The General Electric T700 and CT7 are a family of

turboshaft A turboshaft engine is a form of gas turbine that is optimized to produce shaftpower rather than jet thrust. In concept, turboshaft engines are very similar to turbojets, with additional turbine expansion to extract heat energy from the exhaust ...

and

turboprop A turboprop is a turbine engine that drives an aircraft propeller. A turboprop consists of an intake, reduction gearbox, compressor, combustor, turbine, and a propelling nozzle. Air enters the intake and is compressed by the compressor. Fuel ...

engines in the class.

Design and development

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. 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. The Army effort led, in the 1970s, to development of the

Sikorsky S-70 The Sikorsky S-70 is an American medium transport/utility helicopter family manufactured by Sikorsky Aircraft. It was developed for the United States Army in the 1970s, winning a competition to be designated the UH-60 Black Hawk and spawning a ...

Black Hawk, powered by twin GE "T700" turboshafts, the production descendant of the GE12. The T700 was initially bench-tested in 1973, passed military qualification in 1976, and went into production in 1978. The initial "T700-GE-700" is an ungeared

free-turbine turboshaft A free-turbine turboshaft is a form of turboshaft or turboprop gas turbine engine where the power is extracted from the exhaust stream of a gas turbine by an independent turbine, downstream of the gas turbine. The power turbine is not mechanically ...

, with a five-stage axial / one-stage centrifugal mixed-flow compressor, featuring one-piece "

blisk A blisk (portmanteau of bladed disk) is a turbomachine component comprising both rotor disk and blades. It serves as a critical component of the engine compressor to allow a sufficient quantity of compressed air to enter the engine for combustion ...

" 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 the

UH-60 Black Hawk The Sikorsky UH-60 Black Hawk is a four-blade, twin-engine, medium-lift utility military helicopter manufactured by Sikorsky Aircraft. Sikorsky submitted the S-70 design for the United States Army's Utility Tactical Transport Aircraft System ...

and the

AH-64 Apache The Boeing AH-64 Apache () is an American twin-turboshaft attack helicopter with a tailwheel-type landing gear arrangement and a tandem cockpit for a crew of two. It features a nose-mounted sensor suite for target acquisition and night vis ...

helicopters, as well as marinized naval engine variants for the

SH-60 Seahawk The Sikorsky SH-60/MH-60 Seahawk (or Sea Hawk) is a twin turboshaft engine, multi-mission United States Navy helicopter based on the United States Army UH-60 Black Hawk and a member of the Sikorsky S-70 family. The most significant modificatio ...

derivative of the Black Hawk, the

SH-2G Seasprite The Kaman SH-2G Super Seasprite is an American ship-based helicopter with anti-submarine, anti-surface threat capability, including over-the-horizon targeting. This aircraft extends and increases shipboard sensor and weapon capabilities against ...

, and the

Bell AH-1W Supercobra The Bell AH-1 SuperCobra is a twin-engined attack helicopter that was developed on behalf of, and primarily operated by, the United States Marine Corps (USMC). The twin Cobra family, itself part of the larger Huey family, includes the AH-1J Se ...

. T700s are also used on Italian and commercial variants of the AgustaWestland EH101/AW101 helicopter, and Italian variants of the

NHIndustries NH90 The NHIndustries NH90 is a medium-sized, twin-engine, multi-role military helicopter. It was developed in response to NATO requirements for a battlefield helicopter which would also be capable of being operated in naval environments. The NH90 ...

helicopter. 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 the

Bell 214ST The Bell 214ST is a medium-lift, twin-engine helicopter descended from Bell Helicopter's ubiquitous UH-1 Huey series. Though it shares a type number with the somewhat-related Bell 214, the 214ST is larger and of quite different appearance. Desi ...

(an enlarged version of the Huey), commercial Black Hawks, and the

Sikorsky S-92 The Sikorsky S-92 is an American twin-engine medium-lift helicopter built by Sikorsky Aircraft Sikorsky Aircraft is an American aircraft manufacturer based in Stratford, Connecticut. It was established by aviation pioneer Igor Sikorsky in 1 ...

derivative 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 Swedish

Saab 340 The Saab 340 is a Swedish twin-engine turboprop aircraft designed and initially produced by Saab AB and Fairchild Aircraft. It is designed to seat 30-36 passengers and, as of July 2018, there were 240 operational aircraft used by 34 different o ...

airliner, the Indonesian-Spanish Airtech

CN-235 The CASA/IPTN CN-235 is a medium-range twin-engined transport aircraft that was jointly developed by CASA of Spain and Indonesian manufacturer IPTN. It is operated as both a regional airliner and military transport; its primary military roles i ...

cargolifter, and the Czech

Let L-610 The Let L-610 is a prototype aircraft for the Czech civil aircraft manufacturer Let Kunovice made in 1988–1997. Design and development In the late 1970s, after the success of the LET L-410 twin engine turboprop, the Soviet airline Aeroflot r ...

