If the barrel is cool enough to handle, the crew removes the round as described below. 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. (3) The circlip is correctly located, securing the rotating socket to the baseplate. 107 Army Pentagon Cartridges assembled with the M532 fuze must be fired above charge 0. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. It uses the M205 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. d. Climatic Effects. Designed by Thingsym. e. The squad leader picks up the aiming posts and sight. 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. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. Trenches are dug to prevent water from flowing under the pile. 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. This ensures a maximum traversing and elevating capability after making the movement. (d) Firing is slowed if mask clearance must be checked before each firing but this can be eliminated if minimum mask clearance is determined. Dropping may cause the propellant charges to ignite, causing bodily injuries. 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. This may cause the firing pin to ignite the charges if the cartridge is dropped on the fin end (. M64A1 Sightunit. They are painted light green with red markings and one narrow yellow band. The Mark 4 and 5 barrels were introduced during World War 2 and have a much increased range. Normally, it can be moved by hand, although this may be difficult to do if the mortar is moved through a large arc. General Dynamics Ordnance and Tactical Systems is the leading manufacturer of propellants for 60mm, 81mm and 120mm Mortar Systems. The cartridge is painted light green with black markings and one narrow brown band. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. 120MM Mortar System. Each squad member should be able to perform all the following premount checks: a. The first table is a chart that shows range and elevation for firing particular mortar shells. The M1 became the standard American . Ammunition is typed according to use (Table 4-2). DESCRIPTION. c. Authorized Cartridges. The cannon has a crew-removable breech plug and firing pin. To make the shift, the gunner places the fingers of his right hand in the muzzle and his left hand on the left leg. Baseplate placed against baseplate stake. The American M1 81mm Mortar, like the upcoming M2 60mm Mortar, was based on a French design by Edgar William Brandt (1880-1960). As soon as the sight data are announced, the gunner places it on the sight. It uses the M185 propelling charge that consists of eight increments fitted into the spaces between the fins and held by a propellant holder. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. High explosive is used for both fragmentation and blast effect against personnel and light-skinned vehicles. At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. ), 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). This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. A plain leg is fitted to a stud on the elevating leg and is secured by a leg-locking handwheel. An air cavity can form on one side of a cartridge to unbalance it, causing instability in flight. d. When the barrel reaches the horizontal position, and not before, the assistant gunner moves the thumb of each hand over the muzzle. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. Mount, M177, in folded position. The term "indirect fire" means firing at an enemy without having a. c. The first ammunition bearer checks the barrel and ensures that--. Theme by TechDoc. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. Its range and explosive power is greater than the M224, yet it is still light enough to be man . VERY NICE condition! The squad leader points to the exact spot where the mortar is to be mounted. a. Point-Detonating. 9301 Chapek Road., Bldg.1458 They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. 0.50, M8 (REPRINTED W/BASIC INCL C1-2) (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MOUNTED: MULTIPLE CALIBER .50 MACHINE GUN, M55 FIRING CARTRIDGE, CALIBER .50: API, M8 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: FICED, M85 TANK, COMBAT, FULL TRACKED: 105MM GUN, M60 SERIES FIRING CARTRIDGE, CALIBER .50: API, M8 CARTRIDGE, CALIBER .50: API-T M20 CARTRIDGE, CALIBER .50: BALL, M33 CARTRIDGE, CALIBER .50: TRACER, M17 (S&I BY PROP SEE DETAILS, FOOTNOTES), MACHINE GUN, CAL. The M29 would become the standard American mortar in the upcoming Vietnam War. Red phosphorus rounds can be fired from the M29/M29A1 at a reduced charge (maximum charge = charge 2). He has the duty of preparing the ammunition and passing it to the assistant gunner. When set at SQ, the fuze functions on point impact or graze contact. 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. The fuze is not intended to function at charge 0. The fuze is set manually to proximity, point detonate, or delay modes. Each cartridge weighs about 10 pounds and is provided with the M223 propelling charge, consisting of four horseshoe-shaped increments fitted around the tail. Additionally, they carry the 81mm M252 mortar that can only be used in a dismounted capacity. If the primer of the ignition cartridge is dented, the first ammunition bearer attempts to replace the safety wire and places the round in a marked, safe location for disposal by ordnance personnel. Disposal Precautions. (5) Four inches of elevation shaft are exposed, and the shaft is not bent. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. 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 M819 cartridge (M252 only) has a cylindrical body and contains red phosphorus that produces white smoke on contact with air. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. Identification. The explosive elements in primers and fuzes are sensitive to shock and high temperature. The gunner moves the mortar as the assistant gunner steadies it. The M751 is fitted with a smoke charge that operates on impact. He must not stand directly behind the mortar. high-explosive bomb at a range of about three miles. a. ), 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. c. The moisture-resistant seal of the container is broken when the ammunition is to be used. 4-4. The powder increments, mainly, should not be exposed to direct sunlight. (1) The M772A1 fuze is a MTSQ. The M751 fuze is the only dummy fuze used with the 81-mm mortar. 