I know the interstellar space is not empty. It has (among micrometeorites and gas clouds) interstellar dust. And the effect otof the dust is more noticeable if the speed of the starship increases (we are talking here about speeds not faster than light). My wuestionquestion is: At which speed could an interstellar ship use the interstellar dust to maneuver through it with flaps and ailerons? (like a plane does with the air).