Rolls-Royce Gem
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The Rolls-Royce Gem is a turboshaft engine developed specifically for the Westland Lynx helicopter in the 1970's. 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, it became the RS.360.
[edit] Overview
Its 3-shaft engine configuration is rather unusual for turboshaft/turboprop engines. Basic arrangement is a 4-stage axial compressor, driven by single stage IP (Intermediate Pressure) 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 2-stage free (power) turbine. A reverse flow combustor is featured.
The Gem 42 develops 1,000 shp at Take-off, Sea Level Static, ISA, but the Maximum Contingency Rating (MCR) is 1,120 shp.
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. The civil version, known as the CTS800, will power the AgustaWestland Super Lynx.
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