Does the volume matter? Can the weight be offset? You can scale the geometry and accommodate dynamic and kinematic similarity by matching Froude, Reynolds, Dra

Does the volume matter? Can the weight be offset? You can scale the geometry and accommodate dynamic and kinematic similarity by matching Froude, Reynolds, Drag and Pressure coefficients - or what non-dimensional parameters you have based on the identified variables (http://en.wikipedia.org/wiki/Buckingham_%CF%80_theorem http://en.wikipedia.org/wiki/Buckingham_%CF%80_theorem) I would expect that the surface tension would have negligible impact on the physics of the boat in open ocean, maybe unless you are interested on the behaviour of the spray across the decks.