Hullform Professional Versions - Hydrostatics

Hullform lets you calculate your design's displacement, its hydrostatics given displacement and heel, as well as many performance factors, such as metacentre position, prismatic coefficient and wetted surface area.

The program can evaluate a full set of hydrostatic parameters for any value of pitch or heel. An example of the program's three hydrostatics displays is below (both metric and British units are supported):

At a heel angle of                         0.000 deg
Pitch angle is                            -0.131 deg
Water density is                          64.063 lb per cu.ft
Sinkage is                                -0.012 ft
Volume displaced is                        7.495 cu ft
Assigned hull displacement is            480.000 lb
Total displacement is                    480.000 lb
Righting moment is                        31.048 lb ft per deg.
Mass per unit immersion                 2284.058 lb/ft
Moment to change trim (MCT)              142.182 lb ft per inch
Waterplane area                           35.654 sq ft
Wetted surface                            37.523 sq ft
Whole hull surface area                  100.049 sq ft
Whole hull surface LCG                     7.231 ft
Whole hull surface VCG                     0.479 ft
Overall length (Loa)                      14.000 ft
Waterline length (Lwl)                    14.000 ft
Maximum beam (Bmax)                        6.007 ft
Waterline beam (Bwl)                       3.685 ft
Draught (T)                                0.385 ft
Midsection freeboard (Fm)                  1.744 ft
Profile area above waterline              23.256 sq ft
Profile area below waterline               4.078 sq ft

You can also write the information on this screen to a disk file, cross plot any of 24 internal variables (e.g. righting lever against heel), and write tabular summaries to a disk file. Below are couple of sample hydrostatic cross plots.

Hullform also provides a flexible ability to produce a range of stability and hydrostatic tables. You can choose the stability variable from KN, GZ or righting moment, and the columns of your hydrostatic table from a list of over 50 internal parameters. The dialog box shown here illustrates the process of selection - you have control of both the entries used, and their location across your table.

If you want more, see the entry for Hullstat, which provides almost total control over any hydrostatic report format.