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Boeing PB / XPB / 50
Boeing PB-1
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.
The Boeing Model 50, designated PB-1 by the US Navy, made its maiden flight in August 1925 as A6881. It was intended to use it to lead a pair of Naval Aircraft Factory PN-9s in an attempt to fly to Hawaii on 31 August 1925, but engine trouble led to its participation in the flight being cancelled.
In 1928, the aircraft was modified by the Naval Aircraft Factory, its Packard engines were replaced by two 500 hp (370 kW) geared Pratt & Whitney R-1690 Hornet radial engines, leading to the new designation PB-2.
Although the aircraft was a prototype the U. S. Navy did not distinguish between experimental and operational aircraft at that time so the aircraft was never designated XPB-1 or XPB-2.


Engines: 2 × Packard 2A-2500, 800 hp (600 kW) each
Length: 59 ft 4.5 in (18.098 m)
Wingspan: 87 ft 6 in (26.67 m)
Wing area: 1,801 sq ft (167.3 m2)
Airfoil: Clark Y
Height: 20 ft 10 in (6.35 m)
Empty weight: 11,551 lb (5,239 kg)
Gross weight: 26,882 lb (12,193 kg)
Maximum speed: 97 kn; 180 km/h (112 mph)
Cruise speed: 82 kn; 151 km/h (94 mph)
Service ceiling: 9,000 ft (2,700 m)
Range: 2,172 nmi; 4,023 km (2,500 mi)
Rate of climb: 4,000 ft/min (20 m/s)
Armament: none fitted
Crew: 5



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