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Rolls-Royce Clyde
The RB.39 Clyde was Rolls-Royce's first purpose-designed turboprop engine and the first turboprop engine to pass its civil and military type-tests.〔〔Flight 1954, p. 582.〕
==Design and development==
The Clyde used a two-spool design, with an axial compressor for the low-pressure section, and a single-sided centrifugal compressor as the high-pressure stage, running on concentric shafts.〔 The first versions produced 4,030 eshp and were selected as the main engine of the Westland Wyvern TF Mk.2 strike aircraft.〔
The Clyde was a long engine with the axial LP compressor in front of what was, in effect, a scaled down Derwent engine. Accessories were grouped around the axial compressor which conveniently narrowed towards the rear. Cooling for turbines and turbine bearings came from a small diffuser on the main shaft as well as tappings from the axial and centrifugal compressors. Testing of the development engines exceeded expectations with the engine soon being rated at 4,030 eshp. One problem un-earthed during testing was that damaging resonances emanated from the straight-cut spur gears in the reduction gearbox.〔
Despite the promising performance of the test engines Ernest Hives felt that pure-jets were the future and the Clyde programme was terminated, forcing Westlands to use the less than satisfactory Armstrong Siddeley Python on the production Wyverns.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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