The entire squad stays with the mortar. It is used for records such as reports on condition, malfunctions, and accidents. He places his thumbs alongside the forefingers, being careful to keep both hands away from the muzzle. This is accomplished by depressing the barrel until the top of the mask is clear. They contain about 2.10 pounds of composition B explosive. High explosive is used for both fragmentation and blast effect against personnel and light-skinned vehicles. d. The first ammunition bearer stands to the right rear of the mortar. He indicates the initial direction of fire by pointing in that direction and commands ACTION. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. MFCS Dismounted. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. b. It is assembled with the M772A1 MTSQ. b. (See FM 7-90 for a discussion of the duties of the platoon headquarters.). Examples are: To dismount the mortar, the squad leader commands, OUT OF ACTION. Attached to the right of the screw is the traversing handwheel. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. 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. a. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. Swifty 3 from scratch; Swifty 3 split-repo setup; Swifty Troubleshooting; Mods. The gunner is given a deflection change in a fire command between 20 and 60 mils inclusive. 0.30, BROWNING, M1917A1; GUN, MACHINE: CAL. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. How the RCGM works: Target coordinates are programed into the RCGM using a portable GPS setter. Proximity fuzes withstand normal handling without danger of detonation or damage when in their original packing containers or when assembled to projectiles in their packing containers. .30, BROWNING, M1919A4 AND M2 (HEAVY BARREL), .30, M2 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE: CAL. e. Dummy. Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . (1) Mask clearance and overhead clearance are sufficient. The M821 HE cartridge (M252 only) is a British-made cartridge fitted with the US M734 multioption fuze. The air burst over average types of soil ranges from 1 to 6 meters, depending on the angle of approach. Mortars are indirect-fire weapon systems. The 81mm weapons platoon consisted of the headquarters platoon and four mortar squads. After the barrel cools, the gunner removes the sight and firing pin. The firing pin must be replaced and the bore swabbed. It uses the M219 propelling charge and weighs about 9.1 pounds. The cartridge is painted olive drab with yellow markings and weighs about 9.05 pounds. Range Minimum to maximum 83 to 5,608 meters Rate of Fire . The assistant gunner cleans the bore and swabs it dry. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. It should be destroyed in accordance with standard procedures. . 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. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the b. .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MTD: MULTIPLE CAL. Table 4-2. An M18 fuze wrench is used to change settings. General Dynamics Ordnance and Tactical Systems' 81mm Roll Controlled Guided Mortar (RCGM) provides an affordable, flexible solution to meet that need. When the gunner is satisfied with his sight picture he announces, "Up.". a. They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. When set at delay, the fuze train causes a 0.05-second delay before functioning. After the mortar is mounted, the gunner makes a thorough check. The cannon assembly consists of the barrel that is sealed at the lower end with a removable breech plug, which houses a removable firing pin (Figure 4-3). See Chapter 3, paragraph 3-14 for a detailed discussion of malfunctions. Several types of HE ammunition are used in the 81-mm mortar, M252. MFCS Mounted. Fired . The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. OPERATOR`S MANUAL FOR MORTAR, 81-MM, M252 (NSN 1015-01-164-6651) (EIC 4SK){TM . The principal factors affecting height of burst are the angle of approach to the target and the reflectivity of the target terrain. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. He is also the squad driver. The BAD is removed only by qualified maintenance personnel. He maintains the ammunition for firing and provides local security for the mortar position. The propelling charge is contained in four horseshoe-shaped, felt-fiber containers or nine wax-tested, cotton cloth, bag increments. 4-10. When the baseplate is in position, the first ammunition bearer lowers the breech plug into the rotating socket and rotates the barrel a quarter of a turn to lock it. It provides illumination for about 60 seconds with 600,000 candlepower illumination. Overhead interference can be branches of trees or roofs of buildings. High angles of approach (near vertical) give the lowest burst heights. Additional information is included on an ammunition data card inside each container. The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. Any target that requires that elevation, or a lower one, cannot be engaged from that position. The RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the b. Illuminating is used for battlefield illumination and signaling. d. The gunner removes the sight from its case, mounts it on the mortar, and sets a deflection of 3200 mils and an elevation of 1100 mils. It uses the M185 propelling charge that consists of eight increments fitted into the spaces between the fins and held by a propellant holder. h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. 4-12. The mount consists of elevating and traversing mechanisms and a bipod (Figure 4-4). (1) The barrel is clean and free from grease and oil both inside and out. News. 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. 