Hull and strake geometries on a craft typically influence effective rudder angle during turning maneuvers. In this paper, we propose a simple yet accurate model for effective rudder angle that can be used in lumped-parameter maneuvering simulations. The model defines the effective angle as a function of the local inflow angle through a linear coefficient. Time-accurate simulations, based on Reynolds Averaged Navier Stokes Equations (RANSE) solver, were used to derive model parameters. It is shown that the model improves turning-maneuver simulation output accuracy without the need to alter any other hydrodynamic coefficients within the simulation.

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