The Sea Fighter is an aluminum catamaran designed to operate effectively in littoral, or coastal, waters. It can maneuver in as little as 11 feet (3.35 m) of water. The hull number FSF-1 stands for “fast sea frame” and is the first U.S. Naval vessel to have a catamaran design. The experimental vessel will be used to test the hydrodynamic performance, structural performance, structural behavior, mission flexibility and propulsion-system efficiency of high-speed vessels.