81mm mortar range table 81mm mortar range table

(2) The fin and fuze assembly must be checked for tightness and damage. The cartridge is painted light green and has red markings and one narrow yellow band. b. a. b. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. He positions the lower barrel clamp against the lower stop band on the barrel and secures the upper barrel clamp. 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. 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. Safety before firing is provided by a safety wire, which must be removed just before firing. e. The squad leader picks up the aiming posts and sight. f. Installation. The standard infantry support weapon is the M-252 81mm mortar, which lobs a 10 lb. Tabular Firing Tables TFT ORDER FORM 1.Select "Mortar" 2.Select which mortar caliber 3.Select mortar system nomenclature 4.Select which TFTs to order 5.Put in quantity and click "Add TFTs" 6.Click "Next" TFT JUSTIFICATION 1.Put in TFT Ordering Justification 2.Click "Next" SHIPPING INFORMATION 1.Fill out all required fields The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. The M821/M889 are 81mm HE Mortar Cartridges. Red phosphorus/white phosphorus--M819 and M375-series. e. The pull wire and safety wire are removed from the fuze just before firing. LHMBC. The firing pin must be replaced and the bore swabbed. 107 Army Pentagon The safety/packing clip should be removed when the cartridge is unpacked. These propellants are flash-suppressed and clean burning resulting in minimum residue, flash and blast overpressure. It uses the M772 mechanical time fuze and weighs about 10.6 pounds. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. The superior flow characteristics of these BALL POWDER . It is used for records such as reports on condition, malfunctions, and accidents. The terms cannon and barrel are used interchangeably in this chapter. Red phosphorus cartridges (M252 only) are stored the same as HE cartridges. When the approximate alignment is completed, the gunner signals the assistant gunner to lower the bipod by pushing down on the mortar. He places firing data on the sight and lays the mortar for deflection and elevation. The M1 became the standard American . Additional information is included on an ammunition data card inside each container. He performs other duties as the squad leader directs. 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. (2) The barrel is locked to the baseplate, and the open end of the socket points in the direction of fire. Table 4-1. The fuze setter, M25, sets M84-series time fuzes. Theme by TechDoc. Joint Tables of Allowance; PB - Professional Bulletins; STP - Soldier Training Publications; TC - Training Circulars; . After the rounds have been removed, they should always be handled with two hands to prevent accidental dropping. 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 muzzle end has a short tapered lead-in which acts as a . DESCRIPTION. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. He is also the squad driver. More uniform firing is obtained if ammunition is kept at the same temperature. The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. Long Range PGK. They are painted light green with red markings and one narrow yellow band. The contents of ammunition containers are shown by markings. In any case, the gunner must ensure that the cartridge does not strike an obstacle. During firing, the breech plug on the barrel is sealed and locked to the rotatable socket in the baseplate. b. 81MM M252A1. Notches in the setter engage ribs in the setting ring of the fuze. A .mil website belongs to an official government organization in the United States. a. When fired, the cartridge carries the ignition cartridge with it, leaving the mortar ready for the next cartridge. c. Mechanical Time. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. It weighs about 9.05 pounds. The fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. 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 RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. Cartridges assembled with the M532 fuze must be fired above charge 0. This section discusses the characteristics and nomenclature of each component (Figure 4-2). Firing tables are used to determine the correct charge for firing. The M374 cartridge is fitted with the M90 propelling charge. When firing under the control of an FDC, he reports to the FDC that mask clearance cannot be obtained at a certain elevation. The cartridge is painted light green with black markings and one narrow brown band. Bear in mind that these are my personal opinions, experiences, and . At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. Training practice is used only for training. Short cartridges can be expected when firing below charge 4. A locked padlock However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. e. Care, Handling, and Preservation. 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 first ammunition bearer puts both hands on the cooling fins under the barrel and slowly lifts the barrel until it is horizontal. Red phosphorus rounds can be fired from the M29/M29A1 at a reduced charge (maximum charge = charge 2). 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. (4) The bipod locking latch is locked, securing the barrel clamps. 4-10. The explosive elements in primers and fuzes are sensitive to shock and high temperature. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. REFER DEFLECTION TWO EIGHT SEVEN FIVE (2875), REALIGN AIMING POSTS. on Amazon.com. