It is immediately below the rear ends of the tubes. j. automatically by the top lug when a weapon is being loaded, but it must be lifted by hand before the weapon can be withdrawn from the tube. Each valve is housed in a vertical cylindrical casting having a boss and quadrant to take a hand lever, and also a bracket to secure the unit to a panel. The vent valve is located in a pipe leading from the tube to the bilge. NOTE Always operate the S.S.E. 12-58 tubes: 1. The devices described here-in are designed expressly to confuse and disrupt enemy underwater echo ranging by producing, through chemical action, a large cloud of finely divided hydrogen bubbles which return an echo of the same order of magnitude as that returned by a submarine. For these to be handled as efficiently as possible in the space available hydraulic powered equipment has been provided to assist in loading and handling of the weapons. Three different types of Mk. (i) The top stop operating shaft rotates. FALSE TARGET, SUBMARINE MK. Each strap comprises two half-straps joined with a bottle screw, for which a special spanner like a carpenter's brace is provided. At the after end of the compartment and in line with the torpedo tubes are two sets of loading gear, one for the port, and one for the starboard loading positions. Both British and USN. is re seated by its spring and by pressure Both the rear-end and connecting flange sections have the same internal diameter as the tube section. A handwheel some distance forward of the tube is connected to the outer end of the input shaft by rods that are linked with universal couplings covered with grease-filled rubber sleeves. Each of these must also be fitted with one pair of large rollers before they are used for Mk. If no further launching is intended, secure the ejector. Nos. b. When the lithium hydride contents of this device come in contact with water, hydrogen is generated almost immediately and in large volume. motor and the underside of the differential valve, so that when the pressure in the chamber is sufficient, the A.I.V. Check the flap valve shut and operate the drain to ensure the ejector is dry. Two valve boxes are secured together by long studs and nuts. The barrel is long enough to accommodate any store presently supplied for use in. In addition to errors we have attempted to preserve from the original, this text was captured by a combination of optical character recognition and human typist. e. Shut the breech and report "Forward S.S.E. by a water non-return valve (W.N.R.V.). f. and g. on a panel near the tube. Can be ejected by air or ram down to 625 feet and gives off white smoke and a bright flame which lasts a minimum of 5 minutes. Presently (1974) only USN types are in use. f. A hand starting valve motor, which actuates and opens g. when supplied with air. Air passes to the disconnect switch motor and trips the disconnect switch. The model fitted is the MX 4 1B. in diameter. The keel block is used to support and guide the bottom bearer strips of the torpedoes; it is of U-section aluminum-alloy bar and must be secured to the after transverse frame of its tray by means of a drop-nose pin. a. unit, and also provides a constant impulse pressure for discharge. approximately 2,400 gals. 37 The fuse then ignites the central pellet which fires the propellant charge in the base of the grenade cup. At a depth of 5 to 6 ft. below the surface of the Ovate the inner valve spring overcomes the water pressure and unseats the valve, thus permitting seawater to enter the cavity and energize the batteries, the electrical output of which ignites the squibs. Folks, C.F. Evacuate compt: until after the grenade has been heard to fire. bore with a drain plug screwed into the lowest part of the blow valve interconnection pipe. C $2.99. To fire the torpedo, the H.F.V. These two tanks are entirely separate. b. L.P. air enters the aux S.F.V. a. d. Shut the breech, ensure the locking pin engaged and screw the breech up firmly. One is positioned near the top, the other near the bottom of the barrel. The seal bears against the lip-end face when the stern cap is shut. Hand levers for the stowage position stops are fitted to the underside faces of the trolley paths, outboard of their stops. thick stiffening ring is welded around the middle. 7 CARRIER, MESSAGE AND FLUORESCEIN M4-(FIG 12-58. Preserving trim by admitting enough water into the submarine thus compensating for the negative buoyancy of a discharged weapon. When a torpedo tube is flooded, water is prevented from entering the body of its L.F.V. 7. The free length of chain hanging from the sprocket emerges vertically from the crosshead and enters and coils into a chain case below. The delay fuse ensures that the candle has time to steady on the surface before the ignition of the main pyrotechnic composition. Seawater pressure acting on the diaphragm in the firing mechanism prevents the strikers, from going forward. The Oberon class was a 27-boat class of British-built diesel-electric submarines based on the successful British Porpoise-class submarine. e. Valve No 4, firing control valve Each assembly consists of a steel block containing a rotary faced valve operated by a hand lever. They engage automatically but must be withdrawn by pulling hand levers at the inboard ends of the paths. inboard and outboard. 37 torpedoes. d. Air passes from the compensating unit needle valve to the capacity chamber. The handle can thus be used for lifting tie top stop or spring catch, or for shaking them up occasionally. Attached to the bowcap is a shutter that seals the rectangular opening in the bow for streamlining and opens with the bowcap to allow a torpedo to be fired. The design of the castings that connect the hot run valves to the tube blow valves, and of the valve bodies, provides a seperate continuous channel with the two branches between each pair of valves. When in use they are locked on their trolley paths, in either stowage or loading positions, by means of latch-operated bolts which are attached to their undersides and engage in 'stowage' slots cut in the edges of the trolley paths. Two T.O.T. internal diameter. At present all stores are suitable for air discharge only and therefore the ram feature is not normally used. 22), green valve motor and shuts the A.I.V. Each set of tubes, port and starboard, is connected to its TOT by a tube drain system that serves tor both flooding and draining the tubes. 