The legendary Hercules flying boat was designed and built by the Hughes Aircraft Company. Intended to defeat the German U-boat threat, the plane was intended to be a super transport that could ferry 750 troops from the USA to Europe, and serve as an aerial ambulance on the return flight. Owing to wartime restrictions on the use of aluminum, the prototype Hercules was built using laminated birch wood. Although company CEO Howard Hughes hated it, the name "Spruce Goose" was coined for the plane and it stuck. The HK-1 (later designated H-4) would be the largest flying boat ever built, and one of...