It provides illumination for about 60 seconds with 600,000 candlepower illumination. Increments removed from cartridges before firing should be placed in a metal or wooden container located outside the firing vehicle/position at least 25 meters away. Lock Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . This section discusses the characteristics and nomenclature of each component (Figure 4-2). I have included my order history, detailed photos, as well as my personal opinion on International Military Antiques, IMA -USA www.ima-usa.com 81mm Display Mortar that they have for sale. .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MTD: MULTIPLE CAL. In charge was the platoon commander - normally a lieutenant. Several types of HE ammunition are used in the 81-mm mortar, M252. REFERRING OF THE SIGHT AND REALIGNMENT OF AIMING POSTS USING M64 SIGHT. The increments are individually wrapped with waterproof bags that are not removed. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. Table 4-2. b. The mortar should be within two turns of center of traverse when the task is compete. Those cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. At this command, the squad proceeds as follows: a. All PD fuzes are superquick--detonate on impact. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. He uses the chain of command to assist him in effecting his command and supervising duties. .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. At the command, MARCH ORDER, the squad places the mortar, equipment, and ammunition in the squad vehicle and trailer. It is fitted with a standard pull wire and safety pin that are removed immediately before firing. An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. Barrel (with blast attenuator device) MFCS Dismounted. The gunner then kicks the barrel several times with his heel in an attempt to dislodge the round. HE ammunition is used against personnel and materiel. Before the mortar is mounted, the squad must perform premount checks. To dismount the mortar, the squad leader commands, OUT OF ACTION. 107 Army Pentagon The cartridge can be fitted with the M524-series, M526-series, M567, or M532 fuzes. If you look at the table above, you'll see that at 1.5km range, 120mm mortars have nearly 33% more dispersion than 80mm mortars.Try testing 80mm mortars and 120mm mortars at 1.5km against . The M375A3 cartridge is ballistically similar to the M374A3 (HE) cartridge. If the primer of the ignition cartridge is dented, the first ammunition bearer attempts to replace the safety wire and places the round in a marked, safe location for disposal by ordnance personnel. .50 MACHINE GUN, M55 AND MACHINE GUN, CAL. a. The gunner removes the sight and places it in the case with 3200 deflection and 0800 elevation indexed. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. It is assembled with the M772A1 MTSQ. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. The muzzle end has a short tapered lead-in which acts as a . The fuze is not intended to function at charge 0. The safety pull wire is removed just before inserting the cartridge into the mortar. He must not stand directly behind the mortar. a. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. With standard mortar, the maximum effective range is close to 4,000 metres; with a long-range system, this increases to nearly 4,500 metres. Ammunition Lot Number. He places the sight case and aiming posts to the left front of the mortar position. He indicates the initial direction of fire by pointing in that direction and commands ACTION. Burst Height. No tools are needed to set the fuze, and the setting can be changed several times without damaging the fuze. When set at delay, the fuze train causes a 0.05-second delay before functioning. 4-12. M327 mortar is an extended range mortar system operated by Marine Corps Artillery Units. a. A securing strap is attached to the plain leg for securing the bipod in the folded position. The fuze should already be fitted to the cartridge. The table on the right describes the three most common setups. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. The propellant increments are ignited, which produce rapidly expanding gases that force the cartridge from the barrel. A proximity fuze is an electronic device that detonates a projectile by means of radio waves sent out from a small radio set in the nose of the projectile. d. The gunner recovers the baseplate to the area designated by the squad leader. I say 120s are bad because they suffer from terrible dispersion even when not shooting at 6km. c. The assistant gunner lifts the bipod and stands it on its elevating leg so that the elevating handwheel is to the rear and the plain leg is to the front. Share sensitive information only on official, secure websites. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. (4) The leg-locking handwheel is hand tight. (1) The M772A1 fuze is a MTSQ. The vertical cross line of the sight is on the left edge of the aiming point. The gunner is given a deflection change between 5 and 25 mils, either increasing or decreasing from the last stated deflection, and the command to refer and realign aiming posts. The cartridge uses the M205 propelling charge and is assembled with the M567 or M524-series fuze. f. The open end of the socket must continue to point in the direction of fire. The M252 system . There is a selector on the lower shaft for non-delay or delay impact action. The settings are obtained from the range tables and are applied using a wrench (number 9239539) or a 1 3/4-turn open-end wrench. 