81mm mortar range table 81mm mortar range table

The term "indirect fire" means firing at an enemy without having a. (2) Burn all dead grass or brush within 30 meters around the burning place. To convert the fuze from PROX to SQ/IMP, the top of the fuze must be rotated 120 degrees (one-third turn) in either direction. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. General Dynamics Ordnance and Tactical Systems is the leading manufacturer of propellants for 60mm, 81mm and 120mm Mortar Systems. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. The cartridge is painted light green with black markings and one narrow brown band. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 (5) Do not leave unused increments unburned in combat operational areas. The gunner checks the baseplate and ensures that--. b. After the 30-minute waiting period, the dud is still dangerous but can be approached and removed carefully or destroyed in place by qualified disposal personnel. Complete cartridges are always handled with care. The assistant gunner places his right hand palm up (1 inch from the muzzle end) under the BAD and his left hand palm down (1 inch from the muzzle end) on top. All PD fuzes are superquick--detonate on impact. General Dynamics Ordnance and Tactical Systems' 81mm Roll Controlled Guided Mortar (RCGM) provides an affordable, flexible solution to meet that need. d. Multioption. a. Before-firing checks include the following: (1) Ammunition should be free of moisture, rust, and dirt. 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). I say 120s are bad because they suffer from terrible dispersion even when not shooting at 6km. Features: The M252 81mm Medium Extended Range Mortar is a crew-served, medium weight mortar which is highly accurate and provides for a greater range (4,500 meters to 5,650 meters) and lethality than the previous 81mm mortar. It uses the M219 propelling charge and weighs about 9.1 pounds. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. b. The 0-second boss is wider and differs in shape from the other body bosses; the safe setting position is indicated by the letter "S" on the fuze body. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. b. Additionally, they carry the 81mm M252 mortar that can only be used in a dismounted capacity. The mortar is mounted and the sight is installed. 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. M120/M121 120 mm Mortar. Light tree foliage and light vegetation affect the height of burst only slightly, but dense tree foliage and dense vegetation increase the height of burst. The cartridge is painted light green and has red markings and one narrow yellow band. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. It uses the M185 propelling charge that consists of eight increments fitted into the spaces between the fins and held by a propellant holder. If it is necessary to leave the ammunition uncovered, it should be raised on dunnage at least 6 inches above the ground. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. This section discusses the. Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. As soon as the sight data are announced, the gunner places it on the sight. 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 components of the mortar consist of a cannon, mount, and baseplate. (1) The barrel is clean and free from grease and oil both inside and out. MFCS Mounted. LHMBC. 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 enemy will use them. c. Crest Clearance. M252A1 81mm Mortar: Maximum Range (meters): 5,935; Ammunition: War reserve HE (M821A3), red phosphorus smoke (M819), visible light illumination (M853A1), infrared illumination (M816), war reserve and training HE (M889A4), and FRP . Following the arm-and-hand signals of the gunner (who is looking through the sight unit), he moves the far aiming post so that the gunner obtains an aligned sight picture. HE Guided Mortar is in development. In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. The following are authorized (Standard B) cartridges for the 81-mm mortar, M252: Each cartridge has fins around the tail to stabilize it in flight and to cause it to strike fuze-end first. They are assembled with either an M524-series, M526-series, or M567 fuze. More uniform firing is obtained if ammunition is kept at the same temperature. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. ), 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. While the assistant gunner supports the barrel, the gunner slackens the leg-locking handwheel, releases the locating catch, and positions the plain leg. The gunner is given an administrative command to lay the mortar on a deflection of 2860 or 2740 mils. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. They are fuzed with the M524-series, M256-series, or M532. