Figures 2 to 4 give the results for model 4b; Figures 5 to 7 those for model 5b and Figures 8 to 10 those for the most slender model, 6b.

For the slowest Froude number (F_n = 0.20), Figures 2, 5 and 8, the Seakeeper results show good correlation with the monohull model tests, for all the Length:Displacement ratios. The interaction between the demihulls, which may be observed as a secondary resonant peak is not computed since the Seakeeper model is for a single demihull in isolation. However, these secondary resonant peaks diminish rapidly with increasing Length:Displacement ratio (going from model 4b to 6b); and excellent correlation is found for model 6b for both catamaran configurations.