By the late 1990s all nuclear anti-submarine weapons had been withdrawn from service by the United States, the United Kingdom, France, Russia and China. This bar is similar to that described in chapter 2 and shown in figure 4A. , The United States requested full working drawings of the device in March 1917. Other controls are either hydraulic or electric-hydraulic and may be operated either locally at the track or from a remote release station, such as the bridge or underwater battery plot or both. Most depth charges use high explosive charges and a fuze set to detonate the charge, typically at a specific depth. Depth Charge Release Track Mk 6 Mod 0, 20. Slide the detents clear of the detent shafts and remove the shafts. Maintenance and Lubrication. TOP OF DEPTH CHARGE PISTOL MARK 7 MOD, 1. All Rights Reserved. Another type of safety bar, the "Boston" type, may be installed. Figure 22.-Sequence of Operation, Depth Charge This alteration is made in accordance with BuOrd Dwg 424659. Approximately 4,000 torpedoes were produced, with 340 ultimately being deployed during the war. This mechanism releases a single charge overboard and allows the next charge to roll into the release position. The same minimum of maintenance is required for this track as for Mks 1, 4, and 5. These are for the purpose of removing safety forks and the knobs of pistol covers when depth charges are released. In-box reviews. The escapement arms and operating lever are secured to the escapement shaft by setscrews and locknuts. They carry only one or two depth charges which are retained in place by wire pendants. Stop and Safety Bars. Depth Charge Release Track Mk 4 Mod 0, 28.  The launching ship needed to clear the area at 11 knots to avoid damage, and the charge was seldom used. This is a list of Active Royal Navy weapon systems. This set of accesories are available in 1/72 and 1/48 scale. Depth Charge Release Control (Electric-Hydraulic) Mk 3 Mod 0-Schematic Wiring Diagram, 49. rails. Depth Charge Release Track Mk 5 may be installed with no alteration either. The modification of the outboard wiping plate is shown in Ordalt 2203. This category has the following 8 subcategories, out of 8 total. 7. The connecting rod bears against these stops in its secure and release positions. Mechanical Interlock Cams in Control Panel (Magnetic), 51. A depth charge is an anti-submarine warfare (ASW) weapon. The illustration shows the arrangement of the release control and after safety bar for a port track. These tracks are shipped assembled for either a port or starboard installation, and are so marked by the addition of P or S after the serial number. Depth Charge Release Track Mk 7 Mod 0, figure 28, is similar to the Mks 4 and 5, but is of steel construction and accommodates only two depth charges. Dimensions: When the charges have taken their new positions, the pawls will drop again and the track and depth charges are back in the positions of figure 10A. Either fixed or folding trays may be installed, depending upon the circumstances of the track installation. Later depth charges would be developed specifically for aerial use. They will accommodate all current 17.625-inch United States depth charges. Such trays are shown in figures 7 and 6 respectively. They were part of the wider Japanese Special Attack Units program. Depth Charge Release Track Mk 4 is now obsolete. Each of these is a welded assembly consisting of two vertical stanchions, an upper tie rod and an inverted channel lower cross member. The Japanese were unaware that the submarines could dive so deep. Each pair of pawls is bridged by a pawl bar, figure 14, to provide a. Mod 0 is approximately 159.5 inches long and accommodates eight 17.625-inch depth. A depth charge gas bubble expands to reach the pressure of the surrounding water. Stop and Safety Bars. Depth Charge Release Track Extension Mk 7 Mod 0, 40. It has been found that the lower tracks of Depth Charge Release Track Mk 7 have become distorted by the continuous pressure of depth charges against them, particularly under rough weather conditions. Lubrication Chart, Depth Charge Release Track Mk 3, 19. 7.  , A hydrostatic pistol actuated by water pressure at a pre-selected depth detonated the charge. Up to sixteen cycles of the secondary shock wave have been recorded in tests. The pendants are secured by a toggle pin or pelican hook arrangement which, when released, allows the charge to drop overboard. Remove the cotter pins from the retaining washers on the crank pin and the crank shaft. Unbolt the lower rails from all crosspieces and slide them outboard until their holes match the outboard set of holes in the crosspieces. The USSR, United States and United Kingdom developed anti-submarine weapons using nuclear warheads, sometimes referred to as "nuclear depth bombs". A similar idea was a 16 lb (7.3 kg) guncotton charge in a lanyarded can. This track is now obsolete. long. Diol Shields. They require positive pressure against them to make them lift when rolling a depth charge aft. When stowed, the tray is rotated into a vertical position, figure 7B, snug against the forward depth charge and its angle support drops down vertically. heavy weather. Depth charges have now largely been replaced by anti-submarine homing torpedoes. Ours fires by means of hydrostatic pressure, while the British utilize the seepage principle also."). Submarines or surface ships may be damaged if operating in the convergence zones of their own depth charge detonations. The angle support is secured in its stowed position by toggle pins, passed through "U" shaped brackets attached to the stanchions. When moving aft. It was the most advanced naval torpedo in the world at the time. Grease bearings in accordance with lubrication chart, figure 12, and apply preservative grease to exposed bearing surfaces. This topic is categorised under: Accessories » Bombs » Depth Charges. A number of charges may be stowed in the tracks in ready condition, instantly available for launching. They are often larger versions of the mortar used by infantry and fire a projectile in relatively the same manner. 11. Designs exist for shields to cover the after portions of the tracks and, at the request of the commanding officer, such shields may be installed by naval shipyards. The Depth Charges-page contains all related products, articles, books, walkarounds and plastic scale modeling projects dedicated to this bomb.  The Mark VII's 290 lb (130 kg) amatol charge was estimated to be capable of splitting a 7⁄8 inch (22 mm) submarine pressure hull at a distance of 20 ft (6.1 m), and forcing the submarine to surface at twice that. Depth Charge Release Track Mk 9 All Mods is designed to carry United States Depth Charges Mks 6 Mod 0, 8 Mod 0, 9 Mod 4, 14 Mod 0 and British Depth Charges Mk 7 and Mk 7 (heavy). To remedy the failure of this weapon, the Royal Navy's 450 lb (200 kg) Mark VII depth charge was modified for aerial use by the addition of a streamlined nose fairing and stabilising fins on the tail. The lower longitudinals consist of a channel and angle iron assembly with a small angle riveted inside each to form a track on which the depth charges rest. Clean detent shaft bearing surfaces with waste dipped in kerosene or carbon tetrachloride. These brackets permit the track to be demounted when the mine rails are in use. A7413.jpg, Short Sunderland ML824 depth charges at RAF Museum London Flickr 4607050181.jpg, Simsadus- London; The American navy in Europe (1920) (14580078878).jpg, Sunderland Depth charge detail, RAF Museum, Hendon. 10. eliminated. In "C," the track control unit has again been operated into the secure position, causing the escapement arms to clear the after pawl assembly. The device, which was developed by the Royal Navy, fired up to 24 spigot mortars ahead of a ship when attacking a U-boat. However, either assembly may be converted for use on the opposite side of the ship by reversing the release detent shafts, mounting the lever and bell crank on the opposite side of the track and placing the upper pawl and detent crank on the opposite side of the track. A folding loading tray of the type shown in figure 29 may be mounted on the forward end of the track to aid in loading depth charges. Local Control Mk 1, Hydraulic Control Mk 1 or Depth Charge Release Control (Electric-Hydraulic) Mk 3 Mod 0 may be used with Depth Charge Release Track Mk 3 All Mods and Mk 6. Channels connecting each pair of detents provide a continuous surface against which the depth charge rests when the detent is in the proper position. The effect of the secondary shock wave can be reinforced if another depth charge detonates on the other side of the hull in close time proximity to the first detonation, which is why depth charges are normally launched in pairs with different pre-set detonation depths. aftermost pair of stanchions, figure 4A, to prevent the loss of a depth charge from the release trap.
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