Thank you all,
This was the second flight, but it was quite balanced from the beginning, I think the real plane was flying very well too. I have been building this way since 2008. More details on the style of construction can be found on the Romanian forum:
semimachete din depron&hartie - Modelism - RHC Forum - Pagina 17 and video with the flights:
https://www.youtube.com/user/mantraro/videos
Rata - the "bump and go" was not intended, it was a wrong approach to landing. Fortunately, the engine has 800W and has taken me out of trouble .
Teo