108; the backhaul is secured between the eye of the loading bar and the triangular link of the strops, with its free-end running from aft to forward; the shackle-end of the 36-ft. long loading pendant extends through the removable pulley of one clamp and is anchored to the eye of the other; the bight of the pendant extends forward and around the pulleys of the loading bar crosshead; and the free-end of the pendant runs from aft to forward. For securing the trolley in any desired athwartships position, a locking device is fitted to its underside. d. The piston is forced against its spigot by its spring. This has three eyes, one for the lifting pin, one for the embarking pendant shackle-pin, and one for the pin of a lifting press wire shackle. They extend through these holes into braking slots and thus enable the latch-operated bolts to be withdrawn without freeing the trolleys. valve motor. f. Remove all unnecessary gear from the Torpedo Compartment. b. The link mechanism opens or shuts a quick acting stop valve fitted in the firing system air line. In addition it allows the L.P. air to pass to a capacity chamber, via a differential valve and a compensating unit. To blow down the tube the TOT is put to vent, the main drain and blow down valve are opened. 45 ft. of 1 3/4 in. For flooding a tube, the tube vent and main drain are opened. A stop Remove the metal spacer and the coil springy from their respective positions within the cal. diameter stainless-steel bolt and is fitted in the after housing of the stop box. brackets near the after end of the compartment. a. motor and an impulse cut-off (I.C.O.) Although the remote indicator is convenient, the operating shaft pointer should always be considered as the only reliable indicator. The six forward tubes are the "wet slack fit" type and can be flooded, equalized and operated down to full diving depth. weapon by a loading bar and is winched by a drum. The ram rod is positioned in the centre of the breech where it is sealed by an "O" seal. This top plate is fitted to accept the connecting rod whit is in turn attached to a crosshead and operating shaft. Each torpedo tube comprises two lengths, namely inboard and outboard lengths. The winch can lift 1 ton 7 cwt. g. A hand starting valve (HSV) which, when open supplies h. h. A tube disconnect switch motor (T.D.S. This gas ignites on contact with air giving a bright flame and heavy white smoke. Adjacent to the heads and feet of the stowage brackets are anchor brackets for flexible steel securing straps, which are used to secure the reload torpedoes in the stowages. These are mounted on a shaft on the top centre line of the tube within the ballast tank and are contained in a pressure tight top stop and catch box. and proof test-pressure of 4500 lb/sq in. of a button on the after end of the torpedo, while the clamping pin is forced Suitable for Ages 14 & Older. They extend from the. Open the breech and sight the bore clear. in. is not airtight. Drain the tubes into a tank inside the submarine after firing so that trim is maintained; and the rear doors can be opened. The portable types are braced by stays pinned to them, and are secured to pads on the casing and pressure hull by vice-headed bolts. d. When loading a weapon into its tube, the first movement of lifting the spring catch and loading against the top stop must be performed with great care to prevent damaging the top stop. A framework is secured to the inboard end of each stern cap ram housing and carries a link mechanism operated by the stern cap operating shaft. The latch in the cotter-pin locked forward position secures the guide shoe, and the safety cotter-pins prevent accidental tripping of the latch. 5. (ii) The exhaust channel in the aux. When in use it is secured with a drop-nose pin to a lug on the after face of a trolley on the trolley path at Fr. Rollers fitted on either side of the bank run on the embarking rails and take the weight of the weapon as it is embarked. c. The A.I.V. Crack the individual tube vent on the nine valve chest to relieve any air pressure in the tube, then shut it. 12-44 No 2 valve is moved to the vent position at the same time and vents the barrel from the top, through the hull joint, through the vent ports of valve No 2 and into the bilge. Their operating mechanism is contained in an operating box secured to a pad on the top of the tube, just abaft the dome bulkhead. On ejection the device rises to the surface of the water where the squibs on firing ignite the expellant charge which separates the hydrostatic fuse from the aluminum tube and the expellant container from the piston. types are currently in use. This cam also prevents operation of valves 1, 2 and 3 until valve No 4 has been replaced after firing. The after edge forms a joint face for the rear door. The second roller is pinned to a bracket welded on the top centreline of the Torpedo Compartment, to guide the pendant clear of the pressure hull frames. to 4 by a method called 'Power Assisted Loading'. When the signal clears the ejector its movement through the water rotates the guide shoe to the rear, opening the shunt between the batteries and the squibs. Before the signal is loaded into the ejector and during its travel in the ejector barrel, the guide shoe serves to hold the shunt across the electrical circuits and secures the battery cavity against water entry.