Traditionally, boat designers rely on numerous expensive, time-consuming scaled-model tests to predict hydrodynamic forces acting on planing hulls. The authors completed roll decrement experiments using a torsion bar to force oscillation while measuring roll displacement, roll acceleration, and the forces/ moments in six degrees of freedom at varying forward velocities, yaw angles, and initial roll angles. Future analysis of roll (and roll coupled) hydrodynamic coefficients will be investigated by least square approximation using over-determinant matrix manipulation with comparisons to coefficient prediction methods developed by Brown and Klosinski as well as Lewandowski. Results can be used to compare current methods to theoretically determine the hydrodynamic roll damping, stiffness, added mass, and roll coupling terms.

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