After finally managing to get me some basic tools, I started to build rc-planes again. The first try was a small only-wing hang-glider (similar to “Little Plank”).
After a test flight at the “Grüner Heiner” it turned out that the vertical stabiliser is quite a bit too small. But the trim calculations were pretty well and it flew right out of my hand, no further trim needed.
Now I’m planning the successor with a bigger vertical fin and a longer and stronger nose (after a few hard landings the nose broke off).