How do I calculate the thrust of ducted contrarotating propellers?

Is there any formula or website calculator or would it have to be done through experimenting with scale replicas?


This is one analysis that gives you information .

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Source : http://naca.central.cranfield.ac.uk/reports/arc/rm/2218.pdf

  • $\begingroup$ is there not a way to do this for just the motor, this equation involves drag of fuselage etc $\endgroup$
    – SRawes
    May 19 '17 at 16:19
  • $\begingroup$ Drag is included for the central portion of the propellor or have you got a new design that the propellors don't have a central mounting or drive point? $\endgroup$
    – Solar Mike
    May 20 '17 at 6:46

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