The Spruce Goose was conceived during World War II, when there was a growing need to move troops and materials across the Atlantic Ocean. Henry Kaiser imagined the idea of a massive flying transport and turned to Howard Hughes to design and build it. The Spruce Goose is six times larger than any aircraft of its time. Originally designated HK-1 for the first aircraft built by Hughes-Kaiser, it was re-designated the H-4 Hercules when Henry Kaiser withdrew from the project. It is made entirely of wood and flew one time on November 2, 1947, in Long Beach, California.
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This drawing is one of seven different concepts of the H-4 Hercules (Spruce Goose) that were drawn. This version of the Flying Boat depicts twin booms, and one fuselage.