b. Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. Ammunition is typed according to use (Table 4-2). a. (8) To help minimize the occurrence of short rounds and or duds, unpackaged ammunition that has been dropped should not be fired. 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 . This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. The obturating ring ensures equal muzzle velocities in hot or cold barrels by keeping all the gases in the barrel until the cartridge has fired. With the clamps facing away from him, the assistant gunner traverses the buffer carrier to the traversing handwheel and folds the handle. c. The first ammunition bearer ensures that each cartridge is clean, the safety pin is present, and the ignition cartridge is in good condition. 81 mm HE mortar projectiles generally contain anywhere between 400 g and 680 g of HE and have a maximum range of approximately 6,500 m. 82 mm HE mortar projectiles generally contain anywhere between 392 g and 680 g of HE and have maximum ranges of between 3,000 - 5,500 m. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. b. He exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. MC Medical Guide; Client-side mods; TFAR 1.x for players; It was even a tool used by airborne units, and was dropped in parachute bundles during Operations Neptune, Market Garden, and Varsity. a. Point-Detonating. This ensures a maximum traversing and elevating capability after making the movement. Several types of RP/WP ammunition are described herein. He stands to the rear of the baseplate and supports the barrel until the bipod is fitted. All elements given in the fire command are repeated by the squad. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. The fuze consists of a brass head, body assembly, and expelling charge. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. They are assembled with either an M524-series, M526-series, or M567 fuze. This round may be stored in a horizontal position. 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. ), 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). The propellant increments are ignited, which produce rapidly expanding gases that force the cartridge from the barrel. (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. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . The fuze has a safety wire that must be removed before firing. 107 Army Pentagon 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 fuze consists of a brass head, body assembly, and expelling charge. 81MM M252A1. a. e. The gunner centers the elevation bubble. The table on the right describes the three most common setups. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. He moves the mortar until the vertical line of the sight is aligned approximately on the aiming post. Long Range PGK. 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. If the round does not fire, the gunner tests the barrel for heat. The squad leader picks up the sight case and the two aiming posts, and moves to the exact position where the mortar is to be mounted. The mount consists of elevating and traversing mechanisms and a bipod (Figure 4-4). Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. 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 baseplate (Figure 4-5) is of one-piece construction, and supports and aligns the mortar for firing. The elevation change announced must be less than 90 mils and more than 35 mils. It uses the M219 propelling charge and weighs about 9.1 pounds. Its range and explosive power is greater than the M224, yet it is still light enough to be man . c. The moisture-resistant seal of the container is broken when the ammunition is to be used. The floating firing pin located within the primer has approximately 1/16 of an inch to move around. MFCS Dismounted. The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. Army Publishing Directorate In charge was the platoon commander - normally a lieutenant. Barrel (with blast attenuator device) The ignition cartridge strikes the firing pin and detonates, which causes a flash that passes through the radial holes in the shaft. As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition. The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is A .mil website belongs to an official government organization in the United States. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. Both legs are fitted with a disk-shaped foot with a spike beneath to prevent the mount from slipping. Overhead interference can be branches of trees or roofs of buildings. Secure .mil websites use HTTPS 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. (c) The gunner determines mask and overhead clearance by sighting along the barrel with his eye near the breech plug. .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. Short cartridges can be expected when firing below charge 4. DESCRIPTION. The M29 would become the standard American mortar in the upcoming Vietnam War. 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. It arms within a maximum of 2.50 seconds. MFCS Mounted. 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 gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel. g. The barrel clamps can be moved along the barrel to counter large changes in elevation. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. The squad leader stands behind the mortar where he can command and control his squad. The M375 cartridge uses the M90 propelling charge while the M375A2 and M375A1 cartridges use the M90A1 propelling charge. a. The assistant gunner cleans the bore and swabs it dry. The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. The squad leader notifies the FDC of the minimum mask clearance elevation. The cartridge weighs about 9.12 pounds. 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 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. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. Notches in the setter engage ribs in the setting ring of the fuze. The first ammunition bearer holds the barrel until the assistant gunner has removed the mount. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. Excess increments should not accumulate near the mortar positions but are removed to a designated place of burning and destroyed. The fuze threads and fuze well threads are inspected for damage. Dropping may cause the propellant charges to ignite, causing bodily injuries. The M252 81mm medium extended range mortar (see diagram below) is a crew-served, smooth bore, muzzle loaded, high angle of fire weapon system. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. To dismount the mortar, the squad leader commands, OUT OF ACTION. High explosive is used for both fragmentation and blast effect against personnel and light-skinned vehicles. There is a selector on the lower shaft for non-delay or delay impact action. The cartridge uses the M205 propelling charge and is assembled with the M567 or M524-series fuze. f1 performance coach salary,