General Electric GE4

GE4
	The General Electric GE4/J5 afterburning turbojet
Type	Turbojet
National origin	United States
Manufacturer	General Electric
First run	1967
Major applications	Boeing 2707
Produced	1967 - 1972
Number built	3[citation needed]
Developed from	General Electric YJ93

A mock-up of the GE4/J5 single-shaft afterburning turbojet

The General Electric GE4 turbojet engine was designed in the late 1960s as the powerplant for the Boeing 2707 supersonic transport. The GE4 was a nine-stage, single-shaft, axial-flow turbojet based largely on the General Electric YJ93 which powered the North American XB-70 bomber.^[1] The GE4 was the most powerful engine of its era, producing 50,000 lbf (220 kN) dry, and 65,000 lbf (290 kN) with afterburner.^[2] The Boeing 2707 was cancelled in 1971, putting an end to further work on the GE4.

Specifications (GE4/J5P)[]

Data from ^[3]^[4]

General characteristics

Type: Turbojet
Length: 27ft 4 in (8,331mm)
Diameter: 5ft 11 in (1,803mm)
Dry weight: 11,300 lb (5,100 kg)^[5]

Components

Compressor: Nine-stage axial^[5]
Combustors: Annular straight-through-flow^[5]
Turbine: Two-stage axial^[5]
Fuel type: Special high-temperature JP-6 Fuel

Performance

Maximum thrust: 50,000 lbf (220 kN) (63,200 lbf (281 kN) with afterburning)
Overall pressure ratio: 12.5:1^[5]
Turbine inlet temperature: 2,200 °F (1,204 °C)^[5]
Thrust-to-weight ratio: 6.02

Other Specifications[]

Compressor inlet diameter: 60.6 in (1,539 mm)^[5]
Exhaust nozzle diameter: 74.2 in (1,880 mm)
Core airflow: 620 lb (280 kg) per second
Noise:
- Takeoff: 104 dB
- Sideline: 117 dB
- Approach: 107 dB

References[]

^ FLIGHT International. 6 January 1966. p. 33.
^ FLIGHT International. 6 January 1972. pp. 16a-17.
^ "SUPERSONIC TRANSPORT DEVELOPMENT PROGRAM. PHASE III PROPOSAL. BOEING MODEL 2707". Retrieved 2008-12-29.^{[permanent dead link]}
^ FLIGHT International. 5 January 1967. p. 23.
^ Jump up to: ^a ^b ^c ^d ^e ^f ^g Aircraft engines of the world, Paul H. Wilkinson, 1970. ISBN 0-911710-24-8

[1] FLIGHT International. 6 January 1966. p. 33.

[2] FLIGHT International. 6 January 1972. pp. 16a-17.

[SUPERSONIC_TRANSPORT_DEVELOPMENT_PROGRAM._PHASE_III_PROPOSAL._BOEING_MODEL_2707.-3] "SUPERSONIC TRANSPORT DEVELOPMENT PROGRAM. PHASE III PROPOSAL. BOEING MODEL 2707". Retrieved 2008-12-29.^{[permanent dead link]}

[4] FLIGHT International. 5 January 1967. p. 23.

[wilkinson-5] Jump up to: ^a ^b ^c ^d ^e ^f ^g Aircraft engines of the world, Paul H. Wilkinson, 1970. ISBN 0-911710-24-8

[1]

[2]

[3]

[4]

[5]

show v t General Electric aircraft engines
Turbojets	CJ610 CJ805 GE4/J5P J31 J33 J35 J47 J73 J79 J85 J87 YJ93 J97 YJ101
Turbofans	Affinity CF6 CF34 CF700 CFE738† CFM56† CJ805-23 F101 F108† F110 F118 YF120 F136† F404/F412 F414 GE90 GE9X GEnx GP7000† HF120† LEAP† Passport RM12† TF34 TF39 XA100
Turboprops/Turboshafts	Catalyst CT7 CT58 CT64 GE27 GE36 GE38 H-Series T31 T58 T64 T407 T408 T700 T901
Aeroderivative gas turbine engines	LM500 LM1500 LM1600 LM2500 LM6000 LM9000 LMS100
† Joint development aeroengines