General Electric J73

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J73
General Electric J73.jpg
Cutaway of a J73 at the NMUSAF
Type Turbojet
National origin United States
Manufacturer General Electric
Major applications North American F-86H Sabre
Number built 870
Unit cost $145,000
Developed from General Electric J47
Developed into General Electric J79

The General Electric J73 turbojet was developed by General Electric from the earlier J47 engine. Its original USAF designation was J47-21, but with innovative features including variable inlet guide vanes, double-shell (inner and outer) combustor case and 50% greater airflow was redesignated the J73. It was only used in the North American F-86H.

Design and Development[edit]

An engine, uprated from the J47, was required for the F-86H. The mass flow was increased by relocating accessories from the centre of the compressor inlet to the underside of the engine. This allowed a reduction in blade hub diameter, which together with an increase in tip diameter, gave a bigger area for air to enter the compressor. The area through the combustion chambers also had to be increased.[1] This was done by replacing the multiple individual chambers with a single annular casing with individual flame tubes or cans known as cannular.

The pressure ratio was increased and variable inlet guide vanes fitted to prevent low-RPM problems (rotating stall/blade flutter)[2] with the higher design pressure ratio. A 2-stage turbine was required.[3]

A low boost (10% at take-off) afterburner was fitted. It was known as a tailpipe augmentation (TPA) system.[3]

Variants[edit]

F-86H Sabre
J73-GE-1
J73-GE-3
9,200 lbf (40.92 kN) for the North American F-86H Sabre
J73-GE-5

Applications[edit]

YF-84J Thunderstreak

Specifications (J73-GE-5)[edit]

Data from Flight.[4]

General characteristics

  • Type: Turbojet
  • Length: 200 in (5 m)
  • Diameter: 39.5 in (1 m)
  • Dry weight: 3,650 lb (1,656 kg)

Components

  • Compressor: 12 stage, axial flow, variable inlet guide vanes
  • Combustors: 10 cannular combustion chambers
  • Turbine: 2 stage

Performance

See also[edit]

Related development
Comparable engines
Related lists

References[edit]

Notes
  1. ^ https://www.flightglobal.com/pdfarchive/view/1957/1957%20-%201043.html
  2. ^ http://webserver.dmt.upm.es/zope/DMT/Members/jmtizon/turbomaquinas/NASA-SP36_extracto.pdf Fig 27a and p.44
  3. ^ a b seven decades of progress, General Electric, Aero Publishers Inc., Fallbrook, ISBN 0-8168-8355-6, p.82
  4. ^ Flight, 9 April 1954, p.457. Retrieved: 6 February 2009
Bibliography
  • Gunston, Bill (2006). World Encyclopedia of Aero Engines, 5th Edition. Phoenix Mill, Gloucestershire, England, UK: Sutton Publishing Limited. ISBN 0-7509-4479-X. 
  • Kay, Anthony L. (2007). Turbojet History and Development 1930֪–1960 Volume 2:USSR, USA, Japan, France, Canada, Sweden, Switzerland, Italy and Hungary (1st ed.). Ramsbury: The Crowood Press. ISBN 978-1861269393. 

External links[edit]