The Bristol Proteus was the Bristol Aeroplane Company's first successful gas-turbine engine design, a turboprop that delivered just over 4,000 hp (3,000 kW). The Proteus was a two spool, reverse-flow gas turbine, similar to the original Whittle engine designs with an extra turbine stage. Because the turbine stages of the inner spool drove no compressor stages, but only the propeller, this engine is sometimes classified as a free turbine. It was used mostly on the Bristol Britannia airliner, but saw some third party use as well.
Read more about Bristol Proteus: Design and Development
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