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