b. a. Training practice--M879, M880, M68, and sabot. f. If the above procedure fails to remove the misfire, the barrel must be kept horizontal. .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. Baseplate placed against baseplate stake. b. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. If the round fires, the mortar is re-laid on the aiming point and firing is continued. He moves the mortar until the vertical line of the sight is aligned approximately on the aiming post. It is a 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. To dismount the mortar, the squad leader commands, OUT OF ACTION. ), 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). b. He exposes 1 inch (25 millimeters) of cross-level shaft and folds the handle. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. 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. 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 . Bear in mind that these are my personal opinions, experiences, and . 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 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. .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MTD: MULTIPLE CAL. Table 4-3. It comes preset to function on SQ/IMP, and the selector slot should align with the SQ mark on the ogive. Notches in the setter engage ribs in the setting ring of the fuze. Disposal Precautions. An internal clock mechanism provides nine seconds of safe air travel (610 to 2,340 meters along trajectory for charge 0 through 9, respectively). MC Medical Guide; Client-side mods; TFAR 1.x for players; Both the 60mm and 120mm mortar rounds use White Phosphorus. To set for delay, the selector slot should be rotated clockwise until it is aligned with the "D" mark on the ogive. Short cartridges can be expected when firing below charge 4. This section implements STANAG 2321 and QSTAG 900 (Edition 1). b. f. The open end of the socket must continue to point in the direction of fire. He exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. How the RCGM works: Target coordinates are programed into the RCGM using a portable GPS setter. This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. . Complete cartridges are always handled with care. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. The components of the mortar consist of a cannon, mount, and baseplate. It is light enough to be portable when broken down into. The increments are individually wrapped with waterproof bags that are not removed. The superior flow characteristics of these BALL POWDER . 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.
81 mm mortar - Wikipedia The gunner removes the sight and places it in the case with 3200 deflection and 0800 elevation indexed. Other armies count on 81mm mortar families. Powered by Hugo. The air burst over average types of soil ranges from 1 to 6 meters, depending on the angle of approach. Swifty 3 from scratch; Swifty 3 split-repo setup; Swifty Troubleshooting; Mods. Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. The M252 81mm mortar is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. Then he relocks the barrel clamp. 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. An official website of the United States government. TM - Technical Manuals (Range 9) TM - Technical Manuals (Range 10) TM - Technical Manuals (Range 11-4) TM - Technical Manuals (Range 11-5) . 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. M327 mortar is an extended range mortar system operated by Marine Corps Artillery Units. d. Climatic Effects. The squad leader notifies the FDC of the minimum mask clearance elevation. 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. This is accomplished by depressing the barrel until the top of the mask is clear. The components of the mortar consist of a canon, sight, mount, and baseplate. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes.
M252 81mm Medium Extended Range Mortar - Federation of American Scientists Ammunition is made and packed to withstand all conditions ordinarily encountered in the field. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. The following safety checks must be enforced before firing the mortar. All elements given in the fire command are repeated by the squad. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. REFERRING OF THE SIGHT AND REALIGNMENT OF AIMING POSTS USING M64 SIGHT. The term "indirect fire" means firing at an enemy without having a. The American M1 81mm Mortar, like the upcoming M2 60mm Mortar, was based on a French design by Edgar William Brandt (1880-1960). 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. 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 same procedure for aligning the far aiming post is used to align the near aiming post. On its right side, the clamp is recessed to receive the ball end of the locking rod. He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. The round is still safe to handle and transport if the safety wire is reinserted. This ensures that the mortar does not fire should the round slip down the barrel during the subsequent drills. 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. 120MM Mortar System. b. Agreed that mortars should generally be used close to the frontline. General Dynamics Ordnance and Tactical Systems is the leading manufacturer of propellants for 60mm, 81mm and 120mm Mortar Systems. Theme by TechDoc. c. Mechanical Time. 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. It has two types: type 1 resembles the M734 fuze, and type 2 resembles the M935 fuze. The gunner moves the mortar as the assistant gunner steadies it. 107 Army Pentagon
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.
