Why does my craft accelerate for no reason?

Wait nvm I understand it now

wdym? Just connect the wing root to the main part of the plane/rocket instead of attaching it to a rotator then attaching it to the main body. The 'fuselage' is the main body area of the aircraft, not the wing. The wing and the fuselage are two different things. so:

ANY SIZE WING -> MAIN STRUCTURE = OK
.
SMALL WING -> ROTATOR -> MAIN STRUCTURE = OK
.
MEDIUM WING -> ROTATOR -> MAIN STRUCTURE = POSSIBLY UNSTABLE
.
LARGE WING -> ROTATOR -> MAIN STRUCTURE = UNSTABLE
.
ANY SIZE WING -> ROTATOR 1 -> ROTATOR 2 -> MAIN STRUCTURE = YOURE GOING TO BRAZIL

But quick question. Where is the fuselage on a giant wing?

Ok

If the wings are connected to the fuselage using hinge rotators or regular rotators, the plane will start accelerating like it got possessed. Just make sure the wing roots are connected to the fuselage directly and be sure to check if they're colliding with anything.

Is it caused by violent shaking?