A hydrofoil catamaran of 2000 displacement ton type is designed, keeping the load coefficient of the hydrofoil on the same level with that of a 200 ton type. The new system with four sets of hydrofoil shows satisfactory characteristics from the hydrodynamical viewpoints, namely, low resistance and low motion transfer functions. The experimental results suggest that the large-scale hydrofoil catamaran is one of the most feasible system for high-speed transportation. The motion control system by flaps is tested and the hydrodynamical forces in an oblique flow are studied.