Boeing Model 247 / C-73

Specifications

1st Flight 1933

Crew: 3

Capacity: 10 passengers, baggage and 400 lb (181 kg) of mail

Length: 51 ft 7 in (15.72 m)

Wingspan: 74 ft 1 in (22.58 m)

Height: 12 ft 1.75 in (3.7021 m)

Wing area: 836.13 sq ft (77.679 m2)

Airfoil: Boeing 106B

Empty weight: 8,921 lb (4,046 kg)

Max takeoff weight: 13,650 lb (6,192 kg)

Fuel capacity: 273 US gal (227 imp gal; 1,030 l)

Powerplant: 2 × Pratt & Whitney R-1340 S1H1-G Wasp 9-cylinder air-cooled radial piston engines, 500 hp (370 kW) each at 2,200 rpm at 8,000 ft (2,438 m)

Propellers: 2-bladed variable-pitch propellers

Performance

Maximum speed: 200 mph (320 km/h, 170 kn)

Cruise speed: 189 mph (304 km/h, 164 kn) at 12,000 ft (3,658 m)

Range: 745 mi (1,199 km, 647 nmi)

Service ceiling: 25,400 ft (7,700 m)

Absolute ceiling: 27,200 ft (8,291 m)

Rate of climb: 1,150 ft/min (5.8 m/s)

Variants

Model 280-Original proposal of Boeing 247 with 14 seats and 700 hp P&W Hornet engines.

Model 247-Twin-engined civil transport airliner. Initial production version

247A-Powered by new 625 hp P&W Wasp, on special order for Deutsche Lufthansa in 1934.

247E-This designation was given to the first Boeing 247 aircraft, it was used to test a number improvements, that were later incorporated into the Boeing 247D

247D-Original one-off was a race aircraft designed for the MacRobertson Air Race; use of Hamilton Standard variable-pitch propellers allowed for a 7 mph (11 km/h) gain; the 247D configuration incorporated in production series bearing the same name.

247Y-Armed version, one exported to China, second used for trials.

C-73-Designation for Boeing 247D airliners “drafted” into military service in USAAF, 27 in total.

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