An intensive tank tests program was carried out during 3 sessions conducted at the A.N.A.S.T. facility with 1/5th scale single hull models towed at speeds covering a range of Froude numbers from low subcritical 0.225 to medium supercritical 1.3. The model was free to pitch and heave, but yaw and roll were locked in with constant drift and heel. This program aimed primarily at studying the effects of including longitudinal asymmetry and semi-planing shapes inside an innovative approach for hull design of catamaran sailboat. Key parameters as slenderness ratio (LWL/BWL), bow half-entry angles, keel line relative camber, deflecting chine widths have driven the evolution of hydrodynamic design for 4 different hull shapes which finally led to a final candidate, fitted on the TECHNI 28 Leman's lake M2 day racer.
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