The safety wire must be removed before firing. The M252 system . Fort Belvoir, VA 22060 Fuzes are not disassembled. 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 propelling charge is contained in four horseshoe-shaped, felt-fiber containers or nine wax-tested, cotton cloth, bag increments. They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. d. The ammunition is protected from mud, sand, dirt, and water. a. If water is not available, the gunner must stand clear of the mortar until the barrel is cool. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. (4) The bipod locking latch is locked, securing the barrel clamps. d. Climatic Effects. The mortar is within two turns of center of traverse. e. Dummy. This cartridge is ballistically matched to the M374A2, M374A1, and M375 HE cartridges, and weighs about 9.12 pounds. The mortar squad consists of five men (Figure 4-1). To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. The M375 cartridge uses the M90 propelling charge while the M375A2 and M375A1 cartridges use the M90A1 propelling charge. c. The elevating shaft is contained in the elevating leg; to the left of the elevating leg is the elevating handwheel. M327 mortar is an extended range mortar system operated by Marine Corps Artillery Units. Do not burn increments in piles but spread them in a train 1 to 2 inches deep, 4 to 6 inches wide, and as long as necessary. Placing the mortar in position at night does not relieve the gunner of the responsibility of checking for mask clearance and overhead interference. It is assembled with the M772A1 MTSQ. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. *FREE* shipping on qualifying offers. Official websites use .mil WP cartridges are stored with the fuze end up. Then it is removed from the bipod and laid horizontally on the ground at the dud pit until it can be turned over to ordnance personnel. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 They contain about 2.10 pounds of composition B explosive. All PD fuzes are superquick--detonate on impact. [Firing and Deflection Conversion Tables] - The Portal to Texas History Section I. Swifty 3 from scratch; Swifty 3 split-repo setup; Swifty Troubleshooting; Mods. The M252 medium mortar offers a compromise between the light and heavy mortars. 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. 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. He performs other duties as the squad leader directs. This section discusses the. The leg-locking handwheel must then be tightened, ensuring the teeth are correctly meshed. a. Point-Detonating. Bear in mind that these are my personal opinions, experiences, and . b. 90th IDPG IMA 81mm Mortar Review The gunner then kicks the barrel several times with his heel in an attempt to dislodge the round. They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. The Marines' Trusty Mortar Is Getting a Major Upgrade - Popular Mechanics high-explosive bomb at a range of about three miles. Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. Referring and realigning aiming posts ensure that all mortars are set on the same data. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. An internal clock mechanism provides nine seconds of safe air travel (610 to 2,340 meters along trajectory for charge 0 through 9, respectively). The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. M252 81mm Medium Mortar The squad leader notifies the FDC of the minimum mask clearance elevation. Baseplate placed against baseplate stake. The cartridge weighs about 9.4 pounds. In any case, the gunner must ensure that the cartridge does not strike an obstacle. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. The terms cannon and barrel are used interchangeably in this chapter. It has no safety pins or wires to reduce preparation time. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. There is a selector on the lower shaft for non-delay or delay impact action. The table on the right describes the three most common setups. Examples are: a. c. Mechanical Time. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. The first table is a chart that shows range and elevation for firing particular mortar shells. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. This may preclude moving the bipod. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. c. The gunner grasps both ends of the traverse screw assembly and supports the mortar during the subsequent drill. (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. . 4-4. He positions the lower barrel clamp against the lower stop band on the barrel and secures the upper barrel clamp. The cannon has a crew-removable breech plug and firing pin. Illuminating is used for battlefield illumination and signaling. Once set to act as an impact fuze, the mechanism cannot be reset for PROX. Designed by Thingsym. Maximum Range (meters): 7,240 (with standard fuze) . This ensures a maximum traversing and elevating capability after making the movement. Disposal Precautions. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. Notches in the setter engage ribs in the setting ring of the fuze. (703) 614-3727, Office of the Chief Information Officer 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. 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. He has the duty of preparing the ammunition and passing it to the assistant gunner. M29, 81mm Mortar - Military Factory These are NDI items . The elevation change announced must be less than 90 mils and more than 35 mils. The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. Training practice--M879, M880, M68, and sabot. This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. b. When set at delay, the fuze train causes a 0.05-second delay before functioning. The American M1 81mm Mortar, like the upcoming M2 60mm Mortar, was based on a French design by Edgar William Brandt (1880-1960). Following the arm-and-hand signals of the gunner (who is looking through the sight unit), he moves the far aiming post so that the gunner obtains an aligned sight picture. The cartridge must not be fired below charge 3. 