50mm? 60mm? 80mm? A guide on picking the right mortar for you The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. The 81mm weapons platoon consisted of the headquarters platoon and four mortar squads.
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.
FM 23-90 Chptr 4 81-mm Mortar, M252 - GlobalSecurity.org Red phosphorus/white phosphorus--M819 and M375-series. (2) The M84 fuze is a single-purpose, powder-train, mechanical-time fuze used with the 81-mm M301A1 and M301A2 illuminating cartridges. The M734 multioption fuze is the only one used with the 81-mm mortar. 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. After the mortar is mounted, the gunner makes a thorough check. They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. He places the sight case and aiming posts to the left front of the mortar position. It was even a tool used by airborne units, and was dropped in parachute bundles during Operations Neptune, Market Garden, and Varsity. The firing pin must be replaced and the bore swabbed.
M252 mortar - Wikipedia a. The platoon leader commands the platoon and supervises the training of the elements. When a misfire occurs, any member of the squad immediately announces, "Misfire." The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. Before the mortar is mounted, the squad must perform premount checks. If the fuze does not function as set, it automatically functions at the next lower setting. If the barrel is cool enough to handle, the crew removes the round as described below. 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. c. Crest Clearance. Figure 4-8. 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 . System (including basic issue items)
The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. Short cartridges can be expected when firing below charge 4. The principal factors affecting height of burst are the angle of approach to the target and the reflectivity of the target terrain. LARGE DEFLECTION AND ELEVATION CHANGES. When a large number of cartridges are needed for a mission, they may be removed from the containers and prepared. A .mil website belongs to an official government organization in the United States. (1) The M772A1 fuze is a MTSQ. The safety/packing clip should be removed when the cartridge is unpacked.
PDF Principles of Fire Support B2c2437 Student Handout e. Care, Handling, and Preservation. After the rounds have been removed, they should always be handled with two hands to prevent accidental dropping. News. XM1210. There is a selector on the lower shaft for non-delay or delay impact action. The pile is covered with a double thickness of tarpaulin. (3) The securing strap is correctly located, securing the barrel clamps and buffers to the plain leg. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. At the muzzle end is a cone-shaped blast attenuator device (BAD) that is fitted to reduce noise.
Mortar, 81mm M1 - Military Factory The removable increments are fitted onto or around the shaft, depending on their type. .50: BROWNING, M2 (HEAVY BARREL, FLEXIBLE) ON MOUNT, MACHINE GUN, TRIPOD MTD, CAL. He must ensure that the ball-shaped end of the locking rod is secured in its recess by the locking latch. (b) In selecting the exact mortar position, the leader looks quickly for mask clearance and overhead interference. 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. M120/M121 120 mm Mortar. The squad leader points to the exact spot where the mortar is to be mounted. The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. 4-4. The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is The mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. 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.
81mm ML 3-inch | Weaponsystems.net The cartridge weighs about 9.12 pounds. It has a time setting of up to 25 seconds.
Mortar Weapon Systems - USAASC 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. Identification. The fuze setter, M25, sets M84-series time fuzes. HE ammunition is used against personnel and materiel. . It weighs about 9.05 pounds. 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) . c. The first ammunition bearer ensures that each cartridge is clean, the safety pin is present, and the ignition cartridge is in good condition.
PDF 81-mm MORTAR, M252 - GlobalSecurity.org The table on the right describes the three most common setups. 4-12. He has the duty of preparing the ammunition and passing it to the assistant gunner. 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. Section I. 120mm IHE grenade DM91. (7) When opening an ammunition box, the ammunition bearer ensures the box is horizontal to the ground, not nose- or fin-end up. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. (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. b. With the clamps facing away from him, the assistant gunner traverses the buffer carrier to the traversing handwheel and folds the handle. Each round is stenciled with the ammunition lot number, type of round, type of filler, and caliber. He must not stand directly behind the mortar. The bipod provides front support for the barrel and carries the gears necessary to lay the mortar. Figure 4-4. Safety before firing is provided by a safety wire, which must be removed just before firing.
