Boeing 307 Stratoliner

  • boeing 307 stratoliner
    c-75
    boeing 307 udvar hazy.jpg
    a restored (ex-pan am) boeing 307 on display at the steven f. udvar-hazy center
    role airliner
    manufacturer boeing
    first flight december 31, 1938
    introduction july 4, 1940 with pan american airways[citation needed]
    retired 1975
    status retired
    primary users twa
    pan american airways
    united states army air forces
    number built 10
    unit cost
    $315,000 in 1937[1] (equivalent to $5.6 million today)
    developed from boeing b-17 flying fortress

    the boeing model 307 stratoliner was a commercial transport aircraft that entered service in 1938. it was the first to offer a pressurized cabin, allowing it to cruise at an altitude of 20,000 ft (6,000 m), well above many weather disturbances. the pressure differential was 2.5 psi (17 kpa), so at 14,700 ft (4,480 m) the cabin air pressure was equivalent to an altitude of 8,000 ft (2,440 m). the model 307 had capacity for a crew of six and 33 passengers. the cabin was nearly 12 ft (3.6 m) across. it was the first land-based aircraft to include a flight engineer as a crew member (several flying boats had included a flight engineer position earlier).[1] in addition to its civilian service it was also flown as the boeing c-75 stratoliner by the united states army air forces, who used it as a long-range cargolift aircraft.

  • development and design
  • operational history
  • variants
  • operators
  • accidents and incidents
  • surviving aircraft
  • specifications (boeing 307)
  • see also
  • references
  • notes
  • bibliography
  • external links

Boeing 307 Stratoliner
C-75
Boeing 307 Udvar Hazy.jpg
A restored (ex-Pan Am) Boeing 307 on display at the Steven F. Udvar-Hazy Center
Role Airliner
Manufacturer Boeing
First flight December 31, 1938
Introduction July 4, 1940 with Pan American Airways[citation needed]
Retired 1975
Status Retired
Primary users TWA
Pan American Airways
United States Army Air Forces
Number built 10
Unit cost
$315,000 in 1937[1] (equivalent to $5.6 million today)
Developed from Boeing B-17 Flying Fortress

The Boeing Model 307 Stratoliner was a commercial transport aircraft that entered service in 1938. It was the first to offer a pressurized cabin, allowing it to cruise at an altitude of 20,000 ft (6,000 m), well above many weather disturbances. The pressure differential was 2.5 psi (17 kPa), so at 14,700 ft (4,480 m) the cabin air pressure was equivalent to an altitude of 8,000 ft (2,440 m). The Model 307 had capacity for a crew of six and 33 passengers. The cabin was nearly 12 ft (3.6 m) across. It was the first land-based aircraft to include a flight engineer as a crew member (several flying boats had included a flight engineer position earlier).[1] In addition to its civilian service it was also flown as the Boeing C-75 Stratoliner by the United States Army Air Forces, who used it as a long-range cargolift aircraft.

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