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. (d) Firing is slowed if mask clearance must be checked before each firing but this can be eliminated if minimum mask clearance is determined. There must not be a visible gap between the fuze and cartridge body. In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. The cartridge is dropped down the barrel, fin-end first. One-quarter turn on the adjusting nut equals one turn of the traversing handwheel. The gunner is given a deflection change in a fire command between 20 and 60 mils inclusive. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. The lower clamp is shaped and bored on each side to house the buffer cylinders. On its right side, the clamp is recessed to receive the ball end of the locking rod. Before the mortar is mounted, the squad must perform premount checks. The cartridge can be fitted with the M524-series, M526-series, M567, or M532 fuzes. (3) The M256-series fuze has an SQ/IMP function only. 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 it gets wet or dirty, it must be wiped off at once. f. The open end of the socket must continue to point in the direction of fire. The following are authorized (Standard B) cartridges for the 81-mm mortar, M252: Each cartridge has fins around the tail to stabilize it in flight and to cause it to strike fuze-end first. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. The gunner places the outer edge of the baseplate against the baseplate stake so that the left edge of the cutaway portion of the baseplate is aligned with the right edge of the stake (Figure 4-7). Mount, M177, in folded position. In charge was the platoon commander - normally a lieutenant. The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is While the assistant gunner supports the barrel, the gunner slackens the leg-locking handwheel, releases the locating catch, and positions the plain leg. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. Then he relocks the barrel clamp. This document (FT 81 B3, abridged) consists of two pages, each with a separate table. The assistant gunner checks the bipod and ensures that--. Short cartridges can be expected when firing below charge 4. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9. Prev - Mk6 Mortar range table for charge 0 Next - Mk6 Mortar range table for charge 2 . b. .50 MACHINE GUN, M3; FIRING CARTRIDGE, CAL. . He stands to the rear of the baseplate and supports the barrel until the bipod is fitted. Several types of HE ammunition are used in the 81-mm mortar, M252. The gunner is given an administrative command to lay the mortar on a deflection of 2860 or 2740 mils. 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. As soon as the sight data are announced, the gunner places it on the sight. 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. 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 . The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. This may cause the firing pin to ignite the charges if the cartridge is dropped on the fin end (. At the muzzle end is a cone-shaped blast attenuator device (BAD) that is fitted to reduce noise. Each cartridge weighs about 10 pounds and is provided with the M223 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. General Dynamics Ordnance and Tactical Systems' 81mm Roll Controlled Guided Mortar (RCGM) provides an affordable, flexible solution to meet that need. (See FM 7-90 for a discussion of the duties of the platoon headquarters.). The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. The mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. If water is not available, the gunner must stand clear of the mortar until the barrel is cool. The platoon leader commands the platoon and supervises the training of the elements. .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. Its range and explosive power is greater than the M224, yet it is still light enough to be man . It is set using the bladed end of the M18 fuze wrench. a. The M1 was a derivative of the French mle 27/31 system (itself an improved form of the Stokes Trench Mortar of World War 1 fame) and slightly altered to suit American needs. To dismount the mortar, the squad leader commands, OUT OF ACTION. Safety before firing is provided by a safety wire, which must be removed just before firing. 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. 0.50, BROWNING, M2; FIRING CARTRIDGE, ARMOR-PIERCING-INCENDIARY, CAL. d. The first ammunition bearer stands to the right rear of the mortar. .30, BROWNING, M1919A4 AND M2 (HEAVY BARREL), .30, M2 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE: CAL. VERY NICE condition! 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 . The types of fuzes described in this paragraph are point detonating, proximity, mechanical time, multioption, and dummy. The upper clamp is fitted with a locking arrangement that consists of a curved handle and a spring-loaded locking rod, which is ball-shaped at its lower end. b. (8) To help minimize the occurrence of short rounds and or duds, unpackaged ammunition that has been dropped should not be fired. The safety pull wire is removed just before inserting the cartridge into the mortar. (4) The leg-locking handwheel is hand tight. a. b. 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. Fired . He has the duty of preparing the ammunition and passing it to the assistant gunner. M327 mortar is an extended range mortar system operated by Marine Corps Artillery Units. MFCS Mounted. It can provide all-weather, ground-based, close supporting, accurate, immediately M3A1 Baseplate After the mortar is mounted, the gunner makes a thorough check. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. It is fitted with a safety wire and pin that are removed immediately before firing. (2) The breech plug is screwed tightly to the barrel. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. 0.30, BROWNING, M1919A4, M1919A5 AND M1919A6 {TO 39A-5 AF-32} (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE, CAL. The mortar is then re-laid on the aiming posts using the traversing crank. 