Boeing 307 Stratoliner

Boeing 307 Stratoliner
Land	Usa
Rolle	Passagerfly
Første flyvning	31. december 1938
Bygget	10

Den Boeing Model 307 Stratoliner var det første kommercielle transportfly, der blev taget i brug med en trykkabine. Denne funktion gjorde det muligt for flyet at sejle i en højde af 20.000 fod (6.000 m), langt over mange vejrforstyrrelser. Trykforskellen var 2,5 psi (17 kPa), så ved 14.700 ft (4.480 m) svarede kabinens lufttryk til en højde på 8.000 ft (2.440 m). Model 307 havde plads til en besætning på seks og 33 passagerer. Ud over sin civile tjeneste blev den også fløjet som Boeing C-75 Stratoliner af United States Army Air Forces, som brugte den som et langtrækkende cargoliftfly.

Kilde: Boeing 307 Stratoliner på Wikipedia

Boeing Model 307 Stratoliner Walk Around
Fotograf	Vladimir Yakubov
Lokalisering	Det Nationale Luft- og Rummuseum
Billeder	107

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Boeing Model 307 Stratoliner Walk Around
Fotograf	Michael Benolkin
Lokalisering	Unknow
Billeder	27

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A Revolution in Civil Aviation

Den Boeing Model 307 Stratoliner was a milestone in aviation history. Introduced in 1938, it was the first commercial transport aircraft to feature a pressurized cabin. This allowed the Stratoliner to fly at 20,000 feet, far above the turbulent weather that plagued earlier airliners like the DC-3. By utilizing the wings, tail, and engines of the B-17 Flying Fortress, Boeing created a robust, high-altitude cruiser that changed the definition of luxury and speed in the “Golden Age” of flight.

Attribute	Technical Specification (Boeing 307)
Rolle	Long-Range Commercial Airliner / Military Transport
Besætning	5 (Pilot, Co-pilot, Flight Engineer, 2 Flight Attendants)
First Flight	31. december 1938
Kraftværk	4 × Wright GR-1820-G102 Cyclone radials
Horsepower	1,100 hp (820 kW) per engine
Maximum Speed	241 mph (388 km/h)
Cruising Altitude	20,000 feet (6,100 m)
Passenger Capacity	33 (Day) / 25 (Night Sleeper)

Engineering the High-Altitude Cabin

Circular Fuselage: Unlike the flat-sided aircraft of the era, the 307 featured a perfectly circular cross-section. This shape was necessary to evenly distribute the internal pressure stresses required to maintain a breathable atmosphere at high altitudes.
Pressurization System: The Stratoliner used engine-driven superchargers to pump air into the cabin. This allowed passengers to enjoy an “8,000-foot” environment while the aircraft cruised at 20,000 feet, effectively avoiding the “bumps” of low-level air.
B-17 DNA: To save on development costs and improve reliability, Boeing used the flight surfaces of the B-17C Flying Fortress. The wings, landing gear, and horizontal stabilizers were nearly identical to the bomber, giving the 307 legendary structural strength.
Sleeper Comfort: The wide fuselage allowed for reclining seats and berths, making it one of the first true “sleeper” transports for transcontinental travel.

The “C-75” and Notable History

Military Service (C-75): During WWII, the five Stratoliners operated by TWA were pressed into service for the Army Air Transport Command. Designated as C-75s, they were used for high-priority transatlantic flights because their pressurization allowed them to fly above most interception threats.
Howard Hughes and the “Flying Penthouse”: The famous billionaire bought a Stratoliner and converted it into a lavish private office and home. After being damaged in a hurricane, the fuselage was eventually converted into a “Cosmic Muffin” house boat.
Rare Survival: Only 10 Stratoliners were ever built. The only surviving example, the “Flying Cloud” (formerly of Pan Am), was meticulously restored by Boeing volunteers and is now at the Steven F. Udvar-Hazy Center.