Abstract: An improvement in movable blast pipes for jet engines, including a fixed element joined to the engine, at the end of which fluid is ejected into a movable element pivotably mounted at the rear of the fixed element following an axis perpendicular to the longitudinal axis of said fixed element. On each side of the pivoting axis are arranged two pairs of guidance, two-way screw jacks whose bodies are mounted and joined to the movable element and include a sliding shaft joined with the middle portion of levers in turn joined at one of their ends to the movable element upstream from the junction point of the screw jacks, with the other end of the levers being joined to one end of rods whose other ends, in turn, are joined with the fixed element.