The SSPA Cargo Liner Series. Hull surface generation and geometry of forms

An overall analysis of the resistance and propulsion results of the SSPA Cargo Liner Series has been presented in Reports No. 66 and 67, which provided designers with diagrams for preliminary prediction of speed and power of forms designed according to the SSPA Cargo Liner Series. However, the corresponding hull offsets together with the geometric particulars has hithetro not been defined in the same fashion.

This paper presents diagrams and simple formulae from which the hull offsets together with the main geometric particulars of any intermediate form within the range of the Series can be determined. The hull offsets adequately define both below and above-water forms up to depth/draught ratio of 1.80. The hull offsets so generated would be fair as regards normal design office scale drawing, and can be used in other preliminary design calculations such as hydrostatics, capacities, cross-curves of stability, floodable length, ……etc. Mathematical expressions were developed to represent the diagrams for the hull surface generation and they were used together with the formulae for the calculation of the main geometric particulars to form a computer program for the generation of the hull surface and calculation of the main geometric particulars of any intermediate form.