and convex curved along the opposite side view c 39 shows a corresponding double convex curved wedge wherein both of the opposite sides of the wedge are convex curved and symmetrically arrayed about the horizontal plane view d shows still another shape for the wedge pieces of the disrupter device in which the base is flat while the opposing side comprises two angled planar surfaces oriented at different angles and intersecting along the line approximately midway between the point and the tail of the wedge view d 39 shows a corresponding shape which is symmetrical about its horizontal centerline the opposing sides each comprising two planar surfaces extending at different angles and intersecting at a line forward of the midway point between nose and tail it is not essential for the effective operation of arrangements in accordance with the present invention that the two bars comprising the disrupter device be parallel to each other fig8 is a schematic view looking in the direction of the horizontal axis 60 of the exhaust plume 58 with wedge bars 82 83 being non parallel to each other they are positioned on opposite sides of the centerline 60 in a position to completely intercept the exhaust flow 58 and effectively intersect with each other at a point 84 which may serve as the structure to which the bars 82 83 are mounted to a support arrangement fig9 shows another possible configuration wherein the wedges 92 93 are portions of a u shaped combination the wedges 92 93 being supported by the bottom portion.