81mm mortar range table 81mm mortar range table

The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. If it is necessary to leave the ammunition uncovered, it should be raised on dunnage at least 6 inches above the ground. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. It is used for records such as reports on condition, malfunctions, and accidents. It is painted white with black markings. M327 mortar is an extended range mortar system operated by Marine Corps Artillery Units. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the DESCRIPTION. When the approximate alignment is completed, the gunner signals the assistant gunner to lower the bipod by pushing down on the mortar. .50: AP, M2 AND CARTRIDGE, CAL. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. News. The gunner then kicks the barrel several times with his heel in an attempt to dislodge the round. b. The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. 4-12. . Illuminating is used for battlefield illumination and signaling. b. Range Minimum to maximum 83 to 5,608 meters Rate of Fire . The M853 and M301A3 illuminating ammunition are described herein. The first table is a chart that shows range and elevation for firing particular mortar shells. The squad leader indicates the direction of fire when mounting. When set at delay, the fuze train causes a 0.05-second delay before functioning. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. If it gets wet or dirty, it must be wiped off at once. After the mortar is mounted, the gunner makes a thorough check. Agreed that mortars should generally be used close to the frontline. Fuzes are not disassembled. Cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the U.S. Marine Corps and U.S. Navy only. Before the mortar is mounted, the squad must perform premount checks. 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. He may assist the gunner in shifting the mortar when the gunner is making large deflection changes. Those cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. CANNON . If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. (5) Four inches of elevation shaft are exposed, and the shaft is not bent. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. The fuze setter, M25, sets M84-series time fuzes. An official website of the United States government. f. If the above procedure fails to remove the misfire, the barrel must be kept horizontal. mortar, 81-mm: m29a1 and m29; firing cartridge, he, m374a2 and m374; cartridge, wp, m375a2 and m375 (s&i by prop see details, footnotes) ardec: ft 81-al-4(abr) active: 12/24/1970: firing tables for mortar, 81mm, m29 and m1 firing cartridge, illuminating, m301a3 with fuze, time, m84a1, height of burst, 600 meters (s&i by prop see details . Dropping may cause the propellant charges to ignite, causing bodily injuries. a. He must ensure that the ball-shaped end of the locking rod is secured in its recess by the locking latch. The M375A3 cartridge is ballistically similar to the M374A3 (HE) cartridge. The cartridge must not be fired below charge 3. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. a. The M374A2 and M374A1 cartridges are fitted with the M90A1 propelling charge. MC Medical Guide; Client-side mods; TFAR 1.x for players; The components of the mortar consist of a cannon, mount, and baseplate. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. a. These are NDI items . c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. Section I. It is fitted with a safety wire and pin that are removed immediately before firing. Mortars are indirect-fire weapon systems. c. The first ammunition bearer checks the barrel and ensures that--. Joint Tables of Allowance; PB - Professional Bulletins; STP - Soldier Training Publications; TC - Training Circulars; . This section discusses the. (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. All mortar cartridges are painted to prevent rust and to identify their type. OPERATOR`S MANUAL FOR MORTAR, 81-MM, M252 (NSN 1015-01-164-6651) (EIC 4SK){TM . The sight bracket is attached to the buffer carrier, which is fitted to the traversing screw assembly. The assistant gunner checks the bipod and ensures that--. (1) Marking on container. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. The striker has been modified to be able to use German and Italian patterns of 81mm mortar . They are assembled with either an M524-series, M526-series, or M567 fuze. The removable increments are fitted onto or around the shaft, depending on their type. Cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. M3A1 Baseplate Notches in the setter engage ribs in the setting ring of the fuze. Designed by Thingsym. The cartridges are painted olive drab with yellow markings. High explosive--M821, M889, M374-series, and M362. If the round fires, the mortar is re-laid on the aiming point and firing is continued. 9301 Chapek Road., Bldg.1458 The fuze should already be fitted to the cartridge. He levels all bubbles. It can provide all-weather, ground-based, close supporting, accurate, immediately A .mil website belongs to an official government organization in the United States. 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 ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. High explosive is used for both fragmentation and blast effect against personnel and light-skinned vehicles. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. 