First Thanks for answering my post .
Yet my thruster were added into component before I drag it into my graph, so I should miss something but what ?
The meshe is my pawn (an hovering vehicle) the only thing I know is to drag mesh on my graph and click GET or SET . How do I call an instance of this meshe ? (But I’m not sure that I should work with an instance in my case, mayby I should let the “get actor location”)