Test. MORTAR, CAPABILITIES /LIMITATIONSFire Commands- Technical instructions Weight (Complete System) 89 pounds (40.41 kilograms) Bore diameter. The fuze is screwed into the cartridge body, and it is seated and secured using an M18 wrench. This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. f. If the above procedure fails to remove the misfire, the barrel must be kept horizontal. d. When the barrel reaches the horizontal position, and not before, the assistant gunner moves the thumb of each hand over the muzzle. At this command, the squad proceeds as follows: a. The M751 fuze is the only dummy fuze used with the 81-mm mortar. * Range: at least 4,512 meters * Rate of Fire: at least 12 rounds per minute (sustained) * Crew: can be operated by at least 4 men. The light weight and quick set up of the M2 made it an excellent indirect fire support for the fast moving Rangers. instrument. Minimum range in the high-angle indirect fire mode is 80 meters, although some mortars can be aimed horizontally in direct fire, often for final protective fire of the mortar position. First Ammunition *Question: The dovetail slot is used to attach what c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. c. The M374A3 HE cartridge is constructed from pearlitic malleable cast iron and contains about 2.10 pounds of composition B explosive. Ammunition is typed according to use (Table 4-2). The M734 multioption fuze is the only one used with the 81-mm mortar. for the British 81mm L16 mortar introduced in the mid sixties, the max range of just the primary charge is 520 meters, whereas with 6 augmentation charges a max range of 4680 m can be achieved. The air burst over average types of soil ranges from 1 to 6 meters, depending on the angle of approach. 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. 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). Burst Height. The safety pull wire is removed just before inserting the cartridge into the mortar. rates of fire for m252a1. He moves the mortar until the vertical line of the sight is aligned approximately on the aiming post. Safety before firing is provided by a safety wire, which must be removed just before firing. He makes large deflection shifts by shifting the bipod assembly and keeps the bubbles level during firing. 5608m. When set at SQ, the fuze functions on point impact or graze contact. At the muzzle end is a cone-shaped blast attenuator device (BAD) that is fitted to reduce noise. 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. Barrel (with blast attenuator device) It has four function settings: PRX (proximity) causes the cartridge to explode between 3 and 13 feet above the ground; NSB (near-surface burst) causes the cartridge to explode up to 3 feet above the ground; IM (impact) causes the cartridge to explode on contact; and DLY (delay) incorporates a 0.05-second delay in the fuze train before exploding the cartridge. "81mm rounds have a maximum effective range of 5,608 meters," said Leininger. The sustained rate of fire is 15 rounds per minute indefinitely. The second ammunition bearer retrieves the aiming posts. This publication, DEPARTMENT OF THE ARMY 9 e89600 60mm mortar, all types 175 10 e76000 81mm mortar, all types 209 11 e25500, REVIEWER AFPOS: INFANTRY RANK: CORPORAL 2017-08-01 a. Sources: Overhead interference can be branches of trees or roofs of buildings. Created by. The BAD is removed only by qualified maintenance personnel. DLY (delay) incorporates a 0.05-second delay in the fuze train before exploding the cartridge. The cartridges are painted olive drab with yellow markings. a. A securing strap is attached to the plain leg for securing the bipod in the folded position. a. The version produced and used by Australia is named the F2 81mm Mortar, whilst the version used by the U.S. armed forces is known as the M252. In the U.S. Army and U.S. Marine Corps, it is normally deployed in the . a. He maintains the ammunition for firing and provides local security for the mortar position. . The round is used to illuminate targets during night operations. What is the meaning of the common term "Action" ? If, upon removal of the safety wire, a buzzing sound in the fuze is heard, the round should not be used. Rate of Fire (Maximum) It uses the M185 propelling charge that consists of eight increments fitted into the spaces between the fins and held by a propellant holder. The members of a 81mm mortar gun crew include: Squad Leader- In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities and checks the data!!! 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 Marines' Trusty Mortar Is Getting a Major Upgrade - Popular Mechanics He exposes 4 inches (100 millimeters) of elevation shaft and folds the handle. How much does an 81mm mortar round weight? - KnowledgeBurrow.com Illuminating is used for battlefield illumination and signaling. Study sets, textbooks, questions. It is light enough to be portable when broken down into its . The fuze is not intended to function at charge 0. The M751 is fitted with a smoke charge that operates on impact. The fuze should already be fitted to the cartridge. The M1 collapsable design made it portable but at 45pounds per piece made it difficult to move. It provides illumination for about 60 seconds with 600,000 candlepower illumination. This round may be stored in a horizontal position. 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. --M4 dedicated troop room. 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. They function normally in light rain; however, heavy rain, sleet, or snow can cause an increase in the number of early bursts. U.S. Mortars of World War II - World War Media b. A spring-loaded locating catch is behind the elevating gear housing, which locates the plain leg in its supporting position for level ground. Between this and its minimum . The propelling charges are assembled around the fin assembly shaft. (4) Extra increments are removed if the cartridge is to be fired with less than full charge. a. He uses the chain of command to assist him in effecting his command and supervising duties. The propellant train (except the training cartridge) consists of an ignition cartridge and propellant charges. The E44-E mortar incorporates features of modern requirements and is capable of firing all types of 81 mm mortar rounds. The fuze consists of a brass head, body assembly, and expelling charge. [M4 exclusive parts]. An 82mm variant was developed by the Soviet Union, which has the advantage of being able to use captured NATO ammunition but the 81mm could not use 82mm. 60mm Mortar c. 81mm Mortar b. M66 LMAW d. M60, WWII MicroArmour : The Game Weapons Data Tables Site/WWII MATG81mm Mortar [2] 36 0 6 26 26 6 2F - 6 R I S P 41 US41 81mm Mortar [3] 51 0 6 26 26 6 2F - 8 R I S P 41 US41 M4 MMC, INITIATION TRIALS OF IMX-104 IN 81MM MORTARS .INITIATION TRIALS OF IMX-104 IN 81MM MORTARS PBXN-5, The 81mm Non Lethal Mortar Carrier Projectile (MoCaP) 2017. When disposing of unused augmenting cartridges what is the minimum length of safety fuze that should be used ? All rounds are colored according to their type. The range of any given mortar systems depends on the cartridge which possesses the maximum range. A similar round, the M766 SRTR, was developed for the 60mm mortar and released in 1998. The ignition cartridge strikes the firing pin and detonates, which causes a flash that passes through the radial holes in the shaft. Several types of RP/WP ammunition are described herein. The kill radius of the 10-pound HE round is approximately 35 meters. It contains white phosphorus that produces white smoke on contact with air. a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. The sight bracket is attached to the buffer carrier, which is fitted to the traversing screw assembly. 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. Rates Of Fire The rapid rate for the 81mm mortar is 30 rounds for the first 2 minutes. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. Gary's U.S. Infantry Weapons Reference Guide, 90 to 150 by 30 to 40 meters for 2 to 3 minutes. b. b. The United Kingdom's L16 81 mm mortar is the standard mortar used by the British armed forces. d. The squad leader supervises the squad drill and is responsible for supervising the laying out of the equipment as shown in Figure 4-6. The M374 cartridge is fitted with the M90 propelling charge. The corrections for range and lateral spread are ? It is fitted with a standard pull wire and safety pin that are removed immediately before firing. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. b. Types of rounds, classification, and characteristics for the 81-mm mortar, M252. 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. The High Explosive 81mm mortar bomb L41 series is fitted with the Mk4 Charge System and employ a spheroidal cast iron bomb body, which combined with a high energy explosive filling, provides optimised fragmentation. Added more info for M819, M821, M853, M889 The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail.