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The M821 HE cartridge (M252 only) is a British-made cartridge fitted with the US M734 multioption fuze. He ensures that the firing pin recess is facing upwards. M3A1 Baseplate Safety before firing is provided by a safety wire, which must be removed just before firing. Powered by Hugo. A securing strap is attached to the plain leg for securing the bipod in the folded position. The M853 and M301A3 illuminating ammunition are described herein. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. Maximum Range (meters): 7,240 (with standard fuze) . The M1 became the standard American . They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. However, since explosives are affected by moisture and high temperature, they must be protected. (6) The primer cartridge is checked for damage or dampness. 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. This is the inert PD fuze type "IR-81" used by the Italians for their 81mm mortar rounds during WWII. b. (2) Color code. ), 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). 4-12. The cartridge is dropped down the barrel, fin-end first. Other armies count on 81mm mortar families. (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay. He places his thumbs alongside the forefingers, being careful to keep both hands away from the muzzle. News. 1:4 For the 81MM Mortar System: X NSN (LIN): 1015-01-441-3113 : STAFF SECTION, CLEANING, ARTILLERY 1:4: (3) The circlip is correctly located, securing the rotating socket to the baseplate. Several types of HE ammunition are used in the 81-mm mortar, M252. The M252 medium mortar offers a compromise between the light and heavy mortars. He exposes 1 inch (25 millimeters) of cross-level shaft and folds the handle. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. 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. These cartridges are used first in subsequent firing so that once-opened stocks can be kept to a minimum. Before the mortar is mounted, the squad must perform premount checks. TM - Technical Manuals (Range 9) TM - Technical Manuals (Range 10) TM - Technical Manuals (Range 11-4) TM - Technical Manuals (Range 11-5) . FIRING TABLE 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; AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B; 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 FIRING PROJECTILE, GUIDED, M712 (COPPERHEAD) WITH SHAPED TRAJECTORIES (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM, HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 AND 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, BASE-BURN, M864 AND M864A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), PRELIMINARY AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, XM982 (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, XM982 (S&I BY PROP SEE DETAILS, FOOTNOTES), PROVISIONAL AIMING DATA FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, M982 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 165-MM GUN, M135 ON COMBAT ENGINEER VEHICLE, FULL TRACKED, M728; FIRING CARTRIDGE, 165-MM, HEP, M123A1 AND 165-MM, TP-T, XM623 (S&I BY PROP SEE DETAILS, FOOTNOTES), CANNON, 175-MM GUN, M113 AND M113A1 ON GUN, FIELD ARTILLERY, SELF-PROPELLED: 175-MM, M107; FIRING PROJECTILE, HE, M437A2 AND M437A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICERS (XOS) MINIMUM QUADRANT ELEVATION WITH CANNON, 105MM HOWITZER, M20A1 ON HOWITZER, LIGHT, TOWED, 105MM, M119A1; HOWITZER, LIGHT, TOWED, 105MM, M119A2; HOWITZER, LIGHT, TOWED, 105MM, M119A3 FIRING WITH PROPELLING CHARGES, M67 AND M200 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICER S (XO S) MINIMUM QUADRANT ELEVATION WITH CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5/A6 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1/A2 FIRING WITH PROPELLING CHARGES, M231, M232, AND M232A1 (S&I BY PROP SEE DETAILS, FOOTNOTES), RAPID FIRE TABLES FOR CALCULATION OF THE EXECUTIVE OFFICERS (XOS) MINIMUM QUADRANT ELEVATION WITH CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5; HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6; AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A7, AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777A1 AND HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING WITH PROPELLING CHARGES, M231, M232, AND M232A1 (S&I BY PROPONENT, SEE DETAILS, FOOTNOTES), ADDENDUM TO FTR LANCE-B-1 FOR WARHEAD SECTION, GUIDED MISSILE, HE: M251 (U) (S&I BY PROP SEE DETAILS, FOOTNOTES), Search Army publications and forms by Number, Title, or Record Detail. The mortar is within two turns of center of traverse. The gunner moves the mortar as the assistant gunner steadies it. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. 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. a. 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 120mm 60mm . e. The M362A1 and M362 HE cartridges are of steel forge construction and contain about 2.10 pounds of composition B explosive. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. a. 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). 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. The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. 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 mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. e. The gunner centers the elevation bubble. The entire squad stays with the mortar. (e) If the mask is not regular throughout the sector of fire, the gunner determines the minimum mask clearance as described above. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. 4-4. MFCS Mounted. They are fuzed with the M524-series, M256-series, or M532. 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. .30, BROWNING, M1919A4 AND M2 (HEAVY BARREL), .30, M2 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE: CAL. The gunner unlocks the barrel clamp and rotates the barrel, unlocking the breech plug from the rotating socket of the baseplate. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. At the same time, the first ammunition bearer moves out on the double to realign the aiming posts. Overhead interference can be branches of trees or roofs of buildings. The cannon has a crew-removable breech plug and firing pin. VERY NICE condition! The cartridges are painted olive drab with yellow markings. Joint Tables of Allowance; PB - Professional Bulletins; STP - Soldier Training Publications; TC - Training Circulars; . The mortar squad consists of five men (Figure 4-1). It uses the M772 mechanical time fuze and weighs about 10.6 pounds. It is constructed from ductile cast iron and contains about 1.5 pounds of cyclonite (RDX)/trinitrotoluene (TNT) composition explosive. The M821A2/821A1/889A1 consists of the following major components: M935 Point Detonating Fuze or M734/734A1 Multi-Option Fuze. 