Shooting from DP-64 "Nepryadva" is made from each of the barrels in turn. To reload the grenade launcher its breech leans down, and in the trunks laid grenades with a pre-set depth of the fuse from 0 to 40 meters. In the case of explosive FG-45 explosive ammunition under water, all living things are affected within 14 radius. Before the shot, the fuse located in the nose section of FG-45 is set to the required depth, then the explosion of the high-explosive part occurs at a predetermined depth.
At the same time, SG-45 ammunition is designed to illuminate and mark the place in which enemy swimmers were found. In SG-45 used mechanical fuse contact type. When a light grenade strikes a water, an expelling charge is triggered, which pushes a pyrotechnic torch out of SG-45. The torch floats on the surface and burns in a bright enough red color, illuminating everything around. The action of the signal grenade is 50 seconds.
The grenade launcher is equipped with a mechanical fuse; when the fuse is turned on, the trigger is blocked. The safety catch is located directly in front of the trigger guard. The DP-64 grenade launcher is equipped with a sectional sight with a 50 m division step. The sight mounted on the grenade launcher allows the gunner to fire both from closed positions along a hinged trajectory, as well as direct fire. The weight of the “Nepryadva” grenade launcher does not exceed 10 kg.
Grenade launcher DP-64 "Nepryadva" works on the principle of a dynamo-jet grenade launcher. The main part of the grenade launcher consists of thin-walled 2-x smooth barrels having a length of 600 mm and fixed in the breech, where they are fastened in the middle with the help of an aiming sleeve and a collar at the muzzle ends. The grenade launchers are locked with a bolt with a volume rubber butt pad on the shoulder rest. At the bottom of the barrel is the front handle, which serves to hold the grenade launcher when fired, as well as the rear handle with a trigger. At the top of the slide are the cocking and locking levers. The quadrant sight is located in the upper part of the sighting clutch on the left side.
The DP-64 grenade launcher has never been launched into mass production, but periodically it was produced in small batches to arm naval infantry units, crews of ship-cutters, some parts of the FSO, ship-cutters of the marine security service of the FSB border guard and PDSS units (anti-sabotage forces and means). Also given weapon offered for export, but information about its sale abroad is not available.
History creation and testing
The history of the creation of this grenade launcher dates back to the 1981 year, when the TsKIB SOO received the corresponding task to conduct research. Under the “Nepryadva” project, the 2 grenade launcher was to be developed: an 45-mm double-barreled active grenade launcher and an 50-mm active-reactive grenade launcher, of which only one was to remain. By the spring of 1983, prototypes of grenade launchers of both calibers were created: 45-mm for firing at a distance of up to 400 meters and 50-mm for firing at a distance of up to 1500 meters. By June 1983, they, together with ballistic installations, were sent for testing to Sevastopol.
During these tests, it was decided to stop work on the 50-mm grenade. Also, the sailors asked to exclude the carrying handle, which also served as a sight when shooting with a direct shot, from the design of the model samples. There were no other wishes and comments from the sailors. After that, there was a pause length of 2 year. TsKIB SOO was assigned to the development work on the Nepryadva project at the start of 1985.
By that time, a closed-type 45-mm double-barreled grenade launcher was approved for development. The operational and design documentation for prototypes and a number of devices was created. For example, rubberized brackets, which served to easily fix grenade launchers on the bulkheads of combat posts, as well as other places in which the watchman or other crew member, after finding a target in the water, could instantly unfasten the grenade launcher and use it for its intended purpose.
The vertical position of the grenade launchers made it possible to make the “Nepriavduda” fairly flat and very comfortable to carry around behind them, for example, during a march that soldiers and sailors had to make during the patrol of water bodies and the coast on foot. The use of the AKM belt when fastening it to the snapping at the muzzle and on the rubber butt body along the axis passing through the center of gravity proved to be quite a good solution, although it required a number of improvements.
Later, one of the grenade launchers was sent to Leningrad at the test site (Rzhevka), where tests were carried out and a conclusion was made on the recoil energy at the shot and the sound level. The sound when fired by a grenade launcher did not require the protection of the shooter’s ears, and the recoil energy was 45 J, which was below the permissible technical specification value - 59 J. Despite the fact that the actual recoil energy was higher than the permissible energy-measuring standards (35 J), firing from the grenade launcher, it was fairly easily transferred due to the implemented shot pattern and the presence of a shoulder rest with a perforated rubber butt pad. Night trials with going to sea have demonstrated that the DP-64 “Nepryadva” has a weak, non-masked and non-dazzling muzzle flame.
The first live firing from a grenade launcher, which indirectly proved the high effectiveness of its underwater striking action, turned out to be quite interesting. At the beginning of a series of shots, the first one from the ship’s board almost vertically into the water was accompanied by a crash of such strength that a laden KamAZ crashed into the side of a sea-going diving ship. After the shot to the deck, the midshipman immediately ran out, who began to shout: “What are you doing! You will tear all the pipelines to me! ” After that, the testers went to the stern of the ship and shot him "under the tail." Again the underwater explosion was accompanied by a terrible crash and the appearance of another midshipman on the deck, who shouted: “What are you doing! You will knock out my glands! ” Taking all this into account, the profession of a combat swimmer in these moments did not look attractive.
State tests of a grenade launcher were launched in October 1988 of the year in Sevastopol. The tests were accompanied by rather bad weather and were truly combat. After several days of fruitless waiting, the sea diving ship was forced to go for scheduled maintenance, and the testers had to go to sea on a small flat-bottomed trial vessel. October 12, when the tests of the complex began in the sea, the sea wave, according to experienced sailors, was already 5 points, while “Nepryavda” could be used for sea waves up to 4 points. However, there was nowhere to retreat, and the state commission gave the go-ahead to the beginning of the tests.
This time, the fire from the grenade launcher was not carried out by various commission members, but by the five selected Red Navy men, all of them with secondary technical education. During the briefing, they all grasped literally on the fly and only at the beginning, wearing a belt with a heavy grenade launcher around the neck (still 10 kg), politely, but quite expressively, moaned. At the same time, the sailors, having fired off a sufficient number of grenades in the conditions of a strong sea wave from a swinging deck, noted that they were not tired.
The tactics of combat use of the DP-64 grenade launcher suggested that in the event of an attack from the sea, loading one of the barrels with a SG-45 signal grenade, which was used to mark the target’s location on a water surface on which, as is known, there are no landmarks. The signal grenade was fired after receiving target designation of the range and course of the target. The grenade surfaced on the surface with a burning red torch, which was fired with high-explosive ammunition FG-45, periodically on the target again signal grenades were fired. Torches from SG-45 burned well even in the conditions of a storm. According to the results of these tests, the “Nepryadva” grenade launcher was commissioned by the Navy by order of 4 March 1990.
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