http://www.simpleplanes.com/a/K98WV3/Aircraft

should i post the aircraft?
@LieutenantSOT

@LieutenantSOT when it reaches high speeds on the ground the landing gears just get slammed to the ground

The CoL is the point the aircraft goes up from. If it is too far forwards, you spin out of control. If it is too far back, you would never take off (it would just push down on the front gear). You want it right nudged in the middle. And the CoM is the point the aircraft could be perfectly balanced on. You want it down, and ahead of the CoL. This makes it so it wants to go down, but it keeps going up anyways. Trim is what is used to fix it. NEVER use a gyroscope unless it is on a helicopter (even then... never use a gyroscope)

@lolry13 Hmm. Adding landing gear should fix it. You want the CoM slightly lower than the CoL

@LieutenantSOT heres a screenshot of the plane
https://snipboard.io/bSILgB.jpg

You need at least one, and what do you mean by "pitching down?" Is it a slow, progressive pitch, or is it a "spin out of control and hope you don't die?"

And that's your problem. Do you have any drag points?

@lolry13 The center of thrust does not matter

@LieutenantSOT ok

@lolry13 you have to click "reply" to tag me, I didn't know you responded

https://snipboard.io/OyKv8C.jpg
this is the center of lift mass and thrust

@edensk the only thing thats really sticking out is the cockpit and i have already disabled mass and dragscale using xml but it still happens

@lolry13 

if by pitching down you mean relative to the aircraft it could probably be drag if you have something big sticking out, but if it's relative to the ground then it's just how planes work

how do i post a screenshot?

ok

I'll try to help my best though!

Put a screenshot here. An explanation isn't enough.

It is likely your CoL, not the CoT