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Note: This is a sub-section of Rolls-Royce
The Clyde, or RB39, was Rolls-Royce's first purpose-designed turboprop engine. It 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.
The first versions produced 4,030 hp and were selected as the main engine of the Westland Wyvern strike aircraft, but the engine never entered full production as Rolls felt that pure-jets were the future. The Wyverns were instead fitted with the Armstrong Siddeley Motors Python.
The Rolls-Royce Dart, a much lower-powered engine otherwise similar to the Clyde did enter production, but Rolls generally ignored this success and left the market anyway.