- Bristol Orion
The Bristol Orion aeroengine was a 2 shaft turboprop intended for later marks of the
Bristol Britannia andCanadair CL-44 . Although the engine was built and underwent a development program, around 1959 the project was cancelled by the BritishMinistry of Supply . At that time, interest in turboprop powered aircraft was beginning to wane, because of the successful introduction of theBoeing 707 andDouglas DC-8 jetliners into airline service.A single stage HP turbine drove a 5 stage all-axial HP compressor, whilst a 3 stage LP turbine drove both the 7 stage LP compressor and the propeller, via a reduction gearbox. Thus the Orion used a shared load LP turbine (like the
Rolls-Royce Tyne ), whereas its predecessor, theBristol Proteus , had a free-power turbine. The combustor used separateflame can s.One novel feature of the Orion was a derate from a thermodynamic rating of 9,000 shp at sea level, to enable a constant 5,150 ehp power level to be maintained all the way up to 15,000 ft altitude.
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