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Pratt & Whitney JT9D / F105


PW-JT9D

 

The JT9D was developed as part of the design phase of the C-5 Galaxy. A contract was awarded to Pratt & Whitney to study the type of large engine needed, but the production contract was eventually awarded to General Electric and their TF39 turbofan. First run in December 1966, the JT9D was chosen by Boeing to power the 747, with that aircraft's first flight taking place on 9 February 1969. Flight testing of the engine had begun in June 1968, using a Boeing B-52E as a testbed.
 
The Pratt & Whitney JT9D engine was the first high bypass ratio jet engine to power a wide-body aircraft. Its initial application was the Boeing 747-100, the original "Jumbo Jet". It was the company's first high-bypass-ratio turbofan and also the first of today's generation of large commercial turbofan engines to be produced.

The JT9D-3, which entered service in 1970, was constructed using titanium and nickel alloys. The engine featured a single stage fan, a three stage low pressure compressor and an eleven stage high pressure compressor coupled to a two stage high pressure turbine and four stage low pressure turbine. This version of the JT9D weighed 8,608 lb (3,905 kg) and produced 43,500 lbf (193,000 N) thrust. Production ceased in 1990.

JT9D engines powering USAF E-4A airborne command posts are designated Pratt & Whitney F105.
Pratt & Whitney's designated successor to the JT9D family is the PW4000, which features fewer parts, greater reliability, and lower base selling price.

 

Applications:
Airbus A300
Airbus A310
Boeing 747
Boeing 767
McDonnell Douglas DC-10

 

Specifications:  

JT9D-3A
Static Thrust: 45800 lbf
Basic Engine Weight: 8608 lb
Length: 128.2 in
Fan Diameter: 92.3 in
Used in: Boeing 747-100

 

JT9D-7
Static Thrust: 47900 lbf
Basic Engine Weight: 8850 lb
Length: 128.2 in
Fan Diameter: 92.3 in
Used in: Boeing 747

 

JT9D-20
Static Thrust: 49400 lbf
Basic Engine Weight: 8450 lb
Length: 128.2 in
Fan Diameter: 92.3 in
Used in: McDonnell Douglas DC-10, Boeing 747

 

JT9D-7Q/7Q3
Static Thrust: 53000 lbf
Basic Engine Weight: 9295 lb
Length: 132.1 in
Fan Diameter: 93.6 in
Used in: Boeing 747

 

JT9D-59A/70A
Static Thrust: 53000 lbf
Basic Engine Weight: 9155 lb
Length: 132.2 in
Fan Diameter: 93.6 in
Used in: McDonnell Douglas DC-10/Boeing 747/Airbus A300

 

JT9D-7R4D/D1
Static Thrust: 48000 lbf
Basic Engine Weight: 8905 lb
Length: 132.7 in
Fan Diameter: 93.4 in
Used in: Boeing 767/Airbus A310

 

JT9D-7R4G2
Static Thrust: 54750 lbf
Basic Engine Weight: 8935 lb
Length: 132.7 in
Fan Diameter: 93.4 in
Used in: Boeing 747

 

JT9D-7R4H1
Static Thrust: 56000 lbf
Basic Engine Weight: 8885 lb
Length: 132.7 in
Fan Diameter: 93.4 in
Used in: Airbus A300

 

 

 

 

 


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