Snecma Silvercrest
| Silvercrest | |
|---|---|
| 300px | |
| 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 Snecma.
Contents
Design and development
Announced at the 2006 NBAA convention,[4][5] the engine was originally designed as an 8,500- to 10,500-pound thrust turbofan[6] 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.[7] Since original development the thrust range has been raised and is currently quoted as 9,500 to 12,000 pounds of thrust.
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]
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.[5][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 the first half of 2016.[14] Availability was planned towards 2012.[15]
Applications
- Silvercrest
- Cessna Citation Hemisphere, first flight 2019[16]
- Silvercrest SC-1D
- 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
General characteristics
- Type: axial and centrifugal flow, twin-shaft, bypass turbofan engine[8]
- Length: approx. 74 inches (1,900 mm)[8]
- Diameter: Fan: 42.5 inches (1,080 mm)[11]
- Dry weight:
Components
- Compressor: Low pressure: 1 axial fan + 4 axial stages, High pressure: 4 axial stages + 1 centrifugal stage[8]
- Turbine: Low pressure: 3 axial stages, High pressure: 1 axial stage[8]
Performance
- Maximum thrust: 9,500 to 12,000 lbf[7]
- Overall pressure ratio: 38.5[19]
- Bypass ratio: 5.9:1[20]
- Power-to-weight ratio:
See also
- Comparable engines
- Related lists
References
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- ↑ ((http://www.snecma.com/IMG/files/fiche_silvercret_ve_2013_vnbaa_hd_modulvoir_file_fr.pdf))
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