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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?

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This is one analysis that gives you information .

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

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  • $\begingroup$ 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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