USE_MAC V_MODEL

The body will be named "TANKER" unless a second argument is given to the macro. In this case, the second argument will be the name. The form of the command is:

 
   tkr_model isize name        \
            -extra extra    \
            -detail det
 

In addition to defining the hull geometry, the lightship weight, the wind and current force attributes, it sets several variables which may be useful later. In particular:

 
           VLENGTH  = Vessel length,
           VBEAM    = Vessel beam,
           VDEPTH   = Vessel depth,
           L_DRAFT  = Light Draft, and
           H_DRAFT  = Summer Draft.
 

The wind and current load attributes are defined by a #TANKER load group attribute so that OCIMF formulae will be used for wind and current force computation.

The macro has one option -EXTRA which can be used to define additional load attributes. After the -EXTRA, one puts sets of eight pieces of data:

 
        enam = The name of the extra piece,
        wt   = The weight of the piece,
        x    = The x coordinate of the center aft of the bow,
        y    = The y coordinate of the center stbd of the centerline,
        z    = The z coordinate of the center above the deck,
        len  = The "length" of the piece,
        wth  = The "width" of the piece, and
        hgt  = The "height" of the piece.
 

These numbers define a rectangular box which will add a weight to the lightship, and areas for wind force. Here, length is a distance along the vessel's x-axis, width is a length along the y-axis, and height is a length along the z-axis.

All inputs to this macro are in the "current units", and all variables will be set in "current units". Lengths are in either feet or meters, and forces are in the current "big force" unit.