So i started to make a nice WWII fighter aircraft and i made the shape. When i added wings (width scaled to 0.1) it was incredibly unstable. COM, COL and COT are in the right position and it has the right wing loading. Also, the landing gear only retracts to 45 degrees, even though i have collisions turned off. Any ideas?
https://www.simpleplanes.com/a/nH3vAu/WWII-fighter-broken
I'd say make horizontal and vertical stabilizers bigger, check and see if the drag has glitched out EX: right wing has tons of drag while the left one doesn't have any. And possibly add nose weight as a nose heavy plane is better than a tail heavy one.
clicky link to plane mentioned