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 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. News. To convert the fuze from PROX to SQ/IMP, the top of the fuze must be rotated 120 degrees (one-third turn) in either direction. In charge was the platoon commander - normally a lieutenant. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. 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 safety/packing clip should be removed when the cartridge is unpacked. 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. Overhead interference can be branches of trees or roofs of buildings. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. It has no safety pins or wires to reduce preparation time. 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. Types of rounds, classification, and characteristics for the 81-mm mortar, M252. It is especially useful if the baseplate sinks deep into the ground during prolonged firing. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is The cartridge is painted olive drab with yellow markings. End this starting train with not less than 1 meter of inert material (dry grass, leaves, or newspapers). This cartridge is ballistically matched to the M374A2, M374A1, and M375 HE cartridges, and weighs about 9.12 pounds. An 81 mm mortar is a medium-weight mortar. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. He exposes 1 inch (25 millimeters) of cross-level shaft and folds the handle. c. The elevating shaft is contained in the elevating leg; to the left of the elevating leg is the elevating handwheel. (3) The M256-series fuze has an SQ/IMP function only. Referring and realigning aiming posts ensure that all mortars are set on the same data. b. SMALL DEFLECTION AND ELEVATION CHANGES. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 [US Army.] A lock ( Home; Swifty. 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). Fort Belvoir, VA 22060 Official websites use .mil 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. Agreed that mortars should generally be used close to the frontline. Section I. (2) The breech plug is screwed tightly to the barrel. Table 4-1. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. The M252 medium mortar offers a compromise between the light and heavy mortars. 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. 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. c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. Attached to the arm is the cross-leveling mechanism, which is attached to the clamp assembly at its upper end. Army Publishing Directorate (2) The ribs and braces have no breaks, cracks, or dents. Secure .mil websites use HTTPS It should be destroyed in accordance with standard procedures. The squad leader notifies the FDC of the minimum mask clearance elevation. The barrel clamp, which consists of an upper and lower clamp, is situated at the top. This is the inert PD fuze type "IR-81" used by the Italians for their 81mm mortar rounds during WWII. The cartridge is painted light green and has red markings and one narrow yellow band. The leg-locking handwheel must then be tightened, ensuring the teeth are correctly meshed. The 81mm mortar is a portable, mobile, medium mortar at the infantry's disposal. (1) Mask clearance and overhead clearance are sufficient. SQUAD AND SECTION ORGANIZATION AND DUTIES, Each member of the infantry mortar squad has principle duties and responsibilities. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. Mount 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. The fuzes may be used for day or night operations. The enemy will use them. (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. d. The first ammunition bearer stands to the right rear of the mortar. The first ammunition bearer holds the barrel until the assistant gunner has removed the mount. Several types of HE ammunition are used in the 81-mm mortar, M252. a. The increments are individually wrapped with waterproof bags that are not removed. A securing strap is attached to the plain leg for securing the bipod in the folded position. 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. That is generally how I use mortars. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. Weights (pounds) System (including basic issue items) Barrel (with blast attenuator device) Mount M3A1 Baseplate Ammunition is made and packed to withstand all conditions ordinarily encountered in the field. (2) The fin and fuze assembly must be checked for tightness and damage. 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. It is painted white with black markings. 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. b. The cartridge is dropped down the barrel, fin-end first. 81MM M252A1. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. d. The gunner recovers the baseplate to the area designated by the squad leader. 4-12. Propelling charges are covered or protected from dampness or heat. It provides illumination for about 60 seconds with 600,000 candlepower illumination. a. The pile is covered with a double thickness of tarpaulin. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. 0.50, BROWNING, M2; FIRING CARTRIDGE, ARMOR-PIERCING-INCENDIARY, CAL. M327 mortar is an extended range mortar system operated by Marine Corps Artillery Units. b. The fuze setter, M25, sets M84-series time fuzes. When set at delay, the fuze train causes a 0.05-second delay before functioning. 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 . 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 fuze is nicely marked and is dated 1940. 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. If it gets wet or dirty, it must be wiped off at once. MFCS Mounted. He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. (b) In selecting the exact mortar position, the leader looks quickly for mask clearance and overhead interference. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. The round is still safe to handle and transport if the safety wire is reinserted. 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. These propellants are flash-suppressed and clean burning resulting in minimum residue, flash and blast overpressure. The gunner should expose 6 inches (150 millimeters) of elevation shaft and center the buffer carrier. The assistant gunner attempts to maintain the traversing mechanism on a horizontal plane. The fuze has a safety wire that must be removed before firing. The muzzle end has a short tapered lead-in which acts as a . At the command, MARCH ORDER, the squad places the mortar, equipment, and ammunition in the squad vehicle and trailer.



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