Turboprop-powered amphibious aircraft built largely of composite materials. Developed by Claudius Dornier Jr of Germany, it first flew in 1984. Wikipedia.
Twin–radial engined amphibious seaplane that was used by the USAF, USN, U.S. Coast Guard (USCG), and the Royal Canadian Air Force primarily as a search and rescue (SAR) aircraft.
Hughes H-4 Hercules (Spruce Goose) is a prototype strategic airlift flying boat. Intended as a transatlantic flight transport for use during World War II. Made only one brief flight on November 2, 1947. - Wikipedia
The largest flying boat ever built up to its time. The type was not a success, being unreliable and uneconomic to operate. Five of the eleven aircraft built were written off in accidents and one was lost during World War II. Wikipedia