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Safran Silvercrest

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Silvercrest
The engine on display at Paris Air Show 2013
Type Turbofan
National origin France
Manufacturer Snecma
First run September 2012[1]
Major applications Cessna Citation Hemisphere
Dassault Falcon 5X
Number built 7 (as of Summer 2014)[2]
side view

The Snecma Silvercrest is a French turbofan currently under development which will be manufactured by Snecma.

Design and development

Announced at the 2006 NBAA convention,[3][4] the engine was originally designed as an 8,500- to 10,500-pound thrust turbofan[5] to power super mid-size to large cabin business jets or 40 to 60-seat regional jets with a MTOW between 45,000 and 60,000 lb.[6] Lately, thrust range has been quoted to 10,000 to 12,000 pounds.[7]

The two-shaft engine architecture includes a 42.5-inch (1.08 m) fan with solid wide-chord swept blades, followed by 4 boost stages, all driven by a 4-stage low pressure turbine. The HP spool has 4 axial compressor stages and 1 centrifugal stage, driven by a single-stage turbine.[1] An axi-centrifugal compressor is unusual for an engine in this 10,000-to-12,000-pounds-thrust range.[7]

Turbomeca, which like Snecma is a part of the SAFRAN Group, participates in the design of the centrifugal compressor stage.[8]

Early design featured a smaller 40-inch fan, no booster, one more high-pressure compressor stage, one low-pressure turbine stage less and a lower 4.5 bypass ratio.[8][9] At an early stage of the project, the overall pressure ratio was 27:1 with a core pressure ratio of "over 17".[8]

The high pressure spool and combustor have been run in a US$120 million core-demonstrator called SM-X, reaching the take-off speed of 20,300rpm.[4][10] While a full engine demonstrator was due to run towards the end of 2008[citation needed], the FETT (First Engine To Test) started ground-based testing in September 2012.[1][11] After a 6+ month delay, the in-flight tests started mid-2014 on a Grumman Gulfstream II and should take place in Istres.[12][13]

Engine certification, originally pencilled in for the end of 2010 or early 2011,[8] has been re-scheduled for late in 2016.[14] Availability was planned towards 2012.[15]

Applications

Silvercrest
Cessna Citation Hemisphere, first flight 2019, with over 12,000 lbf (53 kN) of thrust.[16]
Silvercrest SC-2D
Dassault Falcon 5X ; 11,450 lbf (50.9 kN), both aircraft and official engine selection were simultaneously unveiled at the National Business Aviation Association annual convention in October 21, 2013.[17] Entry into service: 2020[18]

Specifications (2D)

Data from Snecma[19]

General characteristics

  • Type: axial and centrifugal flow, twin-shaft, bypass turbofan engine
  • Length: approx. 74 inches (1,900 mm)[8]
  • Diameter: 42.5 inches (1,080 mm) Fan
  • Dry weight: 2,290 lb (1,040 kg)[20]

Components

  • Compressor: 4 low-pressure stages, 4 high-pressure blisks + 1 centrifugal stage
  • Turbine: 1 high-pressure, 4 low-pressure stages

Performance

See also

Comparable engines

Related lists

References

  1. ^ a b c Thierry Dubois (2013-10-31). "Snecma puts Silvercrest engine to test". AINonline.com. Retrieved 2013-07-22.
  2. ^ "ENGINES SPECIAL REPORT: SNECM". "EVA INTERNATIONAL MEDIA LTD". 2014. Retrieved 2015-02-10.
  3. ^ "SILVERCREST: a new name in propulsion for business aviation". SAFRAN. 2006-10-17. Retrieved 2013-07-24.
  4. ^ a b John Morris (October 17, 2006). "Snecma Launches Its Silvercrest Engine". ShowNews NBAA 2006. Aviation Week. p. 78. Retrieved 2013-07-23.
  5. ^ Jeff Apter (2006-11-30). "Snecma develops new bizav engine". AINonline. Retrieved 2013-07-23.
  6. ^ "Snecma Announces Silvercrest Core demonstrator First Parts Delivered". SAFRAN. 2007-05-22. Retrieved 2013-07-24.
  7. ^ a b "Safran Reveals Revised Silvercrest Test Plan". Aviation Week. November 1, 2016.
  8. ^ a b c d e Thierry Dubois (2007-05-22). "Snecma Silvercrest core engine set for first run". AINonline.com. Retrieved 2013-07-24.
  9. ^ Thierry Dubois (2007-04-30). "Snecma Silvercrest core to run later this year". AINonline.com. Retrieved 2013-07-24.
  10. ^ Thierry Dubois (2008-05-20). "Snecma Silvercrest engine completes core tests". Retrieved 2013-07-24.
  11. ^ Ian Goold (2013-05-20). "Snecma Close To Second Application For Silvercrest". AINonline. Retrieved 2013-07-22.
  12. ^ Dominic Perry (23 May 2013). "EBACE: Snecma eyes maiden Silvercrest sortie in fourth quarter". Flightglobal. Retrieved 2013-07-23.
  13. ^ Thierry Dubois (2014-07-15). "Snecma Begins Flight-testing Silvercrest on Modified Gulfstream II". AINonline.com. Retrieved 2014-07-17.
  14. ^ "Snecma Silvercrest Schedule Slips into 2016". AINonline.com. 2015-03-12. Retrieved 2016-07-31.
  15. ^ "Silvercrest, an innovative new bizjet engine". 2007-06-20. Retrieved 2008-01-12. [dead link‍]
  16. ^ "Cessna selects engine, avionics and fly-by-wire suppliers for the latest in its large-cabin Citation business jet family" (Press release). Textron Aviation. October 31, 2016.
  17. ^ "NBAA : Dassault lance le Falcon 5X" (in French). Air&Cosmos. Retrieved 2013-10-24.
  18. ^ "Dassault confirms two-year delay for 5X". flightglobal.com. 2016-01-29. Retrieved 2016-01-29.
  19. ^ "Silvercrest 2D for the Dassault Aviation Falcon 5X". Safran Aircraft Engines.
  20. ^ a b "Snecma's Silvercrest To Power New Falcon Jet". Aviation International News. October 22, 2013.
  21. ^ "New Aircraft Concepts for Improved Environmental and Energetic Efficiency" (PDF). Técnico Lisboa. November 2014.
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