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General Electric T700

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T700 / CT7
Type Turboshaft
National origin United States
Manufacturer GE Aviation
First run 1973
Major applications Bell AH-1W SuperCobra
Bell AH-1Z Viper
Bell UH-1Y Venom
Boeing AH-64 Apache
CASA/IPTN CN-235
KAI KUH-1 Surion
Saab 340
Sikorsky UH-60 Black Hawk
Sikorsky SH-60 Seahawk
Number built Over 20,000[1]
Developed into General Electric T901

TheGeneral Electric T700andCT7are a family ofturboshaftandturbopropengines in the 1,500–3,000 shp (1,100–2,200 kW) class.

Design and development

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In 1967, General Electric began work on a new turboshaft engine demonstrator designated the "GE12" in response to US Army interest in a next-generation utility helicopter.[2]The GE12 was designed and conceived by GE's Art Adamson and Art Adinolfi. In 1967, both GE and Pratt & Whitney were awarded contracts to work parallel with each other to design, fabricate, and test the technology.[2]The Army effort led, in the 1970s, to development of theSikorsky S-70Black Hawk, powered by twin GE "T700" turboshafts, the production descendant of the GE12.[2]

The T700 was initially bench-tested in 1973, passed military qualification in 1976, and went into production in 1978.[3]The initial "T700-GE-700" is an ungearedfree-turbine turboshaft,with a five-stage axial / one-stage centrifugal mixed-flow compressor, featuring one-piece "blisk"axial stages, with the inlet guide vanes and first two stator stages variable; an annular combustion chamber with central fuel injection to improve combustion and reduce smoke; a two-stage compressor turbine; and a two-stage free power turbine with tip-shrouded blades. The engine is designed for high reliability, featuring an inlet particle separator designed to spin out dirt, sand, and dust. The T700-GE-700 is rated at 1,622 shp (1,210 kW) intermediate power.

The T700-GE-700 was followed by improved and uprated Army engine variants for theUH-60 Black Hawkand theAH-64 Apachehelicopters, as well as marinized naval engine variants for theSH-60 Seahawkderivative of the Black Hawk, theSH-2G Seasprite,and theBell AH-1W Supercobra.T700s are also used on Italian and commercial variants of theAgustaWestland EH101/AW101helicopter, and Italian variants of theNHIndustries NH90helicopter. These are all twin-engine machines, except for the three-engined EH101.

The commercial version of the T700 is the "CT7", with the engine used on theBell 214ST(an enlarged version of the Huey), commercial Black Hawks, and theSikorsky S-92derivative of the Black Hawk, all of which are twin-engine helicopters.

The CT7 turboprop variants use the same core as the turboshaft variants, with a propeller gearbox fitted forward of the core. CT7 turboprops are used on variants of the SwedishSaab 340airliner, the Indonesian-Spanish AirtechCN-235cargolifter, and the CzechLet L-610G airliner, all twin-turboprop aircraft. The baseline CT7-5A provides 1,735 shp (1,294 kW) on takeoff.

In the late 1980s, GE also proposed a much larger turboprop, theT407/GLC38,with a five-stage axial/one-stage centrifugal mixed-flow compressor, an annular combustor with 15 burners; a two-stage compressor turbine, a three-stage power turbine, and max takeoff power of 6,000 shp (4,475 kW).

The YT706 engine is based on the CT7-8A engine. Compared with the H-60's primary T700 engine, the T706 has a larger compressor, hot section improvements, and full authority digital engine control.[4]The T706 is rated at 2,600 shp (1,939 kW) and increases the hot-and-high mission capability of the U.S. Army'sMH-60M Black Hawkfor Special Operations applications.[5]

Variants

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US Marines perform maintenance on the T700-GE-401C from aBell UH-1Yhelicopter

T700:Military turboshaft engine.

  • YT700:Prototype version.
  • T700-GE-700:Initial T700 variant.
  • T700-GE-701:The improved T700-GE-701A, -701B, -701C,-701D versions have also been developed from the original -700.[6]
  • T700-GE-401:Navalised version for SH-60 Seahawk helicopters.
  • T700-GE-401C:Universal application version of the -401.
  • T700-GE-701C:Universal application version of the -701.
  • T700-TEI-701D:Licensed produced version ofTusaş Engine IndustriesofTurkey.Developed for use in the Sikorsky/Turkish Aerospace Industries T-70 utility helicopter.[7]
  • T700-701K:First rear-drive version of the T700 family, a product from the joint development with Samsung Techwin (later becameHanwha Aerospace). Powering theKAI KUH-1 Surionwith Hanwha's licensed production.[8]

CT7 turboshaft:Commercial version of T700.

