Initial Seakeeping Tests on an IACC Yacht Hull Model: Two Ballast Conditions

The Partnership for America's Cup Technology provided a 1:5 scale model of an International America's Cup Class yacht model and keel, which was tested at two drafts, both having the same radius of gyration and VCG. Test were made of upright resistance and model motions in smooth water and in regular waves. The model was free to surge, pitch, and heave while restraining all other degrees of freedom. Initial tests were made to compare the model in the free to surge mode (which is more realistic) and in the fixed in surge mode (which allows the determination of phase angles).