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Date Posted: 12:13:30 10/20/99 Wed
Author: Duane Fowler
Subject: Gross Tonnage does not equal Displacement
In reply to: Attila Roman 's message, "Re: Weight of ship fully loaded? Sorry this is tuff!" on 12:05:35 10/17/99 Sun

One thing to always remember when looking at weight is that Net tonnage, Gross Tonnage, and displacement are not the same things. Net tonnage and Gross tonnage are NOT measurements of WEIGHT. They are measurements of VOLUME. Displacement is a measure of actual weight. Take the case of the Titanic and the Olympic. Although they were vertually the same displacement, the Titanic had a greatter Gross Tonnage due to its configuration with more staterooms. The Olympic increased her Gross Tonnage over the years although her displacement didn't increase very much.

Displacement, which is always listed for military ships but almost never listed for commercial ships, is literally the weight of the water displaced by the ship which is equal to the weight of the ship.

In the case of the Britannic, removing decor or fittings or davits, no matter how weighty, would not have affected the Gross Tonnage at all, although the displacement would be affected. However, if the displacement were dramatically changed, they would have ballasted the ship in other ways so that the handling would not be adversely affected.

Regards,

Duane Fowler

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