G 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, the T407/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. The T706 is rated at 2,600 shp (1,939 kW) and increases the hot-and-high mission capability of the U.S. Army's MH-60M Black Hawk for Special Operations applications."Sikorsky S-70A."
(online subscription article) ''Jane's All the World's Aircraft'', 25 May 2016.

Variants

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. *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 of

Tusaş Engine Industries Tusaş Engine Industries (TEI; tr, TUSAŞ Motor Sanayii A.Ş.) is an aerospace engine manufacturer and a design center for the production of engines and engine parts for commercial and military aircraft. It is based in Eskişehir, Turkey. TEI wa ...

Turkey Turkey ( tr, Türkiye ), officially the Republic of Türkiye ( tr, Türkiye Cumhuriyeti, links=no ), is a list of transcontinental countries, transcontinental country located mainly on the Anatolia, Anatolian Peninsula in Western Asia, with ...

. Developed for use in the Sikorsky/Turkish Aerospace Industries T-70 utility helicopter. 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 *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 of

AgustaWestland AW101 The AgustaWestland AW101 is a medium-lift helicopter in military and civil use. First flown in 1987, it was developed by a joint venture between Westland Helicopters in the United Kingdom and Agusta in Italy in response to national requirement ...

helicopters with thousands of flight hours of operation. *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. *CT7-8A: A version of the CT7-8 family used to power older Sikorsky S-92/H-92 helicopters. *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 the

Royal Canadian Air Force The Royal Canadian Air Force (RCAF; french: Aviation royale canadienne, ARC) is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environm ...

Sikorsky CH-148 Cyclone The Sikorsky CH-148 Cyclone is a twin-engine, multi-role shipboard helicopter developed by the Sikorsky Aircraft Corporation for the Canadian Armed Forces. A military variant of the Sikorsky S-92, the CH-148 is designed for shipboard operations ...

helicopters. 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 *CT7-8F *CT7-8F5 CT7 turboprop: Turboprop version of CT7. *CT7-3:Compact shortened and lightened version. *CT7-5A2 *CT7-5A3 *CT7-7A *CT7-7A1 *CT7-9B *CT7-9B1 *CT7-9B2 *CT7-9C *CT7-9C3 *CT7-9D *CT7-9D2

Applications

T700/CT7 turboshaft

AgustaWestland CH-149 Cormorant The AgustaWestland CH-149 Cormorant is the Canadian Forces designation for the AgustaWestland AW101 (formerly EH101), a helicopter used for air-sea rescue in Canada. Developed as a joint venture between Westland Aircraft in the UK and Agusta i ...

Lockheed Martin VH-71 Kestrel The Lockheed Martin VH-71 Kestrel was a variant of the AgustaWestland AW101 (formerly the EH101) that was being manufactured to replace the United States Marine Corps' Marine One U.S. Presidential transport fleet. Originally marketed for vario ...

AgustaWestland AW149 The AgustaWestland AW149 is a medium-lift multi-role military helicopter developed by AgustaWestland, now Leonardo, launched in 2006. On 20 June 2011 AgustaWestland announced the AW189, a civilian development of the AW149, for service in 2013. ...

AgustaWestland AW189 The AgustaWestland AW189 is a twin-engined, super-medium-lift helicopter manufactured by Leonardo S.p.A. It is derived from the AW149, and shares similarities with the AW139 and AW169. Development On 20 June 2011, development of the eight-tonn ...

Bell 525 The Bell 525 Relentless is an American super-medium-lift helicopter, under development by Bell Textron. The Bell 525 was unveiled at the 2012 Heli-Expo in Dallas, Texas in February 2012. The helicopter first flew on 1 July 2015. It is designed ...

