Heya, I found a weird interaction between proc wings and MK2 expansion tricouplers. I got a "fix" for it, for anyone that encounters it. Linking the original post:   For search engine stuff: Phantom forces turning plane to the right/left even while on the runway and having no control input/thrust.   In hindsight, it happens even with normal bicouplers in stock, but the forces are only minimal and only bother when taking off/landing, the tricoupler got them way higher.