A slender body method, based on the work of Tuck et al (1999) and Couser et al (1996) is available in Hullspeed. This method uses a Michell (1898) based approach to compute the wave resistance of a port/starboard symmetrical monohull.

This method may be applied to many different hullforms including multihulls. However the individual hulls should be slender* and should be symmetrical about their local centreline. Planing forces are neglected in the slender body method which limits speed range applicability for this method. In general, sensible results can be obtained for a wide range of mono- and multihull vessels operating at normal Froude numbers.

This method predicts only the wave pattern resistance component. To calculate the total resistance, Hullspeed calculates and adds the viscous resistance component using the ITTC’57 friction coefficient calculation method and the specified form factor.

See Using the slender Body Method on page 22.

* = have narrow beam compared to their length.