Bell AH-1W SuperCobra The Bell AH-1 SuperCobra is a twin-engined attack helicopter that was developed on behalf of, and primarily operated by, the United States Marine Corps (USMC). The twin Cobra family, itself part of the larger Huey family, includes the AH-1J Se ...

Bell AH-1Z Viper The Bell AH-1Z Viper is a twin-engine attack helicopter, based on the AH-1W SuperCobra, designed and produced by the American aerospace manufacturer Bell Helicopter. Being one of the latest members of the prolific Bell Huey family, it is also c ...

Bell UH-1Y Venom The Bell UH-1Y VenomDoD 4120-15L, ''Model Desi ...

Boeing AH-64 Apache The Boeing AH-64 Apache () is an American twin-turboshaft attack helicopter with a tailwheel-type landing gear arrangement and a tandem cockpit for a crew of two. It features a nose-mounted sensor suite for target acquisition and night visi ...

KAI Surion The KAI KUH-1 Surion is a twin-engine, transport utility helicopter developed primarily by Korea Aerospace Industries (KAI), Agency for Defense Development (ADD) and Korea Aerospace Research Institute (KARI) jointly with Eurocopter. In 2006, th ...

Kaman SH-2G Super Seasprite The Kaman SH-2G Super Seasprite is an American ship-based helicopter with anti-submarine, anti-surface threat capability, including over-the-horizon targeting. This aircraft extends and increases shipboard sensor and weapon capabilities agains ...

* Kamov Ka-64 Sky Horse *

* Sikorsky S-70/H-60 series **

Mitsubishi H-60 The Mitsubishi H-60 series is twin-turboshaft engine helicopter based on the Sikorsky S-70 helicopter family for use by the Japan Self-Defense Forces (JSDF). The SH-60J/K/L are anti-submarine patrol versions for the Japan Maritime Self-Defense F ...

Piasecki X-49 The Piasecki X-49 "SpeedHawk" is an American four-bladed, twin-engined experimental high-speed compound helicopter developed by Piasecki Aircraft. The X-49A is based on the airframe of a Sikorsky YSH-60F Seahawk, but utilizes Piasecki's proprie ...

Sikorsky HH-60 Jayhawk The Sikorsky MH-60T Jayhawk is a multi-mission, twin-engine, medium-range helicopter operated by the United States Coast Guard for search and rescue, law enforcement, military readiness and marine environmental protection missions. It was orig ...

Sikorsky HH-60 Pave Hawk The Sikorsky MH-60G/HH-60G Pave Hawk is a four-blade, twin-engine, medium-lift utility military helicopter manufactured by Sikorsky Aircraft. It is a derivative of the UH-60 Black Hawk and incorporates the US Air Force PAVE electronic systems ...

Sikorsky SH-60 Seahawk The Sikorsky SH-60/MH-60 Seahawk (or Sea Hawk) is a twin turboshaft engine, multi-mission United States Navy helicopter based on the United States Army UH-60 Black Hawk and a member of the Sikorsky S-70 family. The most significant modificatio ...

Sikorsky UH-60 Black Hawk The Sikorsky UH-60 Black Hawk is a four-blade, twin-engine, medium-lift Utility helicopter, utility military helicopter manufactured by Sikorsky Aircraft. Sikorsky submitted the S-70 design for the United States Army's Utility Tactical Transpo ...

YT706 turboshaft

* Sikorsky MH-60M Black Hawk *

Sikorsky S-97 Raider The Sikorsky S-97 Raider is a high-speed scout and attack compound helicopter based on the Advancing Blade Concept (ABC) with a coaxial rotor system under development by Sikorsky Aircraft. Sikorsky planned to offer it for the United States ...

CT7 turboprop

CASA/IPTN CN-235 The CASA/IPTN CN-235 is a medium-range twin-engined transport aircraft that was jointly developed by CASA of Spain and Indonesian manufacturer IPTN. It is operated as both a regional airliner and military transport; its primary military roles ...

G *

Sukhoi Su-80 The Sukhoi Su-80 (formerly known as the Sukhoi S-80) is a Russian twin-turboprop, twin-boom STOL transport aircraft. Design and development The Su-80 program was supposed to start in the late 1990s, but due to lack of funds, it was postponed f ...

Specifications (T700)

References

External links

General Electric T700/CT7 Engine Family page on GE Aviation site

General Electric CT7 Cutaway by FlightGlobal.com
{{USAF gas turbine engines T700 1970s turboshaft engines