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I'm attempting to calculate the difference in thrust in a secondary propeller operating in the wake behind a primary propeller, in the context of a trailing quad-copter following a leading quad-copter in close proximity.

I'm using the model from Propeller Slipstream Model for Small Unmanned Aerial Vehicles and have so far simply linearly superimposed two of the induced velocity fields on top of one another, as far as I am aware a linear superposition should give a reasonably accurate induced velocity field for now.

I'm wondering if there is a way to calculate the thrust a propeller is creating just from this induced velocity field. I should also note that the thrust the propeller generates is one of the input variables into the model, so I am assuming that I will need to work out how much additional thrust the second propeller requires to give the flow field generated

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