I want you to help me with this because ..
Because he's flying badly, very bad.
I want you to somehow make him fly less, minimizing the design so that it weighs no more than ~ 1500 kg, and its speed does not exceed 260 km / h.
Just want it to be realistic.
At first, I somehow thought that I would go out, but I saw the real speed and doubted that everything would turn out, and nothing happened.

Here it is link

I would be glad if you could help me.
Thanks for the pleasure. :)