81mm smoothbore mortar Barrel length 1.28 m Muzzle velocity 225 m/s Elevation +45 to +85 Traverse 18 Fire control Sights C2 indirect fire sight with illumination Firepower Rate of fire 20 rpm maximum 15 rpm normal 1 to 12 rpm sustained Range 5.650 m maximum 100 m minimum Media 81mm L16A2 Tabular Firing Tables TFT ORDER FORM 1.Select "Mortar" 2.Select which mortar caliber 3.Select mortar system nomenclature 4.Select which TFTs to order 5.Put in quantity and click "Add TFTs" 6.Click "Next" TFT JUSTIFICATION 1.Put in TFT Ordering Justification 2.Click "Next" SHIPPING INFORMATION 1.Fill out all required fields Short cartridges can be expected when firing below charge 4. b. He ensures that the firing pin recess is facing upwards. The fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. WP cartridges are stored with the fuze end up. The gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel. The M252 81 mm medium weight mortar is a British-designed smooth bore, muzzle-loading, high-angle-of-fire weapon used for long-range indirect fire support to light infantry, air assault, and airborne units across the entire front of a battalion zone of influence. This round may be stored in a horizontal position. e. Care, Handling, and Preservation. The M821/M889 are 81mm HE Mortar Cartridges. He levels all bubbles. Table 4-1. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 [US Army.] The cartridge uses the M205 propelling charge and is assembled with the M567 or M524-series fuze. The mortar is then re-laid on the aiming posts using the traversing crank. 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. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. Remaining increments are repositioned towards the rear of the tail fin assembly when firing the cartridge with horseshoe-shaped increments at less than full charge. Cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. LARGE DEFLECTION AND ELEVATION CHANGES. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. A locked padlock The powder increments, mainly, should not be exposed to direct sunlight. The cartridge can be fitted with the M524-series, M526-series, M567, or M532 fuzes. Agreed that mortars should generally be used close to the frontline. Powered by Hugo. e. The pull wire and safety wire are removed from the fuze just before firing. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. During firing, the breech plug on the barrel is sealed and locked to the rotatable socket in the baseplate. The gunner places the outer edge of the baseplate against the baseplate stake so that the left edge of the cutaway portion of the baseplate is aligned with the right edge of the stake (Figure 4-7). The table on the right describes the three most common setups. Upon completion of any bipod movement on the barrel, the gunner ensures that the firing pin recess is facing upward. The cartridge is painted olive drab with yellow markings. Mount, M177, in folded position. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. They should not be approached for 5 minutes or disturbed for at least 30 minutes after firing. 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 cartridge weighs about 9.12 pounds. 9301 Chapek Road., Bldg.1458 The Mark 4 and 5 barrels were introduced during World War 2 and have a much increased range. Bear in mind that these are my personal opinions, experiences, and . 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. He stands to the rear of the baseplate and supports the barrel until the bipod is fitted. The sight bracket is attached to the buffer carrier, which is fitted to the traversing screw assembly. LHMBC. M64A1 Sightunit. Fuzes are not disassembled. No tools are needed to set the fuze, and the setting can be changed several times without damaging the fuze. a. a. Before-firing checks include the following: (1) Ammunition should be free of moisture, rust, and dirt. After the bands are broken and the box opened, the rounds should be removed by allowing them to roll out along the lid of the box (Figure 4-8). The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. ), FIRING TABLES FOR CANNON, 155MM HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A4 AND CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 FIRING PROJECTILE, HE, M483A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), 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, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 FIRING PROJECTILE, HERA, M549 PROJECTILE, HERA, M549A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR CANNON, 155MM HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A1; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A1B; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A4 AND 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, HERA, M549 AND PROJECTILE, HERA, M549A1 (S&I BY PROPONENT, SEE DEAILS, FOOTNOTES. The M532 fuze is a radio doppler fuze that has a proximity (PROX) or SQ/IMP function. a. b. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. It weighs about 9.05 pounds. The M734 multioption fuze is the only one used with the 81-mm mortar. The cartridges are returned to their original containers. The explosive elements in primers and fuzes are sensitive to shock and high temperature. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. on Amazon.com. All PD fuzes are superquick--detonate on impact. Joint Tables of Allowance; PB - Professional Bulletins; STP - Soldier Training Publications; TC - Training Circulars; . (1) The M935 fuze has two function settings: impact and delay. The body is made of aluminum and brass. 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. Normally, it can be moved by hand, although this may be difficult to do if the mortar is moved through a large arc. a. He must not stand directly behind the mortar. e. The squad leader picks up the aiming posts and sight. c. Authorized Cartridges. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. 0.50, M8 (REPRINTED W/BASIC INCL C1-2) (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MOUNTED: MULTIPLE CALIBER .50 MACHINE GUN, M55 FIRING CARTRIDGE, CALIBER .50: API, M8 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: FICED, M85 TANK, COMBAT, FULL TRACKED: 105MM GUN, M60 SERIES FIRING CARTRIDGE, CALIBER .50: API, M8 CARTRIDGE, CALIBER .50: API-T M20 CARTRIDGE, CALIBER .50: BALL, M33 CARTRIDGE, CALIBER .50: TRACER, M17 (S&I BY PROP SEE DETAILS, FOOTNOTES), MACHINE GUN, CAL.
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