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Date Posted: 22:00:21 11/09/16 Wed
Author: Albert Parker
Subject: Re: Vasco da Gama, 1841
In reply to: Cy 's message, "Re: Vasco da Gama, 1841" on 05:10:50 11/09/16 Wed

>Hi AvM
>Can you expend on the dimensions you have given, why
>two sets? and what they relate to. A keel length of
>201'8" (61.48 M) seems way too long?
>I assume Tonnage is a displacement value not a tons BM.
1,829 tons, even metric tonnes, is much too small a displacement for a ship with a 60-meter+ keel. That's the displacement of a British or French 60-gun two-decker of the early 18th century (or mid-18th century, i.e., 1750s, in the British case). French three-deckers of the early 19th century had gun decks of 200 feet and displaced around 5,000 tonnes. (The British long ton, the French tonneau, and the metric tonne are all about the same, the tonneau being 978.78 kg and the British ton being 1,016.06 kg). I have no idea what the Portuguese burthen formula was.

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