Boeing Commercial Airplanes
Boeing 307 Stratoliner

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General Info

Boeing Commercial Boeing 307 Stratoliner 

Role	Airliner
National origin	United States
Manufacturer	Boeing
First flight	December 31, 1938[
Introduction	July 4, 1940 with Pan American Airways
Status	Retired
Primary users	Transcontinental & Western Air Aigle Azur United States Army Air Forces Pan American Airways
Number built	10
Developed from	Boeing B-17 Flying Fortress

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History Boeing Commercial Airplanes
Boeing 307 Stratoliner "Clipper Flying Cloud"

The Boeing Model 307 Stratoliner (or Strato-Clipper in Pan American service, or C-75 in USAAF service) is an American stressed-skin four-engine low-wing tailwheel monoplane airliner derived from the B-17 Flying Fortress bomber, which entered commercial service in July 1940. It was the first airliner in revenue service with a pressurized cabin, which with supercharged engines, allowed it to cruise above the weather. As such it represented a major advance over contemporaries, with a cruising speed of 220 mph (350 km/h) at 20,000 ft (6,100 m) compared to the Douglas DC-3s 160 mph (260 km/h), at 8,000 ft (2,400 m) then in service

Development

In 1935, Pan American Airways, United Airlines, American Airlines, Eastern Air Lines and Transcontinental & Western Air (T&WA) had each signed a contract with Douglas to develop the 40 passenger DC-4 (later known as the DC-4E). Each company contributed $100,000 to development costs and agreed to not operate other aircraft with a maximum weight of 43,000 to 75,000 lb (20,000 to 34,000 kg) for revenue service. Due to development problems and poor performance, all of the airlines dropped out of the DC-4 program and cancelled their orders, but a requirement for a large 4 engine airliner remained.

Design

As built, the Stratoliner used the all-metal stressed-skin cantilever wings from the B-17C mounted low on the fuselage to a constant chord center section faired to the fuselage, with four 1,100 hp (820 kW) Wright GR-1820 Cyclone air-cooled radial engines . TWA examples used GR-1820-G105A engines fitted with two stage superchargers for high altitude performance, while the Pan Am examples used the GR-1820-G102 with a single stage supercharger Wiki Link

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Boeing Commercial Airplanes
Boeing 307 Stratoliner  "Clipper Flying Cloud"

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Boeing Commercial Airplanes
Boeing 307 Stratoliner "Clipper Flying Cloud"

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General characteristics

• • Crew: Five, including pilot, co-pilot, flight engineer and 2 flight attendants
  • Capacity: Daytime seating for 33, nighttime capacity 25, in 16 berths and 9 reclining chairs
  • Length: 74 ft 4 in (22.66 m)
  • Wingspan: 107 ft 3 in (32.69 m) 
  • Wing chord: 19 ft 0 in (5.79 m) at root and 9 ft 4.5 in (2.858 m) at tip rib^[Height: 20 ft 9 in (6.32 m) at rudder
  • Undercarriage track: 295 in (7.5 m)
  • Wing area: 1,486 sq ft (138.1 m²)

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Powerplant

• • Powerplant: 4 × Wright GR-1820-G105A Cyclone air-cooled radial engines with two-stage superchargers, 1,100 hp (820 kW) each at 2400 rpm for sea level takeoff, reduced to 900 hp (670 kW) at 2300 rpm at 17,300 ft (5,300 m)
  • Propellers: 3-bladed Hamilton Standard all-metal Hydromatic constant-speed propellers, 11 ft 6 in (3.51 m) diameter

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Specifications

• • Maximum speed: 250 mph (400 km/h, 220 kn) at 16,200 ft (4,900 m)
  • Cruise speed: 222 mph (357 km/h, 193 kn) at 19,000 ft (5,800 m) and 75% power
  • Minimum control speed: 70 mph (110 km/h, 61 kn) with flaps
  • Takeoff run: 1,800 ft (550 m)
  • Landing run: 2,050 ft (620 m)
  • Range: 1,300 mi (2,100 km, 1,100 nmi) at 19,000 ft (5,800 m) & 75% power
  • Service ceiling: 23,800 ft (7,300 m) , reduced to 18,000 ft (5,500 m) when on three engines
  • Cruising altitude: 15,000–20,000 ft (4,600–6,100 m)

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Armament

• • de Havilland Albatross
  • Bloch MB.160
  • Douglas DC-4E
  • Fairey FC1 (project only)
  • Focke-Wulf Fw 200 Condor
  • Junkers Ju 90

Special Links Boeing Commercial Airplanes Boeing 307 Stratoliner 

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The Boeing 307 Stratoliner comes with four liveries: Boeing Delivery, Emerald Harbor, WorldTravel, and AREA (Colombian). Climb aboard, power up the systems, crank the engines, then set off into the heights in this classic

Boeing  Airplanes Boeing 307 Stratoliner

Experience the legendary Model 307 that set the standard for airliner technology, comfort, and class.

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Experience the legendary Model 307 that set the standard for airliner technology, comfort, and class.

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