c. Crest Clearance. The gunner is given a deflection and elevation change in a fire command causing the gunner to shift the mortar between 200 and 300 mils for deflection and between 100 and 200 for elevation. When targets are beyond such irregularities, a clearance of at least 30 meters should be allowed to ensure maximum effect over the target area. There is a selector on the lower shaft for non-delay or delay impact action. a. The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. The assistant gunner cleans the bore and swabs it dry. Fuzes are not disassembled. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. He indicates the initial direction of fire by pointing in that direction and commands ACTION. Short cartridges can be expected when firing below charge 4. Weights (pounds) System (including basic issue items) Barrel (with blast attenuator device) Mount M3A1 Baseplate The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. Figure 4-7. The fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. The safety pull wire is removed just before inserting the cartridge into the mortar. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. A lock ( 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. The mortar is within two turns of center of traverse. The platoon leader commands the platoon and supervises the training of the elements. Burst Height. The fuze setter, M25, sets M84-series time fuzes. d. Multioption. c. The assistant gunner moves into position to the front of the bipod on his right knee and grasps the bipod legs (palms up), lifting until they clear the ground enough to permit lateral movement. If the round fires, the mortar is re-laid on the aiming point and firing is continued. a. These propellants are flash-suppressed and clean burning resulting in minimum residue, flash and blast overpressure. Finally, the assistant gunner loosens the leg-locking handwheel, presses the spring-loaded locating catch, and raises the plain leg behind the buffer cylinders until it touches the traversing handwheel. They should not be approached for 5 minutes or disturbed for at least 30 minutes after firing. They are assembled with either an M524-series, M526-series, or M567 fuze. The types of fuzes described in this paragraph are point detonating, proximity, mechanical time, multioption, and dummy. 81mm 120mm 60mm . Bear in mind that these are my personal opinions, experiences, and . (5) Do not leave unused increments unburned in combat operational areas. 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. The components of the mortar consist of a cannon, mount, and baseplate. DESCRIPTION. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. 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. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. Several types of RP/WP ammunition are described herein. Trenches are dug to prevent water from flowing under the pile. It can provide all-weather, ground-based, close supporting, accurate, immediately An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. It has a time setting of up to 25 seconds. Theme by TechDoc. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. The propelling charge consists of an ignition cartridge and removable propellant increments. a. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 1:4 For the 81MM Mortar System: X NSN (LIN): 1015-01-441-3113 : STAFF SECTION, CLEANING, ARTILLERY 1:4: He rotates the socket so that the open end is pointing in the direction of fire. A .mil website belongs to an official government organization in the United States. An M18 fuze wrench is used to change settings. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. b. b. Complete cartridges are always handled with care. The M889 HE cartridge (M252 onlyXUS Marine Corps) is of the same construction as the M821 cartridge in every detail except the fuze, which is the M935. The 81mm mortar is a portable, mobile, medium mortar at the infantry's disposal. The propelling charges are assembled around the fin assembly shaft. 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. News. It is especially useful if the baseplate sinks deep into the ground during prolonged firing. 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. After the barrel cools, the gunner removes the sight and firing pin. (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. b. g. The barrel clamps can be moved along the barrel to counter large changes in elevation. 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. The M29 would become the standard American mortar in the upcoming Vietnam War. WP cartridges are stored with the fuze end up. b. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. The Mark 4 and 5 barrels were introduced during World War 2 and have a much increased range. The fuze is nicely marked and is dated 1940. b. It uses the M219 propelling charge and weighs about 9.1 pounds. Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. (3) The M256-series fuze has an SQ/IMP function only. The mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. The M734 multioption fuze is the only one used with the 81-mm mortar. .50: AP, M2 AND CARTRIDGE, CAL. Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . (1) The M935 fuze has two function settings: impact and delay. h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. .50 MACHINE GUN, M55 AND MACHINE GUN, CAL. c. Authorized Cartridges. a. If the primer is not dented, the round may be used again. c. The elevating shaft is contained in the elevating leg; to the left of the elevating leg is the elevating handwheel. Check the post SOP before applying the following procedure: (1) Select a place at least 100 meters from the mortar position, parked vehicles, and ammunition piles. (4) The bipod locking latch is locked, securing the barrel clamps. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. The mortar squad consists of five men (Figure 4-1). The fuze is not intended to function at charge 0. 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. (1) Marking on container. VERY NICE condition! It is designed to be fired in the indirect fire mode, cannot be fired handheld, and norm ally utilizes a FDC. (5) With the exception of a few unused increments (within the same ammunition lot number) as replacements for defective increments, excess powder should be removed from the mortar position. 