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 . a. Table 4-1. (1) The barrel is clean and free from grease and oil both inside and out. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. (1) Mask clearance and overhead clearance are sufficient. 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. 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. The mortar squad consists of five men (Figure 4-1). The standard infantry support weapon is the M-252 81mm mortar, which lobs a 10 lb. The components of the mortar consist of a cannon, mount, and baseplate. Fort Belvoir, VA 22060 (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. 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 fuze has a safety wire that must be removed before firing. Lock Section I. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. LHMBC. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. This round may be stored in a horizontal position. The M734 multioption fuze is the only one used with the 81-mm mortar. c. Authorized Cartridges. To make the shift, the gunner places the fingers of his right hand in the muzzle and his left hand on the left leg. This section implements STANAG 2321 and QSTAG 900 (Edition 1). The gunner then kicks the barrel several times with his heel in an attempt to dislodge the round. 81mm Roll Controlled Guided Mortar (RCGM) - General Dynamics Ordnance Its range and explosive power is greater than the M224, yet it is still light enough to be man . Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . 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. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the The fuze consists of a brass head, body assembly, and expelling charge. When a large number of cartridges are needed for a mission, they may be removed from the containers and prepared. The fuze setter, M25, sets M84-series time fuzes. (3) Markings on rounds. It has a time setting of up to 50 seconds. The cannon has a crew-removable breech plug and firing pin. A lock ( He maintains the ammunition for firing and provides local security for the mortar position. Cartridges assembled with the M532 fuze must be fired above charge 0. A locked padlock The safety/packing clip should be removed when the cartridge is unpacked. 90th IDPG IMA 81mm Mortar Review 50mm? 60mm? 80mm? A guide on picking the right mortar for you Agreed that mortars should generally be used close to the frontline. 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. If the line of sight clears the mask, it is safe to fire. The terms cannon and barrel are used interchangeably in this chapter. The term "indirect fire" means firing at an enemy without having a. This ensures a maximum traversing and elevating capability after making the movement. Ammunition is made and packed to withstand all conditions ordinarily encountered in the field. The fuze consists of a brass head, body assembly, and expelling charge. c. The M374A3 HE cartridge is constructed from pearlitic malleable cast iron and contains about 2.10 pounds of composition B explosive. c. The M375A2, M375A1, and M375 cartridges may also be used. He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. During firing, the breech plug on the barrel is sealed and locked to the rotatable socket in the baseplate. 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 Trenches are dug to prevent water from flowing under the pile. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. d. The ammunition is protected from mud, sand, dirt, and water. The types of fuzes described in this paragraph are point detonating, proximity, mechanical time, multioption, and dummy. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . It can be set from 3 to 55 seconds at half-second intervals. If the barrel is cool enough to handle, the crew removes the round as described below. Identification. (703) 614-3727, Office of the Chief Information Officer 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. If not, the cartridge is placed on its side, and the closing plug is removed using an M18 fuze wrench. 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. Powered by Hugo. Figure 4-4. Bear in mind that these are my personal opinions, experiences, and . 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 body is made of aluminum and brass. Share sensitive information only on official, secure websites. It is designed to be fired in the indirect fire mode, cannot be fired handheld, and norm ally utilizes a FDC. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. This cartridge is ballistically matched to the M374A2, M374A1, and M375 HE cartridges, and weighs about 9.12 pounds. . PDF Principles of Fire Support B2c2437 Student Handout However, since explosives are affected by moisture and high temperature, they must be protected. With the clamps facing away from him, the assistant gunner traverses the buffer carrier to the traversing handwheel and folds the handle. The fuzes may be used for day or night operations. M252 mortar - Wikipedia Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. 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. 81mm, 82 mm & 120 mm Medium and Heavy Mortars - GICHD The cartridge is painted olive drab with yellow markings. U.S. Mortars of World War II - World War Media g. The barrel clamps can be moved along the barrel to counter large changes in elevation. 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 air burst over average types of soil ranges from 1 to 6 meters, depending on the angle of approach. He exposes 1 inch (25 millimeters) of cross-level shaft and folds the handle. The fuze is set manually to proximity, point detonate, or delay modes. This document (FT 81 B3, abridged) consists of two pages, each with a separate table. If it is necessary to leave the ammunition uncovered, it should be raised on dunnage at least 6 inches above the ground. The entire squad stays with the 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. If it gets wet or dirty, it must be wiped off at once. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. M821/M889 81mm HE Mortar Cartridges - GlobalSecurity.org Disposal Precautions. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. An air cavity can form on one side of a cartridge to unbalance it, causing instability in flight. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. 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. They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. b. They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. Dropping may cause the propellant charges to ignite, causing bodily injuries. a. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. Tabulated data. The term "danger close" is included in the call for fire when there are friendly troops or positions within a prescribed distance of the target, specifically 600 meters for artillery or mortars .
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