This report considers the analytically predicted interference effects in a methodical series of 378 trimarans based on Series 64 hull forms. Wave interaction effects on drag were evaluated statistically to obtain a series of algebraic expressions for interference prediction based on form-related parameters and known resistance characteristics of the component monohulls. This technique could be used in early-stage design to predict the calm water resistance of an arbitrary set of component hulls in a trimaran configuration based on their known individual monohull resistance characteristics.

Five variables: side hull length, longitudinal position, transverse position, and the displacement to length ratio of the center and side component hulls (expressed in English units as D/(.01L)3), each having between two and seven values were used to define a family of 378 trimarans based on Series 64 parent hulls. Resistance for each configuration was calculated using the Total Ship Drag program developed at Naval Surface Warfare Center Carderock.

Interaction effects wer examined both qualitatively and through a multiple linear regression statistical treatment. The results of the regression were used to develop a method for predicting the calm water resistance of a trimaran composed of arbitrarily chose component hulls with known resistance characteristics.

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