Keesje
I've followed your work and think highly of it. With respect I'd like to play Devil's advocate for a moment. Your attention to detail is impressive, and you innovate on the fly, a very admirable quality in design. Let me ask you a couple simple and sincere questions. The Hercules is approaching sixty years of age, yet is present in large numbers, relied upon by both military and civilian owners, and has a pedigree and fact sheet that remains unequalled in many ways. Would you discuss by way of affirming your approach the need for wildly complex "improvements" and "tweaks" when an airframe of the 130's record of performance stands alone? Imagine 13k horsepower per side and fans you propose on an airframe that can be configured to carry ~250 pax (or more) transcontinental? A Twin Herc? Again, this is what if? To further Frame your work, if you will.
Airfoil