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 round is still safe to handle and transport if the safety wire is reinserted. In any case, the gunner must ensure that the cartridge does not strike an obstacle. Mount, M177, in folded position. d. Climatic Effects. Proximity (VT). c. The M374A3 HE cartridge is constructed from pearlitic malleable cast iron and contains about 2.10 pounds of composition B explosive. (d) Firing is slowed if mask clearance must be checked before each firing but this can be eliminated if minimum mask clearance is determined. The gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel. (1) Mask clearance and overhead clearance are sufficient. It is used for records such as reports on condition, malfunctions, and accidents. HE Guided Mortar is in development. However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. The term "indirect fire" means firing at an enemy without having a. The American M1 81mm Mortar, like the upcoming M2 60mm Mortar, was based on a French design by Edgar William Brandt (1880-1960). Proximity-fuzed short cartridges, which are duds, contain a complete explosive train and impact element. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. An internal clock mechanism provides nine seconds of safe air travel (610 to 2,340 meters along trajectory for charge 0 through 9, respectively). Propelling charges are covered or protected from dampness or heat. The propellant increments are ignited, which produce rapidly expanding gases that force the cartridge from the barrel. 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 . When the fuze of the misfired round reaches the BAD, the assistant gunner stops the round with his thumbs (he does not touch the fuze) and carefully removes it from the barrel. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. high-explosive bomb at a range of about three miles. 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. The section leader, acting as FDC, has one deflection instead of two or more. He places his thumbs alongside the forefingers, being careful to keep both hands away from the muzzle. The enemy will use them. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. 4-10. A plain leg is fitted to a stud on the elevating leg and is secured by a leg-locking handwheel. (8) To help minimize the occurrence of short rounds and or duds, unpackaged ammunition that has been dropped should not be fired. The barrel clamp, which consists of an upper and lower clamp, is situated at the top. The second ammunition bearer retrieves the aiming posts. The cartridge is painted light green and has red markings and one narrow yellow band. The entire squad stays with the mortar. The elevation change announced must be less than 90 mils and more than 35 mils. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the Its range and explosive power is greater than the M224, yet it is still light enough to be man . 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 gunner checks the baseplate and ensures that--. (The handle of the wrench is turned counterclockwise.) Any target that requires that elevation, or a lower one, cannot be engaged from that position. (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. 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. on Amazon.com. It is set using the bladed end of the M18 fuze wrench. .30, BROWNING, M1919A4 AND M2 (HEAVY BARREL), .30, M2 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE: CAL. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. LHMBC. When firing under the control of an FDC, he reports to the FDC that mask clearance cannot be obtained at a certain elevation. However, since explosives are affected by moisture and high temperature, they must be protected. The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. It is fitted with a standard pull wire and safety pin that are removed immediately before firing. Section I. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. Long Range PGK. Identification. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. The bipod provides front support for the barrel and carries the gears necessary to lay the mortar. News. These are NDI items . 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 . 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. c. The gunner grasps both ends of the traverse screw assembly and supports the mortar during the subsequent drill. The fuze is set manually to proximity, point detonate, or delay modes. ), 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. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. [1] [2] Many countries use or used an 81 mm mortar in their armed forces. The leg-locking handwheel must then be tightened, ensuring the teeth are correctly meshed. Additional information is included on an ammunition data card inside each container. e. The M362A1 and M362 HE cartridges are of steel forge construction and contain about 2.10 pounds of composition B explosive. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. It provides illumination for about 60 seconds with 600,000 candlepower illumination. a. Swifty 3 from scratch; Swifty 3 split-repo setup; Swifty Troubleshooting; Mods. The traversing screw assembly is fitted to the clamp assembly, which is pivoted in the center on an arm attached to the elevating leg. The propelling charge is contained in four horseshoe-shaped, felt-fiber containers or nine wax-tested, cotton cloth, bag increments. Safety before firing is provided by a safety wire, which must be removed just before firing. a. This section discusses the characteristics and nomenclature of each component (Figure 4-2). Mortars are indirect-fire weapon systems. This is accomplished by depressing the barrel until the top of the mask is clear. Designed by Thingsym. Types of rounds, classification, and characteristics for the 81-mm mortar, M252. 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 . It can be set from 3 to 55 seconds at half-second intervals. The fuze threads and fuze well threads are inspected for damage. The superior flow characteristics of these BALL POWDER . Additionally, they carry the 81mm M252 mortar that can only be used in a dismounted capacity. . The safety/packing clip should be removed when the cartridge is unpacked. 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. Mount Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. ), 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).
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