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Encyclopedia > General Electric J79
General Electric J79
General Electric J79

The General Electric J79 is an axial-flow turbojet engine built for use in a variety of fighter aircraft and bomber aircraft. Produced by General Electric Aircraft Engines, it was one of the first US-designed engines to outperform designs from the United Kingdom , which had previously led in the jet field. Image File history File links Size of this preview: 800 × 600 pixelsFull resolution (2304 × 1728 pixel, file size: 544 KB, MIME type: image/jpeg) Description: GE J79-BMW-11a Source: user:Jaypee File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this... Image File history File links Size of this preview: 800 × 600 pixelsFull resolution (2304 × 1728 pixel, file size: 544 KB, MIME type: image/jpeg) Description: GE J79-BMW-11a Source: user:Jaypee File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this... Image File history File links Size of this preview: 800 × 600 pixelsFull resolution (2304 × 1728 pixel, file size: 518 KB, MIME type: image/jpeg) Description: GE J79-BMW-11a Source: user:Jaypee File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this... Image File history File links Size of this preview: 800 × 600 pixelsFull resolution (2304 × 1728 pixel, file size: 518 KB, MIME type: image/jpeg) Description: GE J79-BMW-11a Source: user:Jaypee File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this... The axial flow compressor is an improvement on the centrifugal compressor previously used in turbine engines,though small and micro turbines use centrifugal compressors with relative advantages (in terms of pressure ratios achieveable per stage of compression). ... Turbojets are the simplest and oldest kind of general purpose jet engine. ... This article or section does not adequately cite its references or sources. ... A bomber is a military aircraft designed to attack ground targets, primarily by dropping bombs. ... General Electric Aircraft Engines (GEAE) is the top supplier of aircraft engines in the world and offers engines for the majority of commercial aircraft. ...


It was developed in the 1950s as an outgrowth of the General Electric J73 engine program, originally called J73-GE-X24A, intended for reliable Mach 2 performance. J79 was a single-spool turbojet with a 17-stage compressor with a novel arrangement of variable stator blades which allow the engine to develop pressure similar to a twin-spool engine at a much lower weight. Each blade is made largely of titanium which was not used for large aircraft structures until the 1960s, and each blade today costs several thousand dollars to replace. This does not cite any references or sources. ... Mach number (Ma) is defined as a ratio of speed to the speed of sound in the medium in case. ... A gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume. ...


The first flight of the engine was in 1955 where the engine was placed in the bomb bay of a J47-powered B-45. The J79 was lowered from the bomb bay and the four J47s were shut down leaving the B-45 flying on the single J79. The first flight after testing was on 17 February 1956, on a Lockheed F-104A Starfighter. While the engine proved highly successful from an operational standpoint, the Vietnam War experience showed the disadvantages of its highly visible, smoky exhaust when used to power military aircraft. It enjoyed a production run of more than 30 years. 16,950 J79s were built in the United States and under license in Israel, Canada, Italy and Germany. This is a list of aviation-related events from 1955: Events February February 26 - George F. Smith becomes the first person to survive a supersonic ejection, from a North American F-100 Super Sabre travelling (Mach 1. ... Introduction The North American B-45 Tornado was the United States Air Forces first operational jet bomber, and the first jet aircraft to be refueled in the air. ... February 17 is the 48th day of the year in the Gregorian calendar. ... This is a list of aviation-related events from 1956: Events March March 10 - Lt Cdr Peter Twiss sets a new airspeed record in the Fairey Delta FD.2, also becoming the first person to exceed 1,000 mph. ... The Lockheed F-104 Starfighter is a single-engine, high-performance, supersonic interceptor aircraft that served with the United States Air Force (USAF) from 1958 until 1967 and continued in service with the Air National Guard until it was phased out in 1975. ... Combatants Republic of Vietnam United States Republic of Korea Thailand Australia New Zealand The Philippines National Front for the Liberation of South Vietnam Democratic Republic of Vietnam People’s Republic of China Democratic Peoples Republic of Korea Strength US 1,000,000 South Korea 300,000 Australia 48,000...


