Linearvelocity doesn't work when some parts are welded together

Hello, I’m trying to script an airplane for my game and I want to use constraint movers to do the physics aspect of it. I want to use linearvelocity because vectorforces didn’t work out for me. However, I found that when certain parts in my model are welded together, the linearvelocity does not move the plane at all no matter the maximum force nor vector velocity values. Even with max force of 0, the model assembly will float midair. However, everything works fine when I don’t weld certain parts of the plane, ex if it’s just the seat. I’ve checked all my parts and none of them are anchored so I don’t know why this is happening.

Video showing plane not moving with linearvelocity at all:

Video showing seat by itself moving fine:

Image showing that none of the parts are anchored in the model

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try making its force higher and making sure that all parts are unanchored and not being connected to anchored surfaces.