Rolls-Royce Gem - Citizendia

Rolls-Royce Gem at the Midland Air Museum

The Rolls-Royce Gem is a turboshaft engine developed specifically for the Westland Lynx helicopter in the 1970's. The Midland Air Museum (MAM is situated just outside the village of Baginton in Warwickshire, England, and is adjacent to Coventry Airport. A turboshaft engine is a form of Gas turbine which is optimized to produce Shaft power, rather than Jet thrust. WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout History Since 400 AD Chinese children have played with bamboo flying toys. The design started off at de Havilland (hence the name starting with "G") and was passed to Bristol-Siddeley as the BS. The de Havilland Aircraft Company (less commonly spelled de Haviland was a British aviation manufacturer founded in 1920 when Airco, of which Geoffrey Bristol Siddeley was a British aero-engine manufacturer formed in 1959 from the merger of Bristol Aero Engines and Armstrong Siddeley Motors. 360. When Rolls-Royce bought-out the latter, it became the RS. 360.

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. WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout Honeywell ( is a major American multinational conglomerate company that produces a variety of consumer products engineering services and aerospace systems The civil version, known as the CTS800, will power the AgustaWestland Super Lynx.

Overview

see also