), Howard Hughes' flying boat. He built a prototype and wanted to utilize it as a Trans-Atlantic transport plane during World War II. It was completed in time. However, on 2 November 1947, the plane made one brief flight
The plane was made from birch wood using the Duramold process. Wartime restrictions on aluminum, and concerns about the weight of the craft were cited for using wood. Critics gave it the name Spruce Goose, but mechanics allegedly gave it the nickname Birch Bitch.
The plane was designed to carry 68 000 kg, or 750 fully equiped soldiers, or two 30 ton M4 Sherman tanks.
The Hughes H-4 Hercules would be manned by a crew of 3, be almost 67 m long, and have a wingspan of 98 m. It's empty weight was almost 114 000 kg. Twenty-eight Pratt and Whitney R-4360 Wasp Major 28-cylinder air-cooled radial piston engines, 3000 hp each, would power the plane. The cruise speed would be 400 km/h, with a flight range of 4800 km. It would be able to fly at 6400 m.
The plane cost USD$23 million (almost USD$250 000 in 2023 dollars).
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