The J79 was replaced by the late 1960s in new fighter designs by afterburning turbofans such as the Pratt & Whitney TF30 used in the F-111 and F-14, and newer generation turbofans with the P&W F100 used in the F-15 Eagle which offer better cruise fuel economy by moving unburned air. For other uses of afterburner, see Afterburner (disambiguation). ... The TF-30, produced by Pratt & Whitney was the worlds first afterburning turbofan. ... A U.S. Air Force F-111 The General Dynamics F-111 Aardvark (the nickname was unofficial for most of its lifespan, but it was officially named Aardvark at its retirement ceremony for the United States Air Force) is a long-range strategic bomber, reconnaissance, and tactical strike aircraft. ... Sailors prepare an F-14 Tomcat for flight on the aircraft carrier USS Abraham Lincoln, in support of Operation Iraqi Freedom (2003). ... Schematic diagram of high-bypass turbofan engine CFM56-3 turbofan, lower half, side view. ... The F100 is an afterburning turbofan engine manufactured by Pratt & Whitney which powers the F-15 Eagle and F-16 Falcon. ... The Boeing (formerly McDonnell Douglas) F-15 Eagle is an all-weather tactical fighter designed to gain and maintain air superiority in aerial combat. ... Fuel efficiency, sometimes also referred to as fuel economy and commonly gas mileage in the United States, is a numeric measure often used to describe the amount of fuel consumed with regard to the distance travelled in a transportation vehicle, such as an automobile. ...

Perhaps the most famous aircraft to use the J79 was the F-4 Phantom II.
Perhaps the most famous aircraft to use the J79 was the F-4 Phantom II.

The J79 was used on the F-104 Starfighter, B-58 Hustler, F-4 Phantom II, A-5 Vigilante, IAI Kfir. A downgraded version of the F-16 with a J79 was proposed as a low-cost fighter for export, but found no customers. A simplified civilian version, designated the CJ-805, powered the Convair 880 and Convair 990 airliners. Bold textlink title File links The following pages link to this file: F-4 Phantom II General Electric J79 ... Bold textlink title File links The following pages link to this file: F-4 Phantom II General Electric J79 ... The McDonnell Douglas F-4 Phantom II[2] is a two-seat supersonic long-range all-weather fighter-bomber originally developed for the U.S. Navy by McDonnell Douglas. ... The Lockheed F-104 Starfighter is a single-engine, high-performance, supersonic interceptor aircraft that served with the United States Air Force (USAF) from 1958 until 1967 and continued in service with the Air National Guard until it was phased out in 1975. ... The Convair B-58 Hustler was a American high-speed jet bomber capable of Mach 2 supersonic flight. ... The McDonnell Douglas F-4 Phantom II[2] is a two-seat supersonic long-range all-weather fighter-bomber originally developed for the U.S. Navy by McDonnell Douglas. ... The North American A3J/A-5 Vigilante was a powerful, highly advanced carrier-based supersonic bomber designed for the US Navy. ... The Israel Aircraft Industries Kfir (Hebrew: כפיר, Lion Cub) is an Israeli-built all-weather, multi-role combat aircraft based on a modified Dassault Mirage 5 airframe, with Israeli avionics and an Israeli-made version of the General Electric J79 turbojet engine. ... The F-16 Fighting Falcon is a modern multi-role jet fighter aircraft built in the United States and used by dozens of countries all over the world. ... The first Convair 880 The Convair 880 was a jet airliner produced by the Convair division of General Dynamics. ... NASA Convair 990 The Convair 990 Coronado was a jet airliner produced by the Convair division of General Dynamics, a stretched version of their earlier Convair 880 produced in response to a request from American Airlines. ... An Airbus A340 airliner operated by Air Jamaica An airliner is a large fixed-wing aircraft with the primary function of transporting paying passengers. ...