  • CT7-2A:Basic model
  • CT7-2D:Higher flow compressor and surface coatings to improve resistance to wear and corrosion
  • CT7-2D1:Similar to the CT7-2D but uses a CT7-6 type hot section
  • CT7-2E1:Leonardo Helicopters AW189
  • CT7-6/-6A:The CT7-6/-6A turboshaft engines are upgraded commercial variants of the successful T700/CT7 engine family. The turboshaft engine powers the entire development fleet ofAgustaWestland AW101helicopters with thousands of flight hours of operation.[9]
  • CT7-8:The CT7-8 is a family of powerful engines in the 2,500 to 3,000 shp class. They are more powerful and more efficient versions of its predecessors.[9]
  • CT7-8A:A version of the CT7-8 family used to power olderSikorsky S-92/H-92helicopters.
  • CT7-8A1:A more fuel efficient version of the CT7-8A. It is used to power newer Sikorsky S-92/H-92 helicopters. The CT7-8A1 produces 2,520 shp.
  • CT7-8A5
  • CT7-8A7:Developed by GE as an uprated, more efficient and more reliable version of the CT7-8A1 engine for theRoyal Canadian Air Force'sSikorsky CH-148 Cyclonehelicopters. It is the most modern version of the CT7/T700 engine family. The CT7-8A7 produces 3,000 shp.
  • CT7-8B
  • CT7-8B5
  • CT7-8E
  • CT7-8E5
  • CT7-8E6
  • CT7-8F
  • CT7-8F5

CT7 turboprop:Turboprop version of CT7.

  • CT7-3:Compact shortened and lightened version.[10]
  • CT7-5A2
  • CT7-5A3
  • CT7-7A
  • CT7-7A1
  • CT7-9B
  • CT7-9B1
  • CT7-9B2
  • CT7-9C
  • CT7-9C3
  • CT7-9D
  • CT7-9D2

Applications

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A U.S. Navy Sailor performing maintenance on a T700 engine from a MH-60R Sea Hawk.

T700/CT7 turboshaft

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YT706 turboshaft

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CT7 turboprop

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Specifications (T700)

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General characteristics

  • Type:Turboshaftengine
  • Length:47 in (1,200 mm) (T700-GE-700/701 series); 48.2 in (1,220 mm) (T700/T6A)
  • Diameter:25 to 26 in (640 to 660 mm) (T700/T6E)
  • Dry weight:
    • 400 lb (180 kg) (YT700-GE-700)
    • 437 lb (198 kg) (T700-GE-700)
    • 537 lb (244 kg) (T700/T6E)

Components

Performance

See also

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Related development

Related lists

References

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  1. ^Kover, Amy; Kellner, Tomas (December 16, 2019)."Stayin' Alive: Trusty GE Chopper Engine That Entered Service When The Bee Gees Ruled The Charts Wins New $1 Billion Lease On Life".GE Reports: Future of Flight.RetrievedMay 15,2021.
  2. ^abcLeyes, Richard A.; Fleming, William A. (1999).The History of North American Small Gas Turbine Aircraft Engines.AIAA.ISBN9781563473326.Retrieved5 October2017.
  3. ^"Unknown Title".Verti-flite, Volume 37.1991.Retrieved5 October2017.
  4. ^"GE YT706 Production Contract Awarded by US Army".GE Aviation. 2007-08-13. Archived fromthe originalon 2007-10-23.Retrieved2007-08-16.
  5. ^"Sikorsky S-70A."(online subscription article)Jane's All the World's Aircraft,25 May 2016.
  6. ^"The General Electric T-700/T-701C".Archived fromthe originalon 2014-05-02.Retrieved2022-07-09.
  7. ^"TEI TO POWER BLACKHAWKS |".www.tei.com.tr.Archived fromthe originalon 2016-09-19.Retrieved2016-09-17.
  8. ^"T700-701K turboshaft engines datasheet"(PDF).GE Aerospace.
  9. ^ab"The CT7 Engine - GE Aviation".www.geaviation.com.
  10. ^John W.R. Taylor, ed. (1988).Jane's All the World's Aircraft 1988-89.London: Jane's Information Group.ISBN0-7106-0867-5.
  11. ^Govt Competitive Test UTTAS YUH-60A, USAAEFA Proj # 74-06-1
  12. ^"GE YT706 Power Specifications".GE Aviation. Archived fromthe originalon 2011-06-14.Retrieved2011-06-02.
  13. ^Peter deBock (September 18, 2019).GE turbines and small engines overview(PDF).ARPA-e INTEGRATE meeting.Global Research.General Electric.

The initial version of this article was based on apublic domainarticle fromGreg Goebel's Vectorsite.

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