Boeing 247
The Boeing Model 247 was a good airplane but, its capacity proved too
small and its passengers found it awkward to step over the main spar in
the aisle.
The
year 1933 was extremely important in the history of air transport for it
was then that the two original ancestors of the modern airliner appeared.
One was the Douglas DC-1, which first flew in July, and the other was the
Boeing Model 247, which first flew as a prototype on February 8,1933.
Although later developments of the Douglas aircraft were to become the
most widely used of the early modern airliners, it was the Boeing 247 that
pioneered the whole new generation of transports. It was a good airplane,
and bought by United Airlines and other U.S. carriers, but its capacity
proved too small and its passengers found it awkward to step over the main
spar in the aisle. Around seventy-five Model 247s were built for customers
in the US and abroad, including Lufthansa of Germany a creditable total
for any aircraft of the thirties.
Early route flying after
the First World War convinced airline operators that multi-engined
aircraft were preferable for flying long distances and across water, in
terms of both economy and safety. However, while huge lumbering biplanes
were still the vogue, the Boeing company designed the Model 247 as a new
ten-passenger aircraft of revolutionary concept. The all-metal airframe
was well streamlined, with low monoplane wings, a smooth oval
semi-monocoque fuselage, neatly cowled twin engines, and an enclosed
cockpit for the pilots. The undercarriage was retractable, giving the
aircraft a maximum speed of over 290 km/h (180 mph). This was far higher
than the speed of contemporary biplane airliners, rivalling the
performance of military fighters of the day.
The 247 was an immediate
success and the first production aircraft were quickly followed by the
refined Model 247D. But destiny still held further success for the
airliner. Many great aircraft built between the wars were evolved to take
part in air races; such contests were also excellent proving grounds for
new or established production types. So, when the MacRobertson Race from
England to Australia was organized in 1934, a Boeing Model 247D was
entered. Flown by Col. Roscoe Turner and Clyde Pangbourne, it gained
second place in the transport section, behind its great rival the DC-2.
Specifications:
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Boeing Model 247
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Dimensions:
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Wing span:
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74 ft (22.6 m)
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Length: |
51 ft 7 in (15.7 m)
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Height: |
12 ft 6 in (3.8 m)
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Wing Area:
|
836.44 sq ft (77.70 sq
m) |
Weights: |
Empty: |
8,940 lb (4,055 kg)
|
Gross T/O:
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13,650 lb (6,192 kg)
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Performance:
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Maximum Speed:
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200 mph (322 km/h)
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Service Ceiling:
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25,400 ft (7,740 m)
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Rate of Climb:
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1,150 ft (350m)/min
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Normal Range:
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800 miles (1,297 km)
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Powerplant:
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Two Pratt & Whitney
Wasp S1H1-G, 550 hp, 9-cylinder radial engines. |
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