4-11. 120mm IHE grenade DM91. DESCRIPTION. To make the shift, the gunner places the fingers of his right hand in the muzzle and his left hand on the left leg. The RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. M252 81mm Mortars The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. The M821/M889 are 81mm HE Mortar Cartridges. (2) Color code. A locked padlock LHMBC. The fuze consists of a brass head, body assembly, and expelling charge. Proximity (VT). Referring and realigning aiming posts ensure that all mortars are set on the same data. d. The squad leader supervises the squad drill and is responsible for supervising the laying out of the equipment as shown in Figure 4-6. Designed by Thingsym. Normally, it can be moved by hand, although this may be difficult to do if the mortar is moved through a large arc. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. The body is made of aluminum and brass. A .mil website belongs to an official government organization in the United States. Fired . The American M1 81mm Mortar, like the upcoming M2 60mm Mortar, was based on a French design by Edgar William Brandt (1880-1960). e. Care, Handling, and Preservation. Maximum Range (meters): 7,240 (with standard fuze) . End this starting train with not less than 1 meter of inert material (dry grass, leaves, or newspapers). He knocks down the near aiming post and proceeds to the far aiming post. While the assistant gunner supports the barrel, the gunner slackens the leg-locking handwheel, releases the locating catch, and positions the plain leg. For those of you in the market for a Dummy/Display 81mm mortar, I hope this article can answer a few of your questions before you order. (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay. Long Range PGK. On its right side, the clamp is recessed to receive the ball end of the locking rod. This section discusses the. An official website of the United States government. Red phosphorus rounds can be fired from the M29/M29A1 at a reduced charge (maximum charge = charge 2). Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. When the approximate alignment is completed, the gunner signals the assistant gunner to lower the bipod by pushing down on the mortar. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. The mortar is then re-laid on the aiming posts using the traversing crank. Dropping may cause the propellant charges to ignite, causing bodily injuries. M120/M121 120 mm Mortar. As soon as the sight data are announced, the gunner places it on the sight, lays the mortar for elevation, and traverses onto the aiming post by turning the traversing handwheel and adjusting nut in the same direction. If it is necessary to leave the ammunition uncovered, it should be raised on dunnage at least 6 inches above the ground. (a) Since the mortar is normally mounted in defilade, there could be a mask such as a hill, tree, building, or rise in the ground. However, since explosives are affected by moisture and high temperature, they must be protected. It can provide all-weather, ground-based, close supporting, accurate, immediately 81MM M252A1. The assistant gunner carries the bipod to the front of the barrel and places the bipod feet on the ground 12 to 15 inches in front of the baseplate and astride the line of fire. It is especially useful if the baseplate sinks deep into the ground during prolonged firing. The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. As soon as the sight data are announced, the gunner places it on the sight. M3A1 Baseplate (1) The barrel is clean and free from grease and oil both inside and out. If it gets wet or dirty, it must be wiped off at once. Both the 60mm and 120mm mortar rounds use White Phosphorus. The pile is covered with a double thickness of tarpaulin. At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. MC Medical Guide; Client-side mods; TFAR 1.x for players; The components of the mortar consist of a cannon, mount, and baseplate. The M819 cartridge (M252 only) has a cylindrical body and contains red phosphorus that produces white smoke on contact with air. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. They contain about 2.10 pounds of composition B explosive. e. The gunner centers the elevation bubble. The M751 is fitted with a smoke charge that operates on impact. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. The assistant gunner attempts to maintain the traversing mechanism on a horizontal plane. The ignition cartridge strikes the firing pin and detonates, which causes a flash that passes through the radial holes in the shaft. In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. More uniform firing is obtained if ammunition is kept at the same temperature. The first ammunition bearer puts both hands on the cooling fins under the barrel and slowly lifts the barrel until it is horizontal. e. The M362A1 and M362 HE cartridges are of steel forge construction and contain about 2.10 pounds of composition B explosive. