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A gas turbine engine arrangement comprises a core engine, a power turbine and a propulsor. The core engine comprises at least one compressor and at least one turbine arranged to drive the at least one compressor and the core engine is arranged in a casing. The power turbine is positioned downstream

A gas turbine engine arrangement comprises a core engine, a power turbine and a propulsor. The core engine comprises at least one compressor and at least one turbine arranged to drive the at least one compressor and the core engine is arranged in a casing. The power turbine is positioned downstream of the at least one turbine and the power turbine is arranged to drive the propulsor. An electrical machine is arranged upstream of the at least one compressor. The electrical machine comprises a stator and a rotor and the electrical machine comprises a motor/generator. A first clutch selectively connects the rotor of the electrical machine to the power turbine and a second clutch selectively connects the rotor of the electrical machine to the at least one compressor of the core engine.

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1. A gas turbine engine apparatus comprising: a core engine arranged in a casing, said core engine having a propulsor, a compressor, a first turbine arranged to drive said compressor, and a power turbine positioned downstream of the first turbine, arranged to drive the propulsor;a stator and a rotor

1. A gas turbine engine apparatus comprising: a core engine arranged in a casing, said core engine having a propulsor, a compressor, a first turbine arranged to drive said compressor, and a power turbine positioned downstream of the first turbine, arranged to drive the propulsor;a stator and a rotor arranged upstream of the compressor and configured as a motor/generator;a first clutch operable to selectively connect the rotor of the motor/generator to the power turbine for acting as a generator; anda second clutch operable to selectively connect the rotor of the motor/generator to the compressor for acting as a motor;said first and second clutches operable together to connect the compressor to the power turbine via the rotor of the motor/generator for windmilling and/or power sharing. 2. A gas turbine engine apparatus as claimed in claim 1 wherein the motor/generator is arranged coaxially with the core engine, the power turbine and the propulsor. 3. A gas turbine engine apparatus as claimed in claim 1 wherein the nose cone is secured to the casing. 4. A gas turbine engine apparatus as claimed in claim 3 wherein the motor/generator stator is secured to the nose cone or the core engine casing. 5. A gas turbine engine apparatus as claimed in claim 1 wherein the propulsor is arranged downstream of the at least one turbine. 6. A gas turbine engine apparatus as claimed in claim 1 wherein the propulsor is arranged upstream of the at least one compressor. 7. A gas turbine engine apparatus as claimed in claim 6 wherein the motor/generator stator is secured to the core engine casing. 8. A gas turbine engine apparatus as claimed in claim 1 wherein the propulsor is selected from the group comprising a propeller and a fan. 9. A gas turbine engine apparatus as claimed in claim 1 wherein the first clutch is selected from the group comprising a dog clutch, a friction clutch, an electromagnetic clutch, a rheological clutch and a fluidic clutch. 10. A gas turbine engine apparatus as claimed in claim 1 wherein the second clutch is selected from the group comprising a dog clutch, a friction clutch, an electromagnetic clutch, a rheological clutch and a fluidic clutch. 11. A gas turbine engine apparatus as claimed in claim 1 wherein the first clutch and/or the second clutch is a variable clutch to allow transfer of power between the power turbine and the at least one compressor. 12. A gas turbine engine apparatus as claimed in claim 1 wherein the core engine comprises a low-pressure compressor, a high-pressure compressor, a high-pressure turbine arranged to drive the high-pressure compressor and a low-pressure turbine arranged to drive the low-pressure compressor. 13. A gas turbine engine as claimed in claim 1, wherein the rotor, the stator, the first clutch, and the second clutch are arranged within a nose cone of the gas turbine engine, said nose cone disposed upstream of the compressor. 14. A gas turbine engine as claimed in claim 1, wherein the motor/generator stator is secured to the core engine casing.