After a couple unsucessful flights, my modified FT simple cub finally flew.
I didn't feel very confident after two failed attempts (first one the motor disconnected and it fell on the sea, second time it was tail heavy and got stuck on a tree), so this time a more experienced pilot handled the TX.
Anyway... He said it reacts heavily on commands, so it's better to fly using ~60% rates. It glides well (1:12 until 1:19 the motor was cut off for a quick glide test), but apparently has a more aggresive stall compared to my RC carbon cub (another foamie, but a kit I bought).
Had to use a 2200mah 3s battery + 4 fishing weights to get the CG correct. It should weight around 720g. I'll put it on a scale soon and check that.
Btw, I know the FT design has ~420g, but this one has a 10cm wider wing. Probably not enough, so I'll try to cut some weight off.
Enjoy the maiden flight.