@AfterShock then use mod and slow down the engine, i mean make the jet engine slower

Yeah I know all that I was trying to fix it without changing the design too much @LeoTanaka2243

i know why.
because the COL it too front from COM so it will tilt back so hard
the COM should be LITTLE back from COL
so if you can mod the parts, add more weight to front to adjust COM.
OR
put more wing at back to make COL more back

the most important thing is that COM should be Little back then COL

if you need help tell me
by defualt press space to see COM - center of mass, COL - center of lift, COT - center of thrust

https://www.simpleplanes.com/a/A12x74/Space-ship Here u go

I'll Try!

Ok I'm done making it fly

I'll give it a spotlight so more people can see and hopefully help.

Im gonna help!