I have flown Ducted Fans for many years. I used BVM, Dynamax, Turbax, and Ramtec. The Turbax is not close to the performance of the Dynamax or Ramtec. BVM is in a class of its own, both in price and performance.

Let me stick with your original question regarding the Dynamax. The K&B 82 and OS 91 operate the Dynamax unit just fine. There is no need to remove every other stator for operation. I have tried it both ways and didn't experience any significant performance change.

I'm not an aircraft designer, however, I measured the intake and exhause diameters of two of my old ducted fan jets in my shop. The intake areas average 22 square inches. The exhaust diameter is 3 5/8 inches. I think you will find this combination works great.

Hope this helps,
Greg