Abstract: A fin-stabilized mortar grenade has an ogival shell body, a tail tube with finned controlling surfaces. The shell body has at least one annular groove located with the limits of the caliber diameter zone. A spreadable sealing ring is disposed in the annular groove. The sealing ring has an edge bevel located at the edge facing the shell body at the bottom of the annular groove. The bevel edge configuration provides a mechanism by which the force of propellant gases enhances the radial spreading of the sealing ring outwardly against the inside surface of the barrel from which the mortar grenade is fired.

Abstract: A shell body for fin-stabilized projectiles has an ogival curvature and is composed of two body sections. A front body section has a cylindrical bore extending therethrough and a rear body portion has a cavity therein. A headpiece containing a fuse is connected to the front end of the front body section and a tail tube with a fin-stabilizer unit is connected to the rear of the rear body section.

Abstract: The fin-stabilized projectile has an ogival projectile body having a nose portion and a base portion joined to a tail tube having a finned tailed unit. The nose and base portions are fixedly secured to respective ends of an internal connecting tube. The tube has a plurality of recesses disposed around the peripheral outer surface of the internal connecting tube. A bursting charge is formed along the outer peripheral surface of the connecting tube and the material used to form the bursting charge fills the recesses to provide a distribution of thrust forces along the length of the bursting charge, which is disposed between the nose and base portions.