120MM Mortar System. *FREE* shipping on qualifying offers. Training practice--M879, M880, M68, and sabot. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 9301 Chapek Road., Bldg.1458 See Chapter 3, paragraph 3-14 for a detailed discussion of malfunctions. Powered by Hugo. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. I say 120s are bad because they suffer from terrible dispersion even when not shooting at 6km. Figure 4-7. The following safety checks must be enforced before firing the mortar. b. 60MM M224A1. News. This is accomplished by depressing the barrel until the top of the mask is clear. 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. 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. 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 . The cartridge must not be fired below charge 3. WP cartridges are stored with the fuze end up. As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition. Figure 4-4. 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. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. No tools are needed to set the fuze, and the setting can be changed several times without damaging the fuze. 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. a. 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. b. It has a time setting of up to 25 seconds. It is especially useful if the baseplate sinks deep into the ground during prolonged firing. If he is not within 20 mils, the gunner and assistant gunner must make another large shift before moving on. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. They contain about 2.10 pounds of composition B explosive. a. Point-Detonating. This section implements STANAG 2321 and QSTAG 900 (Edition 1). 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. End this starting train with not less than 1 meter of inert material (dry grass, leaves, or newspapers). The fuze is nicely marked and is dated 1940. d. The gunner recovers the baseplate to the area designated by the squad leader. It has a time setting of up to 50 seconds. (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. A securing strap is attached to the plain leg for securing the bipod in the folded position. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. Excess increments should not accumulate near the mortar positions but are removed to a designated place of burning and destroyed. The baseplate (Figure 4-5) is of one-piece construction, and supports and aligns the mortar for firing. Barrel (with blast attenuator device) CANNON . Additionally, they carry the 81mm M252 mortar that can only be used in a dismounted capacity. b. .50: AP, M2 AND CARTRIDGE, CAL. It uses the M185 propelling charge that consists of eight increments fitted into the spaces between the fins and held by a propellant holder. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. h. Where the ground is uneven and there is no level surface for the bipod, the gunner can adjust the plain leg. 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. He levels all bubbles. This may preclude moving the bipod. Once set to act as an impact fuze, the mechanism cannot be reset for PROX. These are NDI items . Attached to the right of the screw is the traversing handwheel. . (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. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. Correct way to open an ammunition box. When a large number of cartridges are needed for a mission, they may be removed from the containers and prepared. XM1210. d. The ammunition is protected from mud, sand, dirt, and water. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. The equipment is placed out the same as for the gunner's examination (Chapter 9). Those cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. Each squad member should be able to perform all the following premount checks: a. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. The M29 would become the standard American mortar in the upcoming Vietnam War. Mount The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. He lays for deflection, taking the proper sight picture. Section I. (5) Do not leave unused increments unburned in combat operational areas. He must not stand directly behind the mortar. The M751 fuze is the only dummy fuze used with the 81-mm mortar. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. Dropping may cause the propellant charges to ignite, causing bodily injuries. The second ammunition bearer retrieves the aiming posts. The pile is covered with a double thickness of tarpaulin. 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. Since phosphorus liquefies at about 100 degrees Fahrenheit, the ammunition is protected against an uneven rehardening of the filler. (2) The ribs and braces have no breaks, cracks, or dents. The gunner then kicks the barrel several times with his heel in an attempt to dislodge the round. 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. He places the sight case and aiming posts to the left front of the mortar position. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. M64A1 Sightunit. Normally, it can be moved by hand, although this may be difficult to do if the mortar is moved through a large arc. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the I have included my order history, detailed photos, as well as my personal opinion on International Military Antiques, IMA -USA www.ima-usa.com 81mm Display Mortar that they have for sale. (5) Four inches of elevation shaft are exposed, and the shaft is not bent. The M374A2 and M374A1 cartridges are fitted with the M90A1 propelling charge. It can be set from 3 to 55 seconds at half-second intervals. b. The propelling charge consists of an ignition cartridge and removable propellant increments.