"Thom Stewart" wrote in message
...
OK Edgar,

I'll ask the question. On internal ballast; are you talking about the
weight of the ballast itself or are you talking about the weight of the
water that the "Internal Ballast" caused to be DISPLACED.

They are the same. Add a ton of ballast and you displace a ton of water as
the boat sinks down to a new draft

Also; What are you referring to when you say " Displacement 'tonnage"
What are you weighing? Ballast or displaced water?

Following from my answer above I am talking about the weight of displaced
water which is equally the weight of the boat. I could have left out the
word 'tonnage' which seems to cause confusion.

Displacement Tunnage
(correct spelling) is a Volume measurement.

As to the spelling, well, I am an Englishman despite living now in Norway
and that is how we spell 'tonnage'. In English a 'tun' is a large wine cask
or vat holding 252 (English!) gallons. Not often seen outside the winery
itself