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. Dropping may cause the propellant charges to ignite, causing bodily injuries. 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 mortar is then re-laid on the aiming posts using the traversing crank. (1) The rotating socket is free to move in a complete circle. Washington DC 20310-0107, ADRP - Army Doctrine References Publications, ATTP - Army Tactics, Techniques, and Procedures, FY Publication Status Report (CAC required for access), Publishing Resources (CAC required for access), PC/PCO/FMO/EPCO Directory (CAC required for access), usarmy.pentagon.hqda-apd.mbx.customer-service@army.mil, GUN, MACHINE, CAL. The 81mm Mortar - The David of Modern Warfare | SOFREP However, since explosives are affected by moisture and high temperature, they must be protected. Red phosphorus/white phosphorus--M819 and M375-series. Army Publishing Directorate MORTAR RANGE: 500M X 100M X: FIELD TRAINING AREA 40000 Sq Ft: X STORAGE BUILDING, GENERAL PURPOSE, INSTALLATION: Area to store excess equipment X: ORGANIZATIONAL STORAGE BUILDING Arms room for Mortar equipment: X . (4) The leg-locking handwheel is hand tight. It was even a tool used by airborne units, and was dropped in parachute bundles during Operations Neptune, Market Garden, and Varsity. He maintains the ammunition for firing and provides local security for the mortar position. 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. b. The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. One-quarter turn on the adjusting nut equals one turn of the traversing handwheel. Mk6 Mortar range table for charge 1 - Arma Docs for MC - Misfit Company This section discusses the characteristics and nomenclature of each component (Figure 4-2). The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. b. 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. b. (5) Do not leave unused increments unburned in combat operational areas. The explosive elements in primers and fuzes are sensitive to shock and high temperature. Attached to the arm is the cross-leveling mechanism, which is attached to the clamp assembly at its upper end. 81 mm mortar - Wikipedia This document (FT 81 B3, abridged) consists of two pages, each with a separate table. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. It weighs about 9.05 pounds. Agreed that mortars should generally be used close to the frontline. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. LARGE DEFLECTION AND ELEVATION CHANGES. That is generally how I use mortars. He indicates the initial direction of fire by pointing in that direction and commands ACTION. It can be set from 3 to 55 seconds at half-second intervals. SQUAD AND SECTION ORGANIZATION AND DUTIES, Each member of the infantry mortar squad has principle duties and responsibilities. The BAD is removed only by qualified maintenance personnel. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. The following safety checks must be enforced before firing the mortar. 81mm Roll Controlled Guided Mortar (RCGM) - General Dynamics Ordnance It can be fitted with either the M567, M524, or M532-series fuzes. . Long Range PGK. (6) The primer cartridge is checked for damage or dampness. The firing pin must be replaced and the bore swabbed. .50 MACHINE GUN, M3; FIRING CARTRIDGE, CAL. If he is not within 20 mils, the gunner and assistant gunner must make another large shift before moving on. The traversing screw assembly is fitted to the clamp assembly, which is pivoted in the center on an arm attached to the elevating leg. Figure 4-7. The fuze is nicely marked and is dated 1940. To dismount the mortar, the squad leader commands, OUT OF ACTION. Firing tables are used to determine the correct charge for firing. The muzzle end has a short tapered lead-in which acts as a . 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. He exposes 1 inch (25 millimeters) of cross-level shaft and folds the handle. The cartridge is painted light green with black markings and one narrow brown band. 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. The platoon leader commands the platoon and supervises the training of the elements. Table 4-1. With standard mortar, the maximum effective range is close to 4,000 metres; with a long-range system, this increases to nearly 4,500 metres. It has a time setting of up to 25 seconds. 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. News. The mount consists of elevating and traversing mechanisms and a bipod (Figure 4-4). d. The first ammunition bearer stands to the right rear of the mortar. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. 81mm, 82 mm & 120 mm Medium and Heavy Mortars - GICHD 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). Short cartridges can be expected when firing below charge 4. Range Minimum to maximum 83 to 5,608 meters Rate of Fire . It uses the M772 mechanical time fuze and weighs about 10.6 pounds. CANNON . Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. The vertical cross line of the sight is on the left edge of the aiming point. As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition. It can provide all-weather, ground-based, close supporting, accurate, immediately Overhead interference can be branches of trees or roofs of buildings. .50: AP, M2 AND CARTRIDGE, CAL. These propellants are flash-suppressed and clean burning resulting in minimum residue, flash and blast overpressure. b. Both legs are fitted with a disk-shaped foot with a spike beneath to prevent the mount from slipping. 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. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. PDF Introduction to Crew Served Weapons B3m4078 Student Handout c. The M374A3 HE cartridge is constructed from pearlitic malleable cast iron and contains about 2.10 pounds of composition B explosive. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. e. The pull wire and safety wire are removed from the fuze just before firing. High angles of approach (near vertical) give the lowest burst heights. Safety before firing is provided by a safety wire, which must be removed just before firing. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. Despite its weight though, the 81mm mortar was an important part of the Table of Organization and Equipment of U.S. Army and U.S. Marine Corps maneuver battalions throughout World War II. The components of the mortar consist of a cannon, mount, and baseplate. It contains white phosphorus that produces white smoke on contact with air. 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, HE, M795 PROJECTILE, HE, M795 IM PROJECTILE, HE, M1122 PROJECTILE, IR ILLUMINATING, M1123 PROJECTILE, ILLUMINATING, M1124 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 DETAILS, FOOTNOTES) . M821/M889 81mm HE Mortar Cartridges - GlobalSecurity.org He uses the chain of command to assist him in effecting his command and supervising duties. b. It is used for records such as reports on condition, malfunctions, and accidents. However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. The safety pull wire is removed just before inserting the cartridge into the mortar. If the round does not fire, the gunner tests the barrel for heat. 0.50, BROWNING, M2; FIRING CARTRIDGE, ARMOR-PIERCING-INCENDIARY, CAL. 60mm, 81mm, and 120mm Mortar Increments with Ball Powder Propellants 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. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. e. The assistant gunner passes the round to the first ammunition bearer who inspects it for the cause of the misfire. The second page includes a chart with range and deflection (presumably for the same kind of shells), as well as notes which give additional instructions. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. Training practice is used only for training. There must not be a visible gap between the fuze and cartridge body. He places firing data on the sight and lays the mortar for deflection and elevation. f. If the above procedure fails to remove the misfire, the barrel must be kept horizontal. on Amazon.com. HE ammunition is used against personnel and materiel. 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. e. Care, Handling, and Preservation. Those cartridges assembled with the M524 (A1, A2, A3, or A4) fuze are for use by the US Marine Corps and US Navy only. SMALL DEFLECTION AND ELEVATION CHANGES. Home; Swifty. The M252 is highly accurate up to ranges of 4500m to 5700m depending on the Cartridges assembled with the M532 fuze must be fired above charge 0. The M29 would become the standard American mortar in the upcoming Vietnam War. (3) From this train, extend a starting train that will burn against the wind of single increments laid end to end. 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 9301 Chapek Road., Bldg.1458 c. Crest Clearance. Joint Tables of Allowance; PB - Professional Bulletins; STP - Soldier Training Publications; TC - Training Circulars; . M3A1 Baseplate Its range and explosive power is greater than the M224, yet it is still light enough to be man . (2) The M84 fuze is a single-purpose, powder-train, mechanical-time fuze used with the 81-mm M301A1 and M301A2 illuminating cartridges. The gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel. From introduction up to halfway World War 2 the ML 3-inch had a poor range of up to 1.45 km. He must ensure that the ball-shaped end of the locking rod is secured in its recess by the locking latch. The mortar is within two turns of center of traverse. Short cartridges can be expected when firing below charge 4. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. b. An official website of the United States government. The gunner moves the mortar as the assistant gunner steadies it. Mortar, 81mm M1 - Military Factory 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. (2) The ribs and braces have no breaks, cracks, or dents. Several types of RP/WP ammunition are described herein. If the mortar section is to operate quickly and effectively in accomplishing its mission, mortar squad members must be proficient in individually assigned duties. A safety latch located at the side of the recess is used to secure the ball. He must not stand directly behind the mortar. In the U.S. Army and U.S. Marine Corps, it is normally deployed in the mortar platoon of an infantry battalion. 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 . If it gets wet or dirty, it must be wiped off at once. The section leader, acting as FDC, has one deflection instead of two or more. The ignition cartridge strikes the firing pin and detonates, which causes a flash that passes through the radial holes in the shaft. The components of the mortar consist of a canon, sight, mount, and baseplate. b. The gunner checks the baseplate and ensures that--. . The fuze body is graduated from 0 to 25 seconds in 1-second intervals; 5-second intervals are indicated by bosses. On its right side, the clamp is recessed to receive the ball end of the locking rod. (1) The M772A1 fuze is a MTSQ. Secure .mil websites use HTTPS The M374A2 and M374A1 cartridges are fitted with the M90A1 propelling charge. a. The M1 became the standard American . The squad leader indicates the direction of fire when mounting. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self The mortar should be within two turns of center of traverse when the task is compete. c. The moisture-resistant seal of the container is broken when the ammunition is to be used. The superior flow characteristics of these BALL POWDER . At this command, the squad proceeds as follows: a. He rotates the socket so that the open end is pointing in the direction of fire. 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. b. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. The pile is covered with a double thickness of tarpaulin. The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. 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. He levels all bubbles. 50mm? 60mm? 80mm? A guide on picking the right mortar for you
Ray Ban Blue Frame Sunglasses, Padres De Cosculluela Millonarios, Gorilla Hemp Energy Drink Stock, List Of Jack Nicklaus Caddies, Hamilton Home Builders Lynn Alabama, Articles OTHER