To specify which methods to use, choose Methods from the Data menu, or alternatively use the - toolbar button. A dialog box will appear which allows you to select the resistance prediction methods that you wish to use.

As outlined on page 6, different methods are useful for analysing different hull types. Since a planing hull is to be analysed, select the methods pertinent to such a design.

Once a method has been selected, a column will appear in the Data window, with spaces to enter the data relevant to that method. In general the methods do not use all the data; only the data relevant to the analysis method is copied into that column. Unused data will contain ‘- -’.

Two additional columns will appear in the Results window for each resistance prediction method selected; one for the predicted resistance and one for the power required.

For the Slender Body method, a user-specified form factor has to be specified. To use the Holtrop and Mennen form factor, give a negative value (e.g. –1.0). The form factor is only applied to the slender body method resistance prediction. This method is explained in detail in the Using the slender Body Method section starting at page 22.

Also see

Prediction methods on page 6 for more information on the different methods available in Hullspeed.

Appendix B Applicability on page 57 to investigate which method is appropriate for a particular type of vessel.