| 词条 | Rolls-Royce Gem | ||||||||||||||
| 释义 |
The Rolls-Royce Gem is a turboshaft engine developed specifically for the Westland Lynx helicopter in the 1970s. The design started off at de Havilland (hence the name starting with "G") and was passed to Bristol Siddeley as the BS.360. When Rolls-Royce bought out the latter in 1966, it became the RS.360.[1] Design and developmentThe Gem's three-shaft engine configuration is rather unusual for turboshaft/turboprop engines. Basic arrangement is a four-stage axial LP (Low Pressure) compressor, driven by a single stage LP turbine, supercharging a centrifugal HP (High Pressure) compressor, driven by a single stage HP turbine. Power is delivered to the load via a third shaft, connected to a two-stage free (power) turbine. A reverse flow combustor is featured.[2] The Gem 42 develops {{convert|1000|shp|abbr=on}} at Take-off, Sea Level Static, ISA, but the Maximum Contingency Rating (MCR) is {{convert|1120|shp|abbr=on}}. Until recently all versions of the Lynx have been Gem powered. However, now that Rolls-Royce own Allison, they have been marketing the more modern LHTEC T800, developed jointly with Honeywell. Applications
Engines on display
Specifications (Gem 42){{jetspecs|ref=Rolls-Royce[3] |type=Triple-shaft two-spool turboshaft |length= 43.4 in (1090 mm) |diameter= 23.5 in (590 mm) |weight=414 lb (187 kg) |compressor=4-stage axial LP, single-stage centrifugal HP |combustion= |turbine=2-stage power turbine, single-stage LP, single-stage HP |fueltype= |oilsystem= |power=1,000 shp (746 kW) |thrust= |compression=12:1 |aircon=7 lb/sec |turbinetemp= |fuelcon= |specfuelcon= |power/weight= |thrust/weight= }} See also{{aircontent|see also= |related= |similar aircraft= |lists=
|similar engines=
}} ReferencesNotes1. ^Gunston 1989, p. 155. 2. ^Rolls-Royce Gem product page 3. ^Rolls-Royce Gem 42 factsheet {{webarchive|url=https://web.archive.org/web/20101217024018/http://www.rolls-royce.com/Images/Gem_tcm92-6705.pdf |date=17 December 2010 }} www.rolls-royce.com. Retrieved: 16 July 2009 Bibliography{{refbegin}}
External links{{commons category}}
4 : Turboshaft engines 1970–1979|De Havilland aircraft engines|Rolls-Royce aircraft gas turbine engines|Mixed-compressor gas turbines |
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