Freeboard Data

This dialog uses 3 tab sheets for inputting data. By default, on opening, the General sheet is selected, the other available sheets in the dialog are Superstructures and Freeboard Deck.

Much of the information that is input into these tab sheets will need to be extracted, by you, from the vessel's general arrangement drawings, , even though some of the data is implicit within the hull geometry input file.

General

you should enter a Title for the freeboard calculation run, select the Load Line Protocol and a freeboard type from the Protocol and Tabular Freeboard drop-down lists. The Freeboard Length is entered in meters or feet.

The Deck line (units: mm or inches) is the difference between the height to the upper edge of the deck line and the least moulded (freeboard) depth +ve if to be added or -ve if to be subtracted from the freeboard.

The program will use the block coefficient at a draft corresponding to 85% of least moulded depth. If the boxes next to the Block Coefficient, Waterplane area coefficient forward and Tonnes per cm (or Tons per inch) immersion edit boxes, are checked, then the program will calculate these values from the geometry definition. Otherwise the entered values are used.

Superstructure

A superstructure correction is applied to the freeboard obtained from the standard tables. Superstructure will also have an influence on the correction for sheer, and, in the case of the forecastle, on the checks for bow height and reserve buoyancy forward.

A superstructure unit is added or deleted using the Appropriate buttons under the superstructure data entry grid. Clicking the Edit Bulkheads button will display a dialog for editing the superstructure end bulkheads and other data. This allows you to specify insets or recesses,

The bulkhead type is selected from the drop down box in the grid. If Undefined is selected, the program will attempt to determine the type from the position of the end bulkheads. However, the program cannot recognize, for example, whether it a raised quarterdeck or trunk, so these types must be specified explicitly by you.

The height and breadth are the mean values. If there are different values for the different ends, then these must be given on the Edit Bulkheads dialog.

Freeboard Deck

The deck sheer and offset is determined from the coordinates entered in this table. you must enter these, as they cannot be obtained from the geometry definition.