Boeing XPB

The Boeing Model 50(XPB) was an American twin engine long-range patrol flying boat of the 1920s.

A single example was built for the United States Navy.

The Boeing Model 50, designated XPB-1 by the US Navy, made its maiden flight in August 1925.

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 XPB-2.

Specifications

Crew

5

Length

59 ft 4.5 in (18.098 m)

Wingspan

87 ft 6 in (26.67 m)

Height

20 ft 10 in (6.35 m)

Wing area

1,801 sq ft (167.3 m2)

Airfoil

Clark Y

Empty weight

11,551 lb (5,239 kg)

Gross weight

26,882 lb (12,193 kg)

Powerplant

2 × Packard 2A-2500 liquid-cooled V12 engine,

800 hp (600 kW) each

Performance

Maximum speed

97 kn (112 mph, 180 km/h)

Cruise speed

82 kn (94 mph, 151 km/h)

Range

2,200 nmi (2,500 mi, 4,000 km)

Service ceiling

9,000 ft (2,700 m)

Rate of climb

4,000 ft/min (20 m/s)

Armament

Guns

3 × .30 in machine guns

Bombs

4,000 lb (1,800 kg).