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Boeing 80

 

boeing80


The growth of operations on Boeing Air Transport's San Francisco-Chicago route resulted in the design and development of a purpose-designed passenger transport, the Boeing Model 80, first flown during August 1928. A large unequal-span biplane, with the lower wing of reduced chord, the Model 80 had a wing structure of wood, fabric-covered, and a fuselage and tail unit of welded steel tube, also fabric-covered. Landing gear was of fixed tailwheel type, and power was provided by three 306kW Pratt & Whitney Wasp radial engines. These were mounted in tri-motor configuration, one in the fuselage nose, and one each side of the fuselage, between the biplane wings.


The main cabin of the Model 80 accommodated 12 passengers, plus a flight stewardess. Boeing stewardesses were all registered nurses. The Model 80 provided a separate enclosed flight deck for the pilot and co-pilot/navigator. Four of these aircraft were built, entering service with Boeing Air Transport in the late summer of 1928.

 

Boeing-80-2

 

The Model 80s were followed by 10 of the improved Model 80A, this type having more powerful Pratt & Whitney Hornet engines, refinements to the wing, improved streamlining and, because of the increased power available, a cabin layout to accommodate a maximum of 18 passengers.

Boeing 80
Engines: 3 x Pratt & Whitney Wasp, 306 kW
Passengers: 12

Boeing 80A-1
Engines: 3 x 391kW Pratt & Whitney Hornet radial piston
Take-off weight: 7938 kg / 17500 lb
Empty weight: 4800 kg / 10582 lb
Wingspan: 24.38 m / 79 ft 12 in
Length: 17.22 m / 56 ft 6 in
Height: 4.65 m / 15 ft 3 in
Wing area: 113.34 sq.m / 1219.98 sq ft
Max. speed: 222 km/h / 138 mph
Cruise speed: 201 km/h / 125 mph
Ceiling: 4265 m / 14000 ft
Range: 740 km / 460 miles
Passengers: 18

 

 


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