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To predict motions of SWATH ships in following seas, especially when the encounter frequency is small, unified slender-body theory has been applied. The longitudinal interaction term is computed and added to the results of the strip theory as a correction term. The added mass coefficients are computed to be much larger than those from strip theory, (Continued on reverse side) EDITION OF 1 NOV 65 IS OBSOLETE S/N 0102-LF-014-6601 UNCLASSIFIED SECURITY CLASSIFICATION OF THIS PAGE (When Dalm Bntmred) UNCLASSIFIED SECURITY CLASSIFICATION OF THIS PAGE (When Data Entered) (Block 20 continued) while damping coefficients are slightly less than two-dimensional results. There is improvement for heave motion for a limited range of frequencies, but the pitch motion is generally poor. To improve these results further, the two-dimensional potential should be solved by the multipole expansion method rather than by the Frank close-fit method.

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