FS2002/FS2004 Martin SP-5B Marlin. This was a twin engined piston powered flying boat entering service in 1951 and serving into late 1960s in service with the United States Navy for naval patrol. It also served in the U.S. Coast Guard and with the French Navy. 285 were produced overall. The Marlin was designed as a gull-winged aircraft to lift the engines and propellers high above the spray. By Kazunori Ito.