Yes, there has been a lot of progress. I will be building a large unit soon, but I have to wait until funds become available. Throughout the thread discussion, the formula below describes roughly how much thrust can be produced.Interesting discussion! Any progress since September 2014, blainiac? :)
The thrust is in N, pressure is in Pa (N/m^2), rho is air density, theta is the angle for each blade from the root. I will post more when I can. I have written a Navier-Stokes fluid simulation to refine some aspects, but it's complicated. PM me for more details.
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