Boeing 707
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| Boeing 707-320 | ||
|---|---|---|
| ||
| Description (data for -320B) | ||
| Role | Airliner | |
| Crew | 3 | |
| First Flight | @ | |
| Entered Service | @ | |
| Number built | 1,010 (excluding military models) | |
| Manufacturer | Boeing | |
| 707-320 | ||
| Dimensions | ||
| Length | @ m | @ ft @ in |
| Wingspan | @ m | @ ft @ in |
| Height | m | @ ft @ in |
| Wing area | @ m² | @ ft² |
| Weights | ||
| Empty Weight (OWE) | @ kg | @ lb |
| Maximum takeoff weight | @ kg | @ lb |
| Capacity | Max @ pax in two class cabin lay-out | |
| Powerplant | ||
| Engines | four Pratt & Whitney JT3D-3 turbofans | |
| Thrust | 80 kN (each) | @ lbf (each) |
| Performance | ||
| Max cruise speed | @ km/h | Mach @ |
| Cruise speed | @ km/h | Mach @ |
| Range (@ MTGOW) | @ km | @ nm |
| Service ceiling | @ m | @ ft |
Contents |
History
America entered the age of the jet transport on July 15, 1954, when the Boeing 707 prototype, the model 367-80, made its maiden flight from Renton Field, south of Seattle. Production go-ahead for the Dash 80 was announced by Boeing Aug. 30, 1952, as a company-financed $16 million investment. The airplane rolled from the factory less than two years later, on May 14, 1954. Its first flight that July marked the 38th anniversary of The Boeing Company. Powered then by four Pratt & Whitney JT3 turbojets, mounted under wings swept back 35 degrees, the Dash 80 established the classic configuration for jetliners to come. It also set new speed records each time it flew. This was illustrated March 11, 1957, when it streaked nonstop on a press demonstration flight from Seattle to Baltimore in 3 hours 48 minutes at an average speed of 612 mph. Boeing delivered a total of 1,010 Boeing 707s, which dominated passenger air transport in the 1960s and remained common through the 1970s.
The proposed 735 and 738 models were swing tail cargo variants. The 735 had an upward swinging tail and 738 a sideways swinging one. Both models were shelved, however.
Versions
Civil models
707-120
Initial 179 pax model, with longer fuselage and wider wingspan than the 367-80 prototype. Powered by Pratt & Whitney JT3C-6 turbojet engines and with 112,6 tonnes gross weight, the -120's range was hardly sufficient for transatlantic flights. The 707-100B submodel introduced JT3D-1 turbofan engines and higher (117,1 tonnes) gross weight. Model 707-138 was a longer range derative with 3 meters shortened fuselage. 82 aircraft produced.
707-120B
Major upgrade, with more quiet, more powerful and more fuel efficient Pratt & Whitney JT3D-3 turbofan engines, rated at 80,1 kN each. First flight 22 June 1960 and 72 aircraft newly built, in addition to conversion of existing -120 models.
720
Originally designated 707-020, shortly identified as 717 (later used to identify the United States Air Force KC-135 Stratotanker, the 720 is a lighter, simplified, cheaper and faster 707-120 designed for medium-range operation from shorter runways. It was lighter and faster than the Boeing 707 and had a simplified wing design. This model had few sales but was still profitable due to the minimal R&D costs associated with modifying an existing type. First flight was on 23 November 1959, 64 built.
720B
Turbofan-powered version, with Pratt & Whitney JT3D-1-MC6 turbofans rated at 75.6 kN each and 107 tonnes gross weight. 88 aircraft built in addition to many conversions.
707-220
Hot-and-high version, with Pratt & Whitney JT4A-3 turbojet engines. Only five built, because of the arrival of the turbofan-powered 707-120B.
707-320 Intercontinental
Stretched 189 pax model, powered by JT4A-3 turbojets. More importantly, the -320 was the first truly intercontinental version because of its 2,800 km range increase. First flight was on 11 January 1958, and 69 turbojet -320s were produced.
707-320B
Re engined 152 tonnes gross weight version of the -320, powered by Pratt & Whitney JT3D-3 turbofan engines as used in the -120B. Aside from many -320 conversions, 175 aircraft were newly built. The 707-320B Advanced included three-section leading-edge flaps, reducing takeoff and landing speeds, and also altered the lift distribution of the wing, allowing the ventral fin found on earlier 707s to be removed. The same wing was also used on the 707-320C. This Convertible model turned out to be the most widely produced model, with 335 built.
707-420
Version of the -320, powered by 77.8 kN Rolls-Royce Conway 508 turbofans. Developed specifically for BOAC. 37 aircraft built for only three customers.
707-520
Proposed 2 ft stretched model, based on the -320. Cancelled.
707-520B
Proposed re engined -520 with JT3D-5A turbofans.
707-520-X
Proposed double decker with low wings. Length 191'7".
707-520-2X
Proposed shortened -520-X version.
707-520-3X
Proposed double decker with high wings. Length 144'2". Span 142'5".
707-620
May 1964, Boeing proposed two 707 Stretch models. The -620 had was 10 ft stretch of the -320 model, aimed at the domestic market and powered by Bristol 511 engines. Cancelled.
707-720
Proposed high gross weight version of the -320, powered by Bristol 511 engines. Cancelled.
707-820
The second 707 Stretch model, announce May 1964, aimed at the intercontinental market. Cancelled.
707-700
Designation for proposed CFM International CFM56 powered model. Cancelled in favour of the Boeing 757. However, the program paved the way for the retrofitting program of CFM56 engines to the USAF C-135/KC-135R models. The sole -700 prototype was delivered to Morocco as tanker aircraft.
Military models
C-18
See Boeing C-18.
C-135 Stratoliner/Stratotanker
See Boeing (K)C-135 Stratolifter/Stratotanker.
C-137
See Boeing C-137.
E-3 Sentry
E-6 Mercury
See Boeing E-6 Mercury.
E-8 J-Stars
See Boeing E-8 J-Stars.
T-49
See Boeing T-49.
Images
 Dash 80 |
 707 1st prototype |
 Eastern Airlines 720 |
 Republic of Togo 707-320B |
 Lufthansa 707-430 |
More information
External links
Sources
- Boeing Commercial Airplanes
- Air International