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. (b) In selecting the exact mortar position, the leader looks quickly for mask clearance and overhead interference. The firing pin must be replaced and the bore swabbed. The gunner is given an administrative command to lay the mortar on a deflection of 2860 or 2740 mils. a. The gunner is given a deflection change in a fire command between 20 and 60 mils inclusive. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. Mount, M177, in folded position. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. (3) Markings on rounds. At the muzzle end is a cone-shaped blast attenuator device (BAD) that is fitted to reduce noise. When fired, the cartridge carries the ignition cartridge with it, leaving the mortar ready for the next cartridge. Developed by Hirtenberger Defence Systems (HDS), the rugged and reliable M8 comprises an 81 mm long-range weapon available in different barrel lengths, an entire range of ammunition, auxiliary field equipment, sighting systems and a fully digital fire-control system containing all ballistic data. The American M1 81mm Mortar, like the upcoming M2 60mm Mortar, was based on a French design by Edgar William Brandt (1880-1960). The cannon has a crew-removable breech plug and firing pin. 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. He indicates the initial direction of fire by pointing in that direction and commands ACTION. The first ammunition bearer shakes the barrel to dislodge any remnants from the last round fired, and he lowers the barrel into the rotating socket of the baseplate. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. The propellant increments are ignited, which produce rapidly expanding gases that force the cartridge from the barrel. 0.30, BROWNING, M1917A1; GUN, MACHINE: CAL. The platoon leader commands the platoon and supervises the training of the elements. The propelling charge is contained in four horseshoe-shaped, felt-fiber containers or nine wax-tested, cotton cloth, bag increments. Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. (1) Mask clearance and overhead clearance are sufficient. The fuze has a safety wire that must be removed before firing. The term "indirect fire" means firing at an enemy without having a. Official websites use .mil The cartridge is painted olive drab with yellow markings. A lock ( 60mm, 81mm, and 120mmMortar Increments. 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 The gunner moves the mortar as the assistant gunner steadies it. The baseplate (Figure 4-5) is of one-piece construction, and supports and aligns the mortar for firing. 81mm 120mm 60mm . The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. e. The M362A1 and M362 HE cartridges are of steel forge construction and contain about 2.10 pounds of composition B explosive. b. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. b. The safety/packing clip should be removed when the cartridge is unpacked. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. The ignition cartridge strikes the firing pin and detonates, which causes a flash that passes through the radial holes in the shaft. The entire squad stays with the mortar. He lays for deflection, taking the proper sight picture. a. 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. He moves the mortar until the vertical line of the sight is aligned approximately on the aiming post. Referring and realigning aiming posts ensure that all mortars are set on the same data. Red phosphorus rounds can be fired from the M29/M29A1 at a reduced charge (maximum charge = charge 2). He stands to the rear of the baseplate and supports the barrel until the bipod is fitted. Training practice--M879, M880, M68, and sabot. Trenches are dug to prevent water from flowing under the pile. 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. If the line of sight clears the mask, it is safe to fire. (1) The rotating socket is free to move in a complete circle. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. These propellants are flash-suppressed and clean burning resulting in minimum residue, flash and blast overpressure. The mount consists of elevating and traversing mechanisms and a bipod (Figure 4-4). Burst Height. b. During training, the gunner may use the driving stake from the aiming post case. The second page includes a chart with range and deflection (presumably for the same kind of shells), as well as notes which give additional instructions. M64A1 Sightunit. It is assembled with the M772A1 MTSQ. (2) The fin and fuze assembly must be checked for tightness and damage. (5) Do not leave unused increments unburned in combat operational areas. Several types of RP/WP ammunition are described herein. The principal factors affecting height of burst are the angle of approach to the target and the reflectivity of the target terrain. All elements given in the fire command are repeated by the squad. Identification. (1) The barrel is clean and free from grease and oil both inside and out. The mortar should be within two turns of center of traverse when the task is compete. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. 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 M821/M889 are 81mm HE Mortar Cartridges. At this command, the squad proceeds as follows: a. b. The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. e. Dummy. On its right side, the clamp is recessed to receive the ball end of the locking rod. e. The gunner centers the elevation bubble. This document (FT 81 B3, abridged) consists of two pages, each with a separate table. a. The mortar is within two turns of center of traverse. Ammunition is made and packed to withstand all conditions ordinarily encountered in the field. The second ammunition bearer retrieves the aiming posts. 