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. He levels all bubbles. M64A1 Sightunit. REFER DEFLECTION TWO EIGHT SEVEN FIVE (2875), REALIGN AIMING POSTS. During training, the gunner may use the driving stake from the aiming post case. Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. b. high-explosive bomb at a range of about three miles. The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. The gunner checks the baseplate and ensures that--. If water is not available, the gunner must stand clear of the mortar until the barrel is cool. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. The round is still safe to handle and transport if the safety wire is reinserted. Red phosphorus/white phosphorus--M819 and M375-series. The enemy will use them. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. The obturating ring ensures equal muzzle velocities in hot or cold barrels by keeping all the gases in the barrel until the cartridge has fired. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. Then it is removed from the bipod and laid horizontally on the ground at the dud pit until it can be turned over to ordnance personnel. It is light enough to be portable when broken down into. (See FM 7-90 for a discussion of the duties of the platoon headquarters.). Excess increments should not accumulate near the mortar positions but are removed to a designated place of burning and destroyed. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. Complete cartridges are always handled with care. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the b. Tabulated data. When the gunner is satisfied with his sight picture he announces, "Up.". Attached to the right of the screw is the traversing handwheel. b. Baseplate placed against baseplate stake. a. This section contains information on how to prepare the 81-mm mortar, M252, for firing, how to conduct safety checks, and, if a misfire should occur during firing, what actions the crew applies to remove the cartridge from the barrel. The M1 was a derivative of the French mle 27/31 system (itself an improved form of the Stokes Trench Mortar of World War 1 fame) and slightly altered to suit American needs. 120MM Mortar System. It is set using the bladed end of the M18 fuze wrench. The squad leader notifies the FDC of the minimum mask clearance elevation. In the U.S. Army and U.S. Marine Corps, it is normally deployed in the mortar platoon of an infantry battalion. (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. After the barrel cools, the gunner removes the sight and firing pin. SMALL DEFLECTION AND ELEVATION CHANGES. Figure 4-4. Table 4-3. If not, the cartridge is placed on its side, and the closing plug is removed using an M18 fuze wrench. The M252 medium mortar offers a compromise between the light and heavy mortars. a. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. The removable increments are fitted onto or around the shaft, depending on their type. ), FIRING TABLES FOR, CANNON, 155MM, HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A4 AND CANNON, 155MM, HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A5 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A6 AND CANNON, 155MM, HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM, HOWITZER, XM776 ON HOWITZER, MEDIUM, TOWED, 155MM, XM777 FIRING PROJECTILE, HE, M795 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M284A2 CHROME ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777, M777A1 AND M777A2 AND CANNON, 155MM HOWITZER, M776 CHROME ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, SMOKE, WP, M1121 INCLUDES FIRING TABLES FOR PROPELLANTS: M119A2 (CHARGE 7R), M203A1 (CHARGE 8S), AND MODULAR ARTILLERY CHARGE SYSTEM (MACS) PROPELLANTS: M231 (CHARGES 1L AND 2L), M232 AND M232A1 (CHARGES 3H, 4H AND 5H) (S&I BY PROP SEE FOOTNOTES). The propelling charge is contained in four horseshoe-shaped, felt-fiber containers or nine wax-tested, cotton cloth, bag increments. Each squad member should be able to perform all the following premount checks: a. ) or https:// means youve safely connected to the .gov website. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. The gunner moves the mortar as the assistant gunner steadies it. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. The striker has been modified to be able to use German and Italian patterns of 81mm mortar . Home; Swifty. The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. He maintains the ammunition for firing and provides local security for the mortar position. Washington DC 20310-0107, ADRP - Army Doctrine References Publications, ATTP - Army Tactics, Techniques, and Procedures, FY Publication Status Report (CAC required for access), Publishing Resources (CAC required for access), PC/PCO/FMO/EPCO Directory (CAC required for access), usarmy.pentagon.hqda-apd.mbx.customer-service@army.mil, GUN, MACHINE, CAL. d. The ammunition is protected from mud, sand, dirt, and water. The sight is laid on two aiming posts (placed out 50 and 100 meters from the mortar) on a referred deflection of 2800 mils and an elevation of 1100 mils. The firing pin must be replaced and the bore swabbed.
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