Abstract
A model of a surface-piercing wing has been towed through the water at three speeds in two opposite directions for different draughts and drift angles. The experiments were carried out in both deep and shallow water. Purpose of the tests was to measure the longitudinal and transverse forces on the wing-model. From the measured forces hydrostatic manoeuvring coefficients were determined as a function of the drift angle. In addition to these static measurements forced horizontal motion tests with a Planar Motion Mechanism (PMM) were carried out to determine the hydrodynamic manoeuvring coefficients. Calculations based on the potential theory and on the variation of the added mass impulse were carried out to determine the manoeuvring coefficients for small drift angles. Comparison with the measurements showed encouraging results to determine manoeuvring coefficients also for the velocity derivatives. Both experiments and calculations showed a strong increase of the coefficients with draught and reduction of waterdepth.
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