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Despite its nickname, Howard Hughes' "Spruce Goose" was built mainly out of what wood? Explained. Howard Hughes's renowned cargo aircraft, commonly known as the "Spruce Goose," was predominantly constructed from birch wood rather than spruce, despite its name. Formally designated as the Hughes H-4 Hercules, this colossal plane was conceptualized as a response to the need for troop and material transportation during World War II, a time when metals like aluminum were scarce due to wartime requirements. In a bid to address this scarcity, Hughes and his team turned to wood as a substitute. Although spruce was contemplated at first, birch was chosen for its robustness and abundance during the wartime period.