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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, the engine was originally designed as an 8,500- to 10,500-pound thrust turbofan 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. 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 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.〔 Turbomeca, which like Snecma is a part of the SAFRAN Group, participates in the design of the centrifugal compressor stage.〔 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.〔 At an early stage of the project, the overall pressure ratio was 27:1 with a core pressure ratio of "over 17". 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.〔 While a full engine demonstrator was due to run towards the end of 2008, the FETT (First Engine To Test) started ground-based testing in September 2012.〔 After a 6+ month delay, the in-flight tests started mid-2014 on a Grumman Gulfstream II and should take place in Istres. Engine certification, originally pencilled in for the end of 2010 or early 2011,〔 has been re-scheduled for the first half of 2016. Availability was planned towards 2012.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Snecma Silvercrest」の詳細全文を読む スポンサード リンク
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