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. . Placing the mortar in position at night does not relieve the gunner of the responsibility of checking for mask clearance and overhead interference. The M252 medium mortar offers a compromise between the light and heavy mortars. c. Authorized Cartridges. a. (c) The gunner determines mask and overhead clearance by sighting along the barrel with his eye near the breech plug. e. The squad leader picks up the aiming posts and sight. (2) The ribs and braces have no breaks, cracks, or dents. The body is made of aluminum and brass. It has no safety pins or wires to reduce preparation time. After the mortar is mounted, the gunner makes a thorough check. An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. The mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. The fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. Figure 4-7. The Mark 4 and 5 barrels were introduced during World War 2 and have a much increased range. The cartridge weighs about 9.12 pounds. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. He indicates the initial direction of fire by pointing in that direction and commands ACTION. . M3A1 Baseplate The vertical cross line of the sight is on the left edge of the aiming point. It weighs about 9.05 pounds. The M252 81mm Medium Extended Range Mortar is a crew-served, medium weight mortar which is highly accurate and provides for a greater range (4,500 meters to 5,650 meters) and lethality than the . This is the inert PD fuze type "IR-81" used by the Italians for their 81mm mortar rounds during WWII. It is especially useful if the baseplate sinks deep into the ground during prolonged firing. SMALL DEFLECTION AND ELEVATION CHANGES. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. Additional information is included on an ammunition data card inside each container. Maximum Range (meters): 7,240 (with standard fuze) . The fuze is not intended to function at charge 0. It can be set from 3 to 55 seconds at half-second intervals. 107 Army Pentagon 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. The fuze consists of a brass head, body assembly, and expelling charge. This may preclude moving the bipod. c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. Safety before firing is provided by a safety wire, which must be removed just before firing. Table 4-3. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. . a. Point-Detonating. This round must be stored in a vertical position. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. A .mil website belongs to an official government organization in the United States. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. d. The M374A2, M374A1, and M374 HE cartridges are painted olive drab with yellow markings and are constructed from pearlitic malleable cast iron. All elements given in the fire command are repeated by the squad. It is set using the bladed end of the M18 fuze wrench. 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. At this command, the squad proceeds as follows: a. The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. 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. The propelling charge is contained in four horseshoe-shaped, felt-fiber containers or nine wax-tested, cotton cloth, bag increments. b. (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. The fuze should already be fitted to the cartridge. (3) The circlip is correctly located, securing the rotating socket to the baseplate. From introduction up to halfway World War 2 the ML 3-inch had a poor range of up to 1.45 km. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. It is fitted with a standard pull wire and safety pin that are removed immediately before 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. Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . LARGE DEFLECTION AND ELEVATION CHANGES. News. The firing pin must be replaced and the bore swabbed. The gunner levels the elevation bubble by turning the elevation micrometer knob and reading the setting on the elevation scale and elevation micrometer--this setting is the minimum mask clearance. The M751 is fitted with a smoke charge that operates on impact. (The handle of the wrench is turned counterclockwise.) d. The gunner recovers the baseplate to the area designated by the squad leader. The squad leader points to the exact spot where the mortar is to be mounted. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. The components of the mortar consist of a cannon, mount, and baseplate. The leg-locking handwheel must then be tightened, ensuring the teeth are correctly meshed. (2) The M84 fuze is a single-purpose, powder-train, mechanical-time fuze used with the 81-mm M301A1 and M301A2 illuminating cartridges. 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. However, since explosives are affected by moisture and high temperature, they must be protected. The removable increments are fitted onto or around the shaft, depending on their type. The assistant gunner cleans the bore and swabs it dry. With the mortar mounted and the sight installed, the gunner lays the sight on the 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. 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. If the mortar section is to operate quickly and effectively in accomplishing its mission, mortar squad members must be proficient in individually assigned duties. 