(1) Mask clearance and overhead clearance are sufficient. After the 30-minute waiting period, the dud is still dangerous but can be approached and removed carefully or destroyed in place by qualified disposal personnel. 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. To dismount the mortar, the squad leader commands, OUT OF ACTION. An air cavity can form on one side of a cartridge to unbalance it, causing instability in flight. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. Once set to act as an impact fuze, the mechanism cannot be reset for PROX. 1:4 For the 81MM Mortar System: X NSN (LIN): 1015-01-441-3113 : STAFF SECTION, CLEANING, ARTILLERY 1:4: 0.30, BROWNING, M1917A1; GUN, MACHINE: CAL. The gunner places the outer edge of the baseplate against the baseplate stake so that the left edge of the cutaway portion of the baseplate is aligned with the right edge of the stake (Figure 4-7). (1) The M772A1 fuze is a MTSQ. 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. If the barrel is cool enough to handle, the crew removes the round as described below. The gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel. a. This round may be stored in a horizontal position. With the clamps facing away from him, the assistant gunner traverses the buffer carrier to the traversing handwheel and folds the handle. This round must be stored in a vertical position. Short cartridges can be expected when firing below charge 4. An official website of the United States government. c. The assistant gunner stands to the right of the mortar, facing the barrel and ready to load. If he is not within 20 mils, the gunner and assistant gunner must make another large shift before moving on. The 81mm Mortar - The David of Modern Warfare | SOFREP (2) The ribs and braces have no breaks, cracks, or dents. Firing tables are used to determine the correct charge for firing. The 60mm mortar section is located in the weapons platoon of the rifle company, is armed with three 60mm mortars, and is The terms cannon and barrel are used interchangeably in this chapter. The M252 medium mortar offers a compromise between the light and heavy mortars. On its right side, the clamp is recessed to receive the ball end of the locking rod. Long Range PGK. There must not be a visible gap between the fuze and cartridge body. The Mark 4 and 5 barrels were introduced during World War 2 and have a much increased range. Burst Height. f. The open end of the socket must continue to point in the direction of fire. The American M1 81mm Mortar, like the upcoming M2 60mm Mortar, was based on a French design by Edgar William Brandt (1880-1960). 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. He places firing data on the sight and lays the mortar for deflection and elevation. The cartridge is painted olive drab with yellow markings. He opens the cross-level handwheel, traversing handwheel, and barrel clamp. They use the M5 propelling charge that consists of eight cloth bags attached to the tail unit. It can be set from 3 to 55 seconds at half-second intervals. When the gunner is satisfied with his sight picture he announces, "Up.". The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. 81MM SYSTEM | Hirtenberger Defense Systems This document (FT 81 B3, abridged) consists of two pages, each with a separate table. PDF Principles of Fire Support B2c0289xq Student Handout Fired . Additional information is included on an ammunition data card inside each container. It engages the 1 3/4-inch flats on the setting ring or the fuze head. Designed by Thingsym. A securing strap is attached to the plain leg for securing the bipod in the folded position. However, at temperatures above 32 degrees Fahrenheit and at angles greater than 1068 mils, the flight time is sufficient to permit arming. An M18 fuze wrench is used to change settings. a. Point-Detonating. PDF Principles of Fire Support B2c0289xq Student Handout This is the inert PD fuze type "IR-81" used by the Italians for their 81mm mortar rounds during WWII. Complete cartridges are always handled with