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. (d) Firing is slowed if mask clearance must be checked before each firing but this can be eliminated if minimum mask clearance is determined. The muzzle end has a short tapered lead-in which acts as a . CANNON . Several types of RP/WP ammunition are described herein. All mortar cartridges are painted to prevent rust and to identify their type. If it is necessary to leave the ammunition uncovered, it should be raised on dunnage at least 6 inches above the ground. a. Point-Detonating. (1) Mask clearance and overhead clearance are sufficient. After the barrel cools, the gunner removes the sight and firing pin. Theme by TechDoc. Training practice is used only for training. 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. [1] [2] Many countries use or used an 81 mm mortar in their armed forces. b. 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. The mortar is then re-laid on the aiming posts using the traversing crank. f. Installation. These fuzes use a clockwork mechanism to delay functioning for a specific time. When fired, the cartridge carries the ignition cartridge with it, leaving the mortar ready for the next cartridge. In addition to loading, he swabs the bore after 10 rounds have been fired or after each fire mission. The 81mm weapons platoon consisted of the headquarters platoon and four mortar squads. b. c. Mechanical Time. (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. a. c. Upon receiving the command REFER, REALIGN AIMING POST, two actions take place at the same time in the mortar squad. 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 first ammunition bearer puts both hands on the cooling fins under the barrel and slowly lifts the barrel until it is horizontal. They are assembled with either an M524-series, M526-series, or M567 fuze. One-quarter turn on the adjusting nut equals one turn of the traversing handwheel. f. The open end of the socket must continue to point in the direction of fire. Figure 4-7. Standard A ammunition for the M29A1 mortar is Standard B for the M252 mortar (, Light green Yellow band with red markings. The 81mm mortar is a portable, mobile, medium mortar at the infantry's disposal. Figure 4-8. 120mm IHE grenade DM91. 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. Weights (pounds) System (including basic issue items) Barrel (with blast attenuator device) Mount M3A1 Baseplate 120MM Mortar System. The removable increments are fitted onto or around the shaft, depending on their type. a. (3) The M256-series fuze has an SQ/IMP function only. Red phosphorus/white phosphorus is used for screening, producing casualties, creating incendiary effects, and signaling. They should not be approached for 5 minutes or disturbed for at least 30 minutes after firing. The fuze has a safety wire that must be removed before firing. The table on the right describes the three most common setups. HE Guided Mortar is in development. There is a selector on the lower shaft for non-delay or delay impact action. REFERRING OF THE SIGHT AND REALIGNMENT OF AIMING POSTS USING M64 SIGHT. (4) The leg-locking handwheel is hand tight. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. The Mark 4 and 5 barrels were introduced during World War 2 and have a much increased range. The M301A3 cartridge has a cylindrical body that contains an illuminating candle and parachute assembly. 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. It has a time setting of up to 50 seconds. He opens the cross-level handwheel, traversing handwheel, and barrel clamp. If he is not within 20 mils, the gunner and assistant gunner must make another large shift before moving on. The types of fuzes described in this paragraph are point detonating, proximity, mechanical time, multioption, and dummy. (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. The gunner is given an administrative command to lay the mortar on a deflection of 2860 or 2740 mils. M64A1 Sightunit. He releases the securing strap, loosens the leg-locking handwheel, and lowers the plain leg until the locating catch engages in the recess. 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.] Ammunition is made and packed to withstand all conditions ordinarily encountered in the field. Then he relocks the barrel clamp. d. Multioption. A lock ( b. The RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. 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 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 . At the command, MARCH ORDER, the squad places the mortar, equipment, and ammunition in the squad vehicle and trailer. Referring and realigning aiming posts ensure that all mortars are set on the same data. The contents of ammunition containers are shown by markings. Their firing positions and principal duties are as follows: a. Training practice--M879, M880, M68, and sabot. a. The equipment is placed out the same as for the gunner's examination (Chapter 9). M252A1 81mm Mortar: Maximum Range (meters): 5,935; Ammunition: War reserve HE (M821A3), red phosphorus smoke (M819), visible light illumination (M853A1), infrared illumination (M816), war reserve and training HE (M889A4), and FRP . c. The gunner grasps both ends of the traverse screw assembly and supports the mortar during the subsequent drill. All PD fuzes are superquick--detonate on impact. If the barrel is cool enough to handle, the crew removes the round as described below. This ensures a maximum traversing and elevating capability after making the movement. The squad leader notifies the FDC of the minimum mask clearance elevation. (2) The breech plug is screwed tightly to the barrel. General Dynamics Ordnance and Tactical Systems is the leading manufacturer of propellants for 60mm, 81mm and 120mm Mortar Systems. Its range and explosive power is greater than the M224, yet it is still light enough to be man . That is generally how I use mortars. e. The second ammunition bearer stands to the right rear of the mortar behind the ammunition bearer. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. Table 4-2. Proximity-fuzed short cartridges, which are duds, contain a complete explosive train and impact element.