81mm L16 | Weaponsystems.net 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 .
PDF IMLC EQUIPMENT SUPPLY LIST - United States Army An ammunition lot number is assigned to each ammunition lot, which is marked on each cartridge and packing container. 81mm 120mm 60mm . (8) To help minimize the occurrence of short rounds and or duds, unpackaged ammunition that has been dropped should not be fired. It can be set from 3 to 55 seconds at half-second intervals. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. The terms cannon and barrel are used interchangeably in this chapter.
Barrel (with blast attenuator device)
High angles of approach (near vertical) give the lowest burst heights. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. I say 120s are bad because they suffer from terrible dispersion even when not shooting at 6km. In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. Remaining increments are repositioned towards the rear of the tail fin assembly when firing the cartridge with horseshoe-shaped increments at less than full charge.
Joint Program Executive Office for Armaments & Ammunition Fort Belvoir, VA 22060
b. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. This ensures a maximum traversing and elevating capability after making the movement. Correct way to open an ammunition box. At the command, MARCH ORDER, the squad places the mortar, equipment, and ammunition in the squad vehicle and trailer. The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. Range Minimum to maximum 83 to 5,608 meters Rate of Fire . The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. Examples are: This round may be stored in a horizontal position. He then checks the sight picture to ensure he is within 20 mils of a proper sight picture. d. The gunner rough levels the cross-level bubble by making the bubble bounce from one side to the other. If not, the cartridge is placed on its side, and the closing plug is removed using an M18 fuze wrench. .30, BROWNING, M1919A4 AND M2 (HEAVY BARREL), .30, M2 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE: CAL.
PDF Principles of Fire Support B2c0289xq Student Handout on Amazon.com. He stands to the rear of the baseplate and supports the barrel until the bipod is fitted. If the round does not fire, the gunner tests the barrel for heat. 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. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate.
M821/M889 81mm HE Mortar Cartridges - GlobalSecurity.org Red phosphorus rounds can be fired from the M29/M29A1 at a reduced charge (maximum charge = charge 2). They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. Burst Height. He rotates the socket so that the open end is pointing in the direction of fire. The first ammunition bearer puts both hands on the cooling fins under the barrel and slowly lifts the barrel until it is horizontal. Training practice is used only for training. 81MM M252A1. It uses the M772 mechanical time fuze and weighs about 10.6 pounds. (3) The M256-series fuze has an SQ/IMP function only. The mount consists of elevating and traversing mechanisms and a bipod (Figure 4-4). c. The first ammunition bearer checks the barrel and ensures that--. 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. It uses the M219 propelling charge and weighs about 9.1 pounds. (3) The circlip is correctly located, securing the rotating socket to the baseplate.
[Firing and Deflection Conversion Tables] - The Portal to Texas History d. The first ammunition bearer stands to the right rear of the mortar. It has no safety pins or wires to reduce preparation time. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. REFER DEFLECTION TWO EIGHT SEVEN FIVE (2875), REALIGN AIMING POSTS. a. Before-firing checks include the following: (1) Ammunition should be free of moisture, rust, and dirt. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. b. When set at SQ, the fuze functions on point impact or graze contact. 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. An air cavity can form on one side of a cartridge to unbalance it, causing instability in flight. When targets are beyond such irregularities, a clearance of at least 30 meters should be allowed to ensure maximum effect over the target area. 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. Table 4-1. These propellants are flash-suppressed and clean burning resulting in minimum residue, flash and blast overpressure. 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 floating firing pin located within the primer has approximately 1/16 of an inch to move around.
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