| 1. | Improved blade aerodynamics reduces the number of extra compressor stages required.
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| 2. | Fourteen compressor stages are required to deliver the required overall pressure ratio.
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| 3. | As of the Astazou X, the engine received a second axial compressor stage.
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| 4. | A difficulty first encountered with the Phoebus was with the first centrifugal compressor stage.
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| 5. | Most other turboshafts in this power bracket have a centrifugal unit as a final compressor stage.
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| 6. | The engine was long and in diameter, with eight compressor stages and a single turbine stage.
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| 7. | With eleven axial compressor stages and two turbine stages, it was only in diameter and weighed.
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| 8. | Later higher thrust versions of the CF34 feature an advanced technology core, with only 10 HP compressor stages.
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| 9. | Air from compressor stages is also used for heating of the fan, airframe anti-icing and for cabin heat.
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| 10. | There, it is reversed 180 deg and flows through a centrifugal compressor stage, the combustors and then the turbine stages.
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