Snecma Silvercrest

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Silvercrest
Snecma Silvercrest business jet engine PAS 2013 01.jpg
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]
Program cost US$ 500-600 million (2008 information)[3]

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

Development[edit]

The engine was announced at the 2006 National Business Aviation Association convention.[4] Certification was originally slated for the end of 2010 or early 2011.[5] In early 2008 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.[6]

The First Engine To Test started ground testing in September 2012.[1][7] In May 2013, in-flight tests were targeted for the fourth quarter of the year.[8] They finally started in July 2014 on a Grumman Gulfstream II and should take place in Istres-Le Tubé Air Base.[9] In 2015, engine certification was re-scheduled for late 2016.[10]

In November 2016, issues were traced to airflow through the engine not as controlled as expected, a side-effect of the axial-centrifugal high-pressure compressor selection, controlling software was adapted to maintain a steady airflow and active clearance controls were added to the low pressure turbine ; in May 2017, altitude tests should begin soon in Russia for an early 2018 certification.[11]

Design[edit]

It was originally designed as an 8,500–10,500 lbf (38–47 kN) thrust turbofan.[12] It should power super mid-size to large cabin business jets or 40 to 60-seat regional jets with a Maximum Takeoff Weight of 45,000 to 60,000 lb (20,000 to 27,000 kg).[13] In 2016 the thrust range was quoted as 10,000–12,000 lbf (44–53 kN).[14]

The two-shaft engine architecture includes a 42.5 in (108 cm) fan with solid wide-chord swept blades, followed by 4 booster stages, all driven by a 4-stage low pressure turbine. The high pressure 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 thrust range.[14] Turbomeca, which like Snecma is a part of the SAFRAN Group, participates in the design of the centrifugal compressor stage.[5]

Design in 2007 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, a 27:1 overall pressure ratio and a core pressure ratio of "over 17".[5][15]

Applications[edit]

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 on October 21, 2013, entry into service was delayed to 2020.[17]

Specifications (2D)[edit]

Side view

Data from Snecma.[18]

General characteristics

  • Type: axial and centrifugal flow, twin-shaft, bypass turbofan engine
  • Length: approx. 74 inches (1,900 mm)[5]
  • Diameter: 42.5 inches (1,080 mm) Fan
  • Dry weight: 2,290 lb (1,040 kg)[19]

Components

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

Performance

See also[edit]

Comparable engines
Related lists

References[edit]

  1. ^ a b c Thierry Dubois (31 Oct 2013). "Snecma puts Silvercrest engine to test". Aviation International News. 
  2. ^ "Engines special report: Snecma". Executive & VIP Aviation International. Summer 2014. 
  3. ^ "Snecma va investir 600 millions de dollars dans le Silvercrest". L'usine nouvelle (in French). 30 Jan 2008. 
  4. ^ "SILVERCREST: a new name in propulsion for business aviation". SAFRAN. 17 Oct 2006. 
  5. ^ a b c d Thierry Dubois (5 May 2007). "Snecma Silvercrest core engine set for first run". Aviation International News. 
  6. ^ Thierry Dubois (20 May 2008). "Snecma Silvercrest engine completes core tests". Aviation International News. 
  7. ^ Ian Goold (20 May 2013). "Snecma Close To Second Application For Silvercrest". Aviation International News. 
  8. ^ Dominic Perry (23 May 2013). "Snecma eyes maiden Silvercrest sortie in fourth quarter". Flightglobal. 
  9. ^ Thierry Dubois (15 Jul 2014). "Snecma Begins Flight-testing Silvercrest on Modified Gulfstream II". Aviation International News. 
  10. ^ "Snecma Silvercrest Schedule Slips into 2016". Aviation International News. 12 Mar 2015. 
  11. ^ Murdo Morrison (19 May 2017). "Rivals for power in the business aviation engine market". Flight Global. 
  12. ^ Jeff Apter (30 Nov 2006). "Snecma develops new bizav engine". Aviation International News. 
  13. ^ "Snecma Announces Silvercrest Core demonstrator First Parts Delivered". SAFRAN. 22 May 2007. 
  14. ^ a b "Safran Reveals Revised Silvercrest Test Plan". Aviation Week. November 1, 2016. 
  15. ^ Thierry Dubois (30 Apr 2007). "Snecma Silvercrest core to run later this year". Aviation International News. 
  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. ^ "Dassault confirms two-year delay for 5X". flightglobal.com. 2016-01-29. Retrieved 2016-01-29. 
  18. ^ "Silvercrest 2D for the Dassault Aviation Falcon 5X". Safran Aircraft Engines. 
  19. ^ a b "Snecma’s Silvercrest To Power New Falcon Jet". Aviation International News. October 22, 2013. 
  20. ^ "New Aircraft Concepts for Improved Environmental and Energetic Efficiency" (PDF). Técnico Lisboa. November 2014. 

External links[edit]