In the F-104 and the F-4, the J79 made a unique howling sound at certain throttle settings. The sound is thought to be due to airflow in the exhaust section of the engine being disturbed by the engine bypass flaps. In a photo shoot of aircraft with GE jet engines, including the J79, a F-104 Starfighter collided with one of the few XB-70 Valkyrie test aircraft resulting in a massive crash and fatalities. This led to an end to publicity photo shoots of this nature. The Lockheed F-104 Starfighter is a single-engine, high-performance, supersonic interceptor aircraft that served with the United States Air Force (USAF) from 1958 until 1967 and continued in service with the Air National Guard until it was phased out in 1975. ... The North American XB-70 Valkyrie was conceived for the Strategic Air Command in the 1950s as a high-altitude bomber that could fly three times the speed of sound (Mach 3). ...


Like its host F-4 Phantom II, the J79 will be remembered as one of the most successful aviation products to come out of the 1950s and 1960s. The McDonnell Douglas F-4 Phantom II[2] is a two-seat supersonic long-range all-weather fighter-bomber originally developed for the U.S. Navy by McDonnell Douglas. ...


Many J79 engines have found uses as gas turbine power generators in remote locations, in applications such as the powering of pipelines.


Specifications (J79-GE-17)

American Eagle supersonic car display engine shows compressor blades smaller at each stage
American Eagle supersonic car display engine shows compressor blades smaller at each stage

General characteristics

  • Type: Afterburning turbojet engine
  • Length: 17.4 ft (5.3 m)
  • Diameter: 3.2 ft (1.0 m)
  • Dry weight: 3,850 lb (1,750 kg)

Components

Performance

  • Thrust: 11,905 lbf (52.9 kN) dry; 17,835 lbf (79.3 kN) with afterburner
  • Overall pressure ratio: 13.5:1
  • Turbine inlet temperature: 1,210 °F (655 °C)
  • Specific fuel consumption: 1.965 lb/(h·lbf) (200 kg/(h·kN)) with afterburner
  • Thrust-to-weight ratio: 4.6:1 (45.4 N/kg)

Image File history File linksMetadata Size of this preview: 796 × 599 pixelsFull resolution (1296 × 976 pixel, file size: 822 KB, MIME type: image/jpeg) North American Eagle J79 display engine shows compressor section blades I, the creator of this work, hereby release it into the public domain. ... Image File history File linksMetadata Size of this preview: 796 × 599 pixelsFull resolution (1296 × 976 pixel, file size: 822 KB, MIME type: image/jpeg) North American Eagle J79 display engine shows compressor section blades I, the creator of this work, hereby release it into the public domain. ... American Eagle can refer to: American Eagle Airlines American Eagle Outfitters, an American clothing retailer AMC Eagle car (also known as American Eagle) This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... A gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume. ... Turbojets are the simplest and oldest kind of general purpose jet engine. ... An animation of an axial compressor. ... Thrust is a reaction force described quantitatively by Newtons Second and Third Laws. ... Bold text The compression ratio is a single number that can be used to predict the performance of any engine (such as an internal-combustion engine or a Stirling Engine). ... Specific fuel consumption, often shortened to SFC, is an engineering term that is used to describe the fuel efficiency of an engine design w/ a mechanical output. ... Thrust-to-weight ratio (where weight means weight at the Earths surface) is a dimensionless parameter characteristic of rocket and jet engines, and of vehicles propelled by such engines (typically space launch vehicles and jet aircraft). ...

References

  • Neumann, Gerhard (June 1984). Herman the German (in English). William Morrow & Co, 269. ISBN 0-688-01682-0. “The former enemy alien and Air Corps G.I. whose inventive skills and maverick management techniques made jet engine history” 

  Results from FactBites:
 
General Electric J79 - Encyclopedia, History, Geography and Biography (417 words)
The General Electric J79 is an axial-flow turbojet engine built for use in a variety of fighter aircraft and bomber aircraft.
J79 was a single-shaft turbojet with a 17-stage compressor with a novel arrangement of variable stator blades which allow the engine to develop pressure similar to a two-stage engine at a much lower weight.
The J79 was used on the F-104 Starfighter, B-58 Hustler, F-4 Phantom II, A-5 Vigilante, IAI Kfir.
  More results at FactBites »

 
 

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