GarryB Tue May 26, 2015 1:21 pm
I have a question for anyone who could answer this (GarryB, Werewolf), in this video at '2:20' mark you see a 122 mm Grad warhead explode at an angle in the CGI graphic, is that some sort of directional fragmentation warhead? Usually you only hear about those kind of warheads in SAM missiles.
Very simply the video shows the problems of standard fragmentation warheads... a feature that has made howitzers and mortars more effective than guns for quite some time.
Very simply put the most efficient fragmentation area on a long slim aerodynamic projectile is its sides. Generally the nose is taken up by the fuse and the base has a very small area, so it is the sides of the round that most effectively fragment in a nice dense uniform pattern.
A high velocity round from a gun or a high velocity rocket means the round impacting the surface or being set off by a proximity fuse to achieve an air burst means one side of the projectile if facing down and one side is facing up so half the fragments are wasted.
A much lower velocity projectile from a mortar or a howitzer fired at very high elevations means the HE FRAG round comes in nearly vertically so the sides create a uniform dense pattern of fragments with no gaps.
This rocket design has a parachute to reduce its velocity (which is largely irrelevant for a HE FRAG warhead) but the direct effect is to change the angle of the projectile to near vertical which greatly improves the fragmentation pattern effect and makes the same warhead much more lethal.