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. It uses the M772 mechanical time fuze and weighs about 10.6 pounds. (b) In selecting the exact mortar position, the leader looks quickly for mask clearance and overhead interference. Designed by Thingsym. The same procedure for aligning the far aiming post is used to align the near aiming post. The mortar should be within two turns of center of traverse when the task is compete. f. Installation. With the mortar mounted and the sight installed, the gunner lays the sight on the 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 traversing screw assembly is fitted to the clamp assembly, which is pivoted in the center on an arm attached to the elevating leg. This is accomplished by depressing the barrel until the top of the mask is clear. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. The adjustment ring has six raised ribs for use in conjunction with fuze setter, M25, and a setting indicator rib (marked SET) about half the height and width of the other six ribs. SQUAD AND SECTION ORGANIZATION AND DUTIES, Each member of the infantry mortar squad has principle duties and responsibilities. d. When the barrel reaches the horizontal position, and not before, the assistant gunner moves the thumb of each hand over the muzzle. An air cavity can form on one side of a cartridge to unbalance it, causing instability in flight. Both legs are fitted with a disk-shaped foot with a spike beneath to prevent the mount from slipping. At extreme temperatures (below -40 degrees Fahrenheit and above 125 degrees Fahrenheit), it is not unusual to experience an increase in malfunctions proportionate to the severity of conditions. a. CANNON . f. The open end of the socket must continue to point in the direction of fire. The M532 fuze is a radio doppler fuze that has a proximity (PROX) or SQ/IMP function. This section discusses the characteristics and nomenclature of each component (Figure 4-2). Official websites use .mil b. The M375A3 cartridge is ballistically similar to the M374A3 (HE) cartridge. They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. 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. Barrel (with blast attenuator device) If the fuze does not function as set, it automatically functions at the next lower setting. It is a 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. b. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. 60mm, 81mm, and 120mmMortar Increments. f. If the above procedure fails to remove the misfire, the barrel must be kept horizontal. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. (See FM 7-90 for a discussion of the duties of the platoon headquarters.). An 81 mm mortar is a medium-weight mortar. The fuze is set manually to proximity, point detonate, or delay modes. .50 MACHINE GUN, M3; FIRING CARTRIDGE, CAL. WP cartridges are stored with the fuze end up. (6) The primer cartridge is checked for damage or dampness. M64A1 Sightunit. The M751 fuze is the only dummy fuze used with the 81-mm mortar. DESCRIPTION. If the round does not fire, the gunner tests the barrel for heat. 9301 Chapek Road., Bldg.1458 e. Care, Handling, and Preservation. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. 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. No tools are needed to set the fuze, and the setting can be changed several times without damaging the fuze. The gunner moves the mortar as the assistant gunner steadies it. Its range and explosive power is greater than the M224, yet it is still light enough to be man . If the primer is not dented, the round may be used again. VERY NICE condition! c. The M375A2, M375A1, and M375 cartridges may also be used. high-explosive bomb at a range of about three miles. This section implements STANAG 2321 and QSTAG 900 (Edition 1). b. . Attached to the right of the screw is the traversing handwheel. Once set to act as an impact fuze, the mechanism cannot be reset for PROX. The assistant gunner checks the bipod and ensures that--. Tabulated data. The first table is a chart that shows range and elevation for firing particular mortar shells. Illuminating is used for battlefield illumination and signaling. .50 MACHINE GUN, M55 AND MACHINE GUN, CAL. The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. The gunner then kicks the barrel several times with his heel in an attempt to dislodge the round. Agreed that mortars should generally be used close to the frontline. The ignition cartridge (with primer) is fitted into the base of the fin shaft. Mount Proximity (VT). The mortar is then re-laid on the aiming posts using the traversing crank. 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. The elevation change announced must be less than 90 mils and more than 35 mils. (1) The rotating socket is free to move in a complete circle. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. b. The M252 system . It is painted white with black markings. 1:4 For the 81MM Mortar System: X NSN (LIN): 1015-01-441-3113 : STAFF SECTION, CLEANING, ARTILLERY 1:4: High explosive--M821, M889, M374-series, and M362. It has four function settings: PRX (proximity) causes the cartridge to explode between 3 and 13 feet above the ground; NSB (near-surface burst) causes the cartridge to explode up to 3 feet above the ground; IM (impact) causes the cartridge to explode on contact; and DLY (delay) incorporates a 0.05-second delay in the fuze train before exploding the cartridge.