General HydroStatics
Ship Stability Software
Command of the Week
(New or interesting aspects of GHS that you may not know about)


The WEIGHT command is provided for establishing the bulk of light-ship weight (and its center of gravity). Then after the WEIGHT command, additional "fixed-weight" items may be specified by means of the ADD command. (They're known as "fixed" weights in contrast to weights of tank loads.)

To add optional elements to the light-ship weight from identified items, the ADD + command can be used (descriptions begin with "+"). These items get lumped together under the LIGHT SHIP+ heading in the STATUS report (see STATUS documentation for several variations).

The main light-ship weight should always be given directly by the WEIGHT command or indirectly by SOLVE WEIGHT.

The WEIGHT command can be quite complex. Segments within it (separated by ";") can represent various elements of the light ship. Segments can either be point weights or weight density distributions. Here is a simple example:

WEIGHT 1.0 @ -40, 1.0 @ 40, 0, 7.0; `Hull shell
0.2 @ -45, 0.2 @ 45, 0, 14.0; `Deck
10.0, 20f, 0, 5.5 `Engine

We can hear John Bonn saying "It would be nice if you guys provided some tools for specifying distributed light ship so I won't be tempted to use ADD + for everything."

Well, we're working on it. In fact, it's our resolution to get that as well as a bunch of other powerful tools out in 2020, but don't mention it outside the barn because it's supposed to be a surprise.

Happy Moo Year!

Questions, comments, or requests?
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Port Townsend, WA 98368 USA

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