The largest wooden airplane ever constructed, and WAS flown only one time. The Spruce Goose was born out of a need to move troops and material across the Atlantic Ocean, where in 1942, German submarines were sinking hundreds of Allied ships. Henry Kaiser, steel magnate and shipbuilder, conceived the idea of a massive flying transport and turned to Howard Hughes to design and build it. Six times larger than any aircraft of its time, the Spruce Goose, also known as the Hughes Flying Boat, is made entirely of wood. rochestermilitary.com