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It is all in the title.

I'm interested in power absorbed/used for a given thrust, or thrust generated for a given power (same diameters of course).

Just thrust and power. Ignore materials, electric vs turbine, complexity of the contra-rotating mechanism, etc.

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Undisturbed inlet flow provides the highest efficiency.

  • The single rotor with stator has a straightforward inflow; outflow will have a tangential component which is lost for thrust generation. The stator will bend the outflow back in the axial direction, but there still remain pressure increases with blade passing frequency.
  • The contra rotating rotor has one of the rotors in the disturbed flow of the first rotor - this second rotor will therefore have lower efficiency in transforming engine power into thrust.
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