General Electric GE38

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Template:Short description

GE38 / T408
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The T408 on a CH-53K King Stallion
Type Turboshaft
National origin United States
Manufacturer GE Aviation
First run December 26, 1989
Major applications Sikorsky CH-53K King Stallion (T408)
Developed into CFE CFE738

The General Electric GE38 is a gas turbine developed by GE Aviation for turboprop and turboshaft applications. It powers the Sikorsky CH-53K King Stallion as the T408.[1]

Design and development

The GE27 was developed in the early 1980s under the "Modern Technology Demonstrator Engines" (MTDE) program sponsored by the United States Army Aviation Applied Technology Directorate.[2] Sporting a 22:1 pressure ratio, which was a record for single-spool compressors at the time, the GE27[3] was GE's unsuccessful submission to power the Bell Boeing V-22 Osprey tiltrotor aircraft. The GE27 also had a compressor air flow of Script error: No such module "convert". and a turbine temperature of Script error: No such module "convert"..[2] The GE27 first ran in late 1984, but it unexpectedly lost the V-22 engine competition to the Allison 501-M80C, which was not a participant in the MTDE program.[4]

In the late 1980s, GE used the GE27 as the basis for the commercial development of turboshafts, turboprops, turbofans, and propfans under the GE38 name. GE formed a 50/50 venture with Garrett (then a division of AlliedSignal) to develop the turbofan variant[5] called the CFE (Commercial Fan Engines) CFE738, which used the GE27's gas generator core.[2] One of a range of advertised GE38 unducted fan (UDF) sizes,[5] the Template:Cvt takeoff thrust GE38-B5 was for a time the baseline engine for the West German-Chinese MPC 75 regional airliner.[6] The GE38 became the T407 military turboprop in partnership with Lycoming Engines for the Lockheed P-7A, with a maximum takeoff power of 6,000 shp (4,475 kW). First run on December 26, 1989,[7] the T407 engine was scheduled to undergo flight testing on a Lockheed P-3 Orion testbed aircraft in the summer of 1990,[8] but the US Navy canceled Lockheed's P-7 contract on July 20, 1990.[9] The commercial version of the T407 was the GLC38 (General Electric/Lycoming Commercial 38), which was unsuccessfully offered for several turboprop airliners in the late 1980s and early 1990s.[2]

The new T408 (GE38-1B) is slated to power the new Sikorsky CH-53K King Stallion three-engined helicopter for the US Marine Corps. It has a power rating of 7,500 shp.[10] The GE38 completed its first round of ground testing in May 2010.[11] Two test engines have completed over 1,000 hours of ground testing by November 2011. Five test engines will be used in the 5,000-hour test program.[12] In September 2019, GE delivered the first production T408 engine to the U.S. Naval Air Systems Command (NAVAIR) for the CH-53K.[13] GE also offered the engine to power the U.S. Navy's Ship-to-Shore Connector air-cushioned landing craft.

The T408 was also tested by the U.S. Army and Boeing as an alternative powerplant on an NCH-47D Chinook testbed helicopter. The helicopter configuration was ground tested beginning in late 2019, followed by an initial flight on September 22, 2020.[14] Conclusion of the test trials was announced on May 12, 2021.[15]

Variants

T407-GE-400
T408-GE-400 (GE38-1B)
CFE CFE738
Turbofan variant of the T407-GE-400, used on the Dassault Falcon
CPX38
Proposed turboprop engine variant of the GE38-1B[17]
GE38-3
An Template:Cvt class derivative engine under consideration by the U.S. military in 2006[18]
GE38-B5
A contra-rotating, ungeared, unducted fan (UDF) derivative with a bare engine weight (including the UDF) of Template:Cvt, a UDF diameter of Script error: No such module "convert"., and a blade count of 11 on one propeller and 9 on the other; provides a takeoff thrust of Template:Cvt with a thrust-specific fuel consumption (TSFC) of Template:Cvt, and a cruise thrust of Template:Cvt with a TSFC of Template:Cvt; proposed for the MPC 75 German-Chinese regional airliner in the late 1980s[6]
GLC38
Proposed turboprop variant of the T407-GE-400

Applications

Specifications (T408)

Data from GE Aviation.[19]

General characteristics

  • Type: Turboprop/turboshaft
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Components

  • Compressor: 5+1 Axi-Centrifugal compressor (5 axial stages and 1 centrifugal stage)
  • Turbine: a 3-Stage Power Turbine, a 2-stage-single crystal cooled HP turbine
  • Oil system: synthetic

Performance

See also

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Comparable engines

Related lists

References

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  1. ↑ Sikorsky Unveils CH-53K Helicopter; U.S. Marine Corps Reveals Aircraft Name
  2. ↑ a b c d Script error: No such module "citation/CS1".
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  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ "GE Launches New Engine Program for U.S. Marine Corps Heavy-lift Helicopter". GE Aviation, January 24, 2007.
  11. ↑ "GE38 Completes First Engine to Test Program". GE Aviation, May 6, 2010.
  12. ↑ "GE38 Looking to Take to the Sea". GE Aviation, January 18, 2011.
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".
  19. ↑ Model GE38 Template:Webarchive. GE Aviation. Retrieved: 19 October 2010.
  20. ↑ Script error: No such module "citation/CS1".

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Bibliography

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External links

Template:GE aeroengines Template:USAF gas turbine engines

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