Abstract: A device for underwater missiles for use against submerged submarines, said missiles including a housing (1) having a front portion, intended to contact the outside surface of a submarine. According to the invention, a tubular ring member (6) is rotatably attached to the front portion of the housing (1), said ring member (6) being arranged to take up a rotary movement in relation to the housing (1) when contacting the outside surface of a submarine. In order to facilitate rapid acceleration of the ring member (6) into said rotary movement, the ring member (6) is attached to the housing (1) by means of a ball bearing joint (7) or any other known low-frictional rotary joint or connection, and the mass of the ring member (6) is also considerably smaller than the total mass of the missile. The outer surface(s) of the ring member (6) is/are also preferably arranged with means intended to increase the frictional contact between the ring member (6) and the outer surface of a submarine on impact, e.g.

Abstract: A projectile (1) containing particles of interference material is fired pneumatically from a launching tube (2). Compressed air, which is supplied to the launching tube and acts on the rear face of the projectile during firing, is conducted both to a loading chamber (19) wherein the air pressure is maintained even after the projectile has left the firing tube, and also via the loading chamber to an expansion chamber (20) in which, after a specific time-lag corresponding with a certain launch height on the trajectory of the projectile, an over-pressure builds up which causes the expansion of the chamber to be initiated with simultaneous expulsion of the interference material from the projectile. The compressed air may also be conducted to the chamber (10) in the projectile wherein the interference material is accommodated, tightly packed, in order to enhance the dispersion thereof.