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 . 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. 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. The traversing screw assembly is fitted to the clamp assembly, which is pivoted in the center on an arm attached to the elevating 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. This cartridge is ballistically matched to the M374A2, M374A1, and M375 HE cartridges, and weighs about 9.12 pounds. c. Crest Clearance. Attached to the right of the screw is the traversing handwheel. The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. The fuze contains a delayed arming feature that ensures the fuze remains unarmed and detonator safe for a minimum of 1.25 seconds of flight. Army Publishing Directorate If he is not within 20 mils, the gunner and assistant gunner must make another large shift before moving on. c. The moisture-resistant seal of the container is broken when the ammunition is to be used. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. Additionally, they carry the 81mm M252 mortar that can only be used in a dismounted capacity. a. WP cartridges are stored with the fuze end up. FIRING TABLE 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; AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B; 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 FIRING PROJECTILE, GUIDED, M712 (COPPERHEAD) WITH SHAPED TRAJECTORIES (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM, HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 AND 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, BASE-BURN, M864 AND M864A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), PRELIMINARY AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, XM982 (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, XM982 (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, M982 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 165-MM GUN, M135 ON COMBAT ENGINEER VEHICLE, FULL TRACKED, M728; FIRING CARTRIDGE, 165-MM, HEP, M123A1 AND 165-MM, TP-T, XM623 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 175-MM GUN, M113 AND M113A1 ON GUN, FIELD ARTILLERY, SELF-PROPELLED: 175-MM, M107; FIRING PROJECTILE, HE, M437A2 AND M437A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICERS (XOS) MINIMUM QUADRANT ELEVATION WITH CANNON, 105MM HOWITZER, M20A1 ON HOWITZER, LIGHT, TOWED, 105MM, M119A1; HOWITZER, LIGHT, TOWED, 105MM, M119A2; HOWITZER, LIGHT, TOWED, 105MM, M119A3 FIRING WITH PROPELLING CHARGES, M67 AND M200 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICER S (XO S) MINIMUM QUADRANT ELEVATION WITH CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5/A6 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1/A2 FIRING WITH PROPELLING CHARGES, M231, M232, AND M232A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICERS (XOS) MINIMUM QUADRANT ELEVATION WITH CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6; AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A7, AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 AND HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING WITH PROPELLING CHARGES, M231, M232, AND M232A1 (S&I BY PROPONENT, SEE DETAILS, FOOTNOTES), ADDENDUM TO FTR LANCE-B-1 FOR WARHEAD SECTION, GUIDED MISSILE, HE: M251 (U) (S&I BY PROP SEE DETAILS, FOOTNOTES), Search Army publications and forms by Number, Title, or Record Detail. The Mark 4 and 5 barrels were introduced during World War 2 and have a much increased range. After the rounds have been removed, they should always be handled with two hands to prevent accidental dropping. If the primer is not dented, the round may be used again. c. Authorized Cartridges. 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. The gunner checks the baseplate and ensures that--. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. MFCS Mounted. 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. . If required, the gunner/assistant gunner lowers the barrel so that the breech plug engages with the open end of the socket, and he uses the barrel as a lever to move the socket. 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. A locked padlock Several types of HE ammunition are used in the 81-mm mortar, M252. Overhead interference can be branches of trees or roofs of buildings. The first ammunition bearer holds the barrel until the assistant gunner has removed the mount. 81MM M252A1. (4) The leg-locking handwheel is hand tight. If not, he may still fire at the desired range by selecting a charge zone having a higher elevation. The barrel clamps are then closed. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. (1) The M935 fuze has two function settings: impact and delay. VERY NICE condition! b. a. Point-Detonating. They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. REFERRING OF THE SIGHT AND REALIGNMENT OF AIMING POSTS USING M64 SIGHT. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. When set at SQ, the fuze functions on point impact or graze contact. All rounds are colored according to their type. The mortar is then re-laid on the aiming posts using the traversing crank. The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. .50 MACHINE GUN, M3; FIRING CARTRIDGE, CAL. News. e. Care, Handling, and Preservation. Firing tables are used to determine the correct charge for firing. SMALL DEFLECTION AND ELEVATION CHANGES. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load.