Hi,
I think we should simulate two unique propulsion systems.
One is known as prop-fan (https://en.wikipedia.org/wiki/Propfan) and it allows propeller airplanes to run at jet speed. One drawback to prop-fans is it's noise. I think we can reduce that by applying the "owl winglet," part of Ziehl-Abegg's "fe2owlet" industrial axial fan design. https://www.ziehl-abegg.com/us/en/produ ... /fe2owlet/
The second is called the Coanda thruster. It could be a very low-noise and fast engine. http://www.linux-host.org/energy/acoanda.html
Thanks.