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Boeing XPB
The Boeing XPB (company Model 50) was an American twin-engined biplane long-range patrol flying boat of the 1920s. A single example was built for the United States Navy. ==Design and development==
In September 1924, the Naval Aircraft Factory was tasked with designing a long-range twin-engined flying boat, capable of flying the 2,400 mi (3,860 km) between San Francisco and Hawaii. The initial design was carried out by Isaac Laddon, an employee of Consolidated Aircraft, and then passed to Boeing for detailed design and construction. The new flying boat, the Boeing Model 50, was a two-bay biplane of very streamlined design for flying boats of the time. The wings were of metal construction, with wooden wingtips and leading edges. The fuselage had a metal lower part, with the upper half made of laminated wooden frames with a wood veneer covering. Two 800 hp (600 kW) Packard 2A-2500 V12 engines driving four-bladed propellers were mounted in tandem between the wings above the fuselage.〔
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