Physics based plane system works very weird

The topic is the same as the title.

I was making and trying so many times. And Elevation Looked to work a little But, There is a problem with turning. I think there is a problem with the coefficient or force-applying method.

The following link is the source code. You can download rbxlx file and test it.

Btw, I’m going to make it open source. tbh, I’m desperate. I will welcome what you answer.