Very beautiful Timo,
I see you're in Switzerland, I am in Zurich. I've decided to build a ~1.5m Whirlwind for my next project, but it's a different league, I build in foam and measure my builds in months to your years. A bit like your combat models but XPS and a bit of foil and carbon.
I looked on "airfoiltools" at Selig 8052, but it looked like 23017 seemed already very good for retaining low reynolds' performance, just needs a different outboard airfoil for the very short tips. Anyway what do I know about airfoils with my hotwire 🙂 Do you plan single or twin batteries? Sorry if I missed it in all your posts.
Good luck with the maiden and thanks for the read
Ed.