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10-20-2017, 06:38 AM
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#21
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Enigma
City: Slicker?
Join Date: Oct 2007
Posts: 15,424
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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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RTF
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10-20-2017, 07:27 AM
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#22
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Guru
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 9,623
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Quote:
Originally Posted by RT Firefly
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I am ex sub sailor so I know these things.
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The meek will inherit the earth but, the brave will inherit the seas.
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10-20-2017, 08:26 AM
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#23
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Enigma
City: Slicker?
Join Date: Oct 2007
Posts: 15,424
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__________________
RTF
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10-20-2017, 10:22 AM
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#24
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Guru
City: Columbia City, OR & Mulege, BCS
Vessel Name: Imagine
Vessel Model: Farrell 34
Join Date: Oct 2015
Posts: 690
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Quote:
Originally Posted by Islanddreamer
Also- where would you get lead pigs?
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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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10-20-2017, 12:47 PM
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#25
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Guru
City: St Augustine, FL
Vessel Name: RunningTide
Vessel Model: 37 Louisiane catamaran
Join Date: Jul 2013
Posts: 903
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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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10-20-2017, 01:00 PM
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#26
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Enigma
City: Slicker?
Join Date: Oct 2007
Posts: 15,424
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__________________
RTF
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10-20-2017, 02:04 PM
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#27
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Guru
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 2,730
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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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