueling at sea due to the bad weather), and the addition of lots of new hardware (radars, etc) to their upper superstructures.....lost of some of the stability they had been designed to originally.

GREAT book and story
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Old 10-20-2017, 01:00 PM   #26
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Greetings,
Similar... https://www.damninteresting.com/the-...-the-eastland/
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Old 10-20-2017, 02:04 PM   #27
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Years ago there was a maker of an anti roll system for commercial boats the was basically 2 tanks on opposite sides that restricted flow between them. Don't know if they're still around. Probably too big for yachts unless you could utilize existing tanks.
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