81mm mortar range table

The standard infantry support weapon is the M-252 81mm mortar, which lobs a 10 lb. Short cartridges can be expected when firing below charge 4. 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 . 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 M819 cartridge (M252 only) has a cylindrical body and contains red phosphorus that produces white smoke on contact with air. Agreed that mortars should generally be used close to the frontline. (2) The breech plug is screwed tightly to the barrel. The types of fuzes described in this paragraph are point detonating, proximity, mechanical time, multioption, and dummy. He opens the cross-level handwheel, traversing handwheel, and barrel clamp. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. WP cartridges are stored with the fuze end up. The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. c. Mechanical Time. The fuze has a safety wire that must be removed before firing. An internal clock mechanism provides nine seconds of safe air travel (610 to 2,340 meters along trajectory for charge 0 through 9, respectively). Section I. (5) Four inches of elevation shaft are exposed, and the shaft is not bent. All mortar cartridges are painted to prevent rust and to identify their type. DESCRIPTION. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 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 floating firing pin located within the primer has approximately 1/16 of an inch to move around. Excess increments should not accumulate near the mortar positions but are removed to a designated place of burning and destroyed. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. 120MM Mortar System. (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. Any target that requires that elevation, or a lower one, cannot be engaged from that position. 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. 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 sight is laid on 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. Fired . OPERATOR`S MANUAL FOR MORTAR, 81-MM, M252 (NSN 1015-01-164-6651) (EIC 4SK){TM . Ammunition Lot Number. This is the inert PD fuze type "IR-81" used by the Italians for their 81mm mortar rounds during WWII. Red phosphorus rounds can be fired from the M29/M29A1 at a reduced charge (maximum charge = charge 2). b. 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. 0.50, BROWNING, M2; FIRING CARTRIDGE, ARMOR-PIERCING-INCENDIARY, CAL. 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. There must not be a visible gap between the fuze and cartridge body. The assistant gunner attempts to maintain the traversing mechanism on a horizontal plane. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. (2) The M84 fuze is a single-purpose, powder-train, mechanical-time fuze used with the 81-mm M301A1 and M301A2 illuminating cartridges. It weighs about 9.05 pounds. The section leader, acting as FDC, has one deflection instead of two or more. The mount consists of elevating and traversing mechanisms and a bipod (Figure 4-4). The M1 became the standard American . .50: BALL, M2 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR WEAPON, 5.56MM, M16A1 WEAPON, 5.56MM, M16A2 WEAPON, 5.56MM, M249 AND WEAPON, 5.56MM, M4 FIRING CARTRIDGE, BALL, M855 CARTRIDGE, TRACER, M858 CARTRIDGE, BALL, M193 CARTRIDGE, TRACER, M196 (S&I BY PROP SEE DETAILS, FOOTNOTES), MACHINE GUN, 7.62-MM: M60 ON MOUNT, MACHINE GUN: 7.62-MM, M122 AND MACHINE GUN, 7.62-MM: M73 ON TANK, COMBAT, FULL-TRACKED: 105-MM GUN, M60 SERIES AND RIFLE, 7.62-MM: M14; FIRING CARTRIDGE, 7.62-MM, BALL, NATO, M59; CARTRIDGE, 7.62-MM, BALL, NATO, M80; CARTRIDGE, 7.62-MM: AP, NATO, M61 AND CARTRIDGE, 7.62-MM: TRACER, NATO, M62 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), ADDENDUM TO FT 8-Q-1 FOR PROJECTILE, HE, M404 (S&I BY PROP SEE DETAILS, FOOTNOTES), ADDENDUM TO FT 8-J-4 FOR PROJECTILE, HE, M404 (S&I BY PROP SEE DETAILS, FOOTNOTES), ADDENDUM TO FT 8-T-1 FOR PROJECTILE, HE: M509A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER, M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED, 8-INCH, M110A2 FOR LOW ANGLE FIRING PROJECTILE, HE, M509A1 USING REGISTRATION DATA FOR PROJECTILE, HE, M106 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER: M2 AND M2A1 ON HOWITZER, HEAVY, TOWED: 8-INCH, M115; CANNON, 8-INCH HOWITZER: M47 ON HOWITZER, HEAVY, SELF-PROPELLED, FULL TRACKED: 8-INCH, M55; CANNON, 8-INCH HOWITZER: M2A1E1 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110; FIRING PROJECTILE, HE: M106 AND PROJECTILE, CHEMICAL: M426 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER, M201 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110A1 AND CANNON, 8-INCH HOWITZER, M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110A2 AND FIRING PROJECTILE, HE, M106 PROJECTILE, CHEMICAL, M426 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER: M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED, 8-INCH, M110A2; FIRING PROJECTILE, HE, RA; M650 AND PROJECTILE, ATOMIC: M753 AND M753A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 8-INCH HOWITZER, M201A1 ON HOWITZER, HEAVY, SELF-PROPELLED: 8-INCH, M110A2 FIRING PROJECTILE, HE, M509A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 14.5-MM GUN, M31; ARTILLERY TRAINER FIRING FUZED CARTRIDGES, M181, M182 AND M183 (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, 20-MM, AUTOMATIC, M139; FIRING CARTRIDGE, 20-MM, HEIT, M599; CARTRIDGE, 20-MM, TPT, M206 AND CARTRIDGE, 20-MM, APIT, M601 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR CANNON, 25MM GUN, M242 ON INFANTRY FIGHTING VEHICLE, M3 FIRING CARTRIDGE, APDS-T, M791 CARTRIDGE, HEI-T, M792 CARTRIDGE, TP-T, M793 CARTRIDGE, TPDS-T, M910 (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, AUTOMATIC, 40-MM, M1 AND GUN, DUAL AUTOMATIC, 40-MM, M2; FIRING CARTRIDGE, HE-T, SD, MK 2 WITH FUZES, PD, MK 27, M64A1, M71 OR NO. The M734 multioption fuze is the only one used with the 81-mm mortar. The round is still safe to handle and transport if the safety wire is reinserted. He maintains the ammunition for firing and provides local security for the mortar position. The cartridges are painted olive drab with yellow markings. The striker has been modified to be able to use German and Italian patterns of 81mm mortar . When a misfire occurs, any member of the squad immediately announces, "Misfire." Types of rounds, classification, and characteristics for the 81-mm mortar, M252. This cartridge is ballistically matched to the M374A2, M374A1, and M375 HE cartridges, and weighs about 9.12 pounds. Tabulated data. The M252 system . Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. The cartridge is dropped down the barrel, fin-end first. 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. 4-4. g. The barrel clamps can be moved along the barrel to counter large changes in elevation. 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 . These are NDI items . He exposes 1 inch (25 millimeters) of cross-level shaft and folds the handle. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. It uses the M219 propelling charge and weighs about 9.1 pounds. The pile is covered with a double thickness of tarpaulin. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. SMALL DEFLECTION AND ELEVATION CHANGES. Each cartridge weighs about 10 pounds and is provided with the M223 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. 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. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . The firing pin must be replaced and the bore swabbed. The cartridge weighs about 9.12 pounds. The traversing screw assembly is fitted to the clamp assembly, which is pivoted in the center on an arm attached to the elevating leg. (1) The M772A1 fuze is a MTSQ. Attached to the arm is the cross-leveling mechanism, which is attached to the clamp assembly at its upper end. This ensures a maximum traversing and elevating capability after making the movement. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. The M375 cartridge uses the M90 propelling charge while the M375A2 and M375A1 cartridges use the M90A1 propelling charge. The mortar is then re-laid on the aiming posts using the traversing crank. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. on Amazon.com. b. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. The barrel clamps are then closed. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. It engages the 1 3/4-inch flats on the setting ring or the fuze head. 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. When firing under the control of an FDC, he reports to the FDC that mask clearance cannot be obtained at a certain elevation. The leg-locking handwheel must then be tightened by hand, ensuring the teeth on either side are correctly meshed. M64A1 Sightunit. Those cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. The safety/packing clip should be removed when the cartridge is unpacked. (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. The M29 would become the standard American mortar in the upcoming Vietnam War. It is fitted with a standard pull wire and safety pin that are removed immediately before firing. He levels all bubbles. (2) Burn all dead grass or brush within 30 meters around the burning place. c. Crest Clearance. d. The ammunition is protected from mud, sand, dirt, and water. The mortar is within two turns of center of traverse. c. The first ammunition bearer checks the barrel and ensures that--. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. Home; Swifty. TM - Technical Manuals (Range 9) TM - Technical Manuals (Range 10) TM - Technical Manuals (Range 11-4) TM - Technical Manuals (Range 11-5) . High explosive--M821, M889, M374-series, and M362. (3) Markings on rounds. The following safety checks must be enforced before firing the mortar. The gunner is given a deflection change between 5 and 25 mils, either increasing or decreasing from the last stated deflection, and the command to refer and realign aiming posts. If the barrel is cool enough to handle, the crew removes the round as described below. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. During firing, the breech plug on the barrel is sealed and locked to the rotatable socket in the baseplate. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. 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. The gunner is given an administrative command to lay the mortar on a deflection of 2860 or 2740 mils. He moves the mortar until the vertical line of the sight is aligned approximately on the aiming post. Placing the mortar in position at night does not relieve the gunner of the responsibility of checking for mask clearance and overhead interference. During training, the gunner may use the driving stake from the aiming post case. These cartridges are used first in subsequent firing so that once-opened stocks can be kept to a minimum. (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay. 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 RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. 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. Secure .mil websites use HTTPS General Dynamics Ordnance and Tactical Systems is the leading manufacturer of propellants for 60mm, 81mm and 120mm Mortar Systems. It is used for records such as reports on condition, malfunctions, and accidents. He performs other duties as the squad leader directs. The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. Additionally, they carry the 81mm M252 mortar that can only be used in a dismounted capacity. d. Climatic Effects. The barrel is then rotated a quarter turn to unlock it from the socket, and it is placed in an area designated by the squad leader. 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 cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. a. 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 water is not available, the gunner must stand clear of the mortar until the barrel is cool. Figure 4-7. *FREE* shipping on qualifying offers. Upon completion of any bipod movement on the barrel, the gunner ensures that the firing pin recess is facing upward. Mount They contain about 2.10 pounds of composition B explosive. (1) The rotating socket is free to move in a complete circle. The entire squad stays with the mortar. As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition. Propelling charges are covered or protected from dampness or heat. It is set using the bladed end of the M18 fuze wrench. The ignition cartridge (with primer) is fitted into the base of the fin shaft. (4) The bipod locking latch is locked, securing the barrel clamps. 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). The fuze is set manually to proximity, point detonate, or delay modes. SQUAD AND SECTION ORGANIZATION AND DUTIES, Each member of the infantry mortar squad has principle duties and responsibilities. The fuze is nicely marked and is dated 1940. A safety latch located at the side of the recess is used to secure the ball. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. 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.

Record Power Dealers Near Me, Ratp Dev Self Service, British Airways Economy Standard Vs Premium Economy, Poteat Funeral Home Obituaries, Articles OTHER