Rolls-Royce Gnome
From Wikipedia, the free encyclopedia
The Rolls-Royce Gnome is a single spool turboshaft originally developed by the de Havilland Engine Company as licence built General Electric T58 - a mid 1950s design.
The Gnome came to RR after their takeover of Bristol-Siddeley in 1966, Bristol having absorbed de Havilland engines in 1961.
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[edit] Construction
A 2 stage HP turbine drives the 10 stage all-axial compressor, whilst a single stage free power turbine drives the load. The combustor is annular. The engine was one of the first developed with an analogue computer as part of the fuel control system, specifically to control fuel flow during acceleration to prevent engine surge occurring.
[edit] Variants
- H 1000: 1,050 shp Westland Whirlwind (AgustaBell AB204B helicopter)
- H 1200: 1,250 shp Westland Whirlwind Series 60,[Westland Wessex](AgustaBell AB204B helicopter)
- H 1400: 1,400 shp Westland Sea King Agusta A.101
- H 1400-1: 1,660 shp Westland Sea King, Westland Commando
[edit] Specification
Performance data for the H1400-1 version, fitted to the Sea King Commando and Boeing Vertol 107 are as follows:
Take-off power 1535 shp
Airflow 13.8 lb/s
Overall Pressure Ratio 8.6
As a result of the low airflow and reasonably high overall pressure ratio, the blades at the rear of the compressor are extremely small.
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