In the film and television works, often can see the main character jump into the water, to avoid the enemy gun fire scene. The principle is that conventional bullets slow down quickly in the water and may not even penetrate a few feet. Recently, however, the Norwegian DSG has demonstrated a new type of munition that uses “supercavitation” to reduce underwater resistance — a target that is said to be able to concentrate 60 meters (200 feet) underwater , greatly expanding some of the most interesting mission capabilities.
(From: DSG, via New Atlas)
The “supercavitation” effect refers specifically to the design of wrapping underwater munitions in bubbles to significantly reduce frictional resistance.
Take the supercavitation torpedo, for example, it can achieve five times the speed of moving in the water of a normal torpedo. In addition, there have been applications in the ship propeller sontos and other fields, and even the future of ultra-fast submarines are being developed.
Despite being at odds with some people’s intuition, the supercavitation effect can be created by having a sharp, flat edge (lip) on the projectile.
This feature pushes water away and makes it ‘hard enough’ to leave a large bubble just enough for the ammunition to pass through, avoiding excessive side and rear-drag resistance.
For torpedoes, ships and submarines, the effect of the bubbles can also be enhanced by directing the exhaust gas to the end.
DSG said it had to turn to partners in the aerospace industry to find manufacturers that met the tolerances required for its CAV-X supercavitation bullet design.
From the company’s images, the warhead part of the new bullet has a round tip, and several special ridge-like designs. The end result is that the .50 bullet delivers a 60-meter precision strike (12.7 x 99mm NATO .50 rounds).
Although it moves much slower than land, it can still deliver a greater destructive force.
One of the bullets allows the submarine to strike targets 1,000 meters (3,280 feet) above the water at a depth of 5 meters (16.4 feet).
Another bullet allows helicopters to shoot from the air into the water, creating a greater threat to submarines, forcing each other to dive deeper into the sea to maintain a ‘safe distance’.