Rolls-Royce Corporation

Tim O'Hanrahan

Richard Geoffrey Stretton

A gas turbine engine comprising a planetary gear train, and a core engine casing. The gear train has a ratio of greater than approximately 3.0, with an input to the gear train being operatively connected to the compressor section, and an output from the gear train being operatively connected to the fan. The core engine casing encloses the compressor section and the turbine section. The fan has a diameter F, and the core engine casing has a diameter C. The core engine casing diameter C varies along an axial length of the core engine casing, and a ratio (C/F) of the core engine casing diameter C to the fan diameter F is within the range 0.2&#x3c;(C/F)&#x3c;0.4, along an axial length of the core engine casing.

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Bristol, United Kingdom

Tim O'Hanrahan