When you set physics to simulate, it is detaching the component from the root component of the actor (probably even if they’re already the root). It looks like all your non-physics based movements are applying to the actor itself, so the detached component just shrugs. When you start simulating physics, give the component the desired angular velocity. When you want to reset, turn physics off and set the transform of the component wherever it needs to go, and re-attach to root if necessary.