The high aspect ratio is required to keep induced drag low since I'm not going to go over 300kph anytime soon with this thing. And the wing loading is high because my climb has to take place at maximum L/D which means that climb Cl is about 0.8 and I'm designing for this L=Wcos(y). The thing that's concerning me is that I need to either supercharge or turbocharge this engine, otherwise maximum power would be about 50% (probably much less) at FL20. I was planning to turbocharge it myself since it gives a better performance curve than supercharging but the already supercharged engines on the market are an attractive option too.

The airfoil is NLF so drag is pretty low (about 0.07 at maxL/D) and I'm designing the airfram quite similar to the piaggio avanti 180, beautiful plane, probably 50% laminar flow or more. I'm changing the airfoil a bit since I'm flying at lower speed but I'm planning to use a pusher prop configuration with a T tail and no canards. The big elevator and rudder surfaces are a drawback but the reduction in drag is a big plus and a requirement in my low T/W ratio.

Hopefully that gives an idea of the design, I'm sure its full of holes but I'll plug them one by one and I'd very much appreciate any criticism or advise.