Colombo

Thank you for your responses. p1t1o: I apologize, if I did not spelled it correctly. But I truly need to fly above 10k, somewhere around 20k, with basic engines, as missions require it. It is truly just to push it up, above 10k, for a while. I found that it can get easilly into spiral. Is there something that I can do to alleviate this? How I can know how many lift I need for my plane? (so if my wings are sufficient), is there mod that can visualize it? (so I wouldn't have to count that by hand). Thank you.

Hello, I am total noob in KSP. I am trying to build an early plane that could pump me higher than 10k meters with basic engines. However, it is highly unstable. So my question is: What is wrong with my plane? How could improve it? Thank you.