Statistical data of hull main parametersuseful for preliminary design of SWATH ships

The paper presents investigations of statistical relations between main design parameters of the SWATH ship hull shapes, carried out on bibliographical data of more than eighty ships. The statistical relations are presented in the form of histograms of: ship length L, length to breadth ratio L/B, length to depth ratio L/H, length to pontoon diameter ratio L/D. Also approximated expressions are presented of the relations between the ship length and vertical clearance Gap and between draught T and pontoon diameter D. The presented statistical expressions, supplemented with assumptions about relations between main dimensions and derived dimensions, may be used for determination of the fast SWATH ship main design parameters at the preliminary design stage or may be a basis for rational selection of the range of variation of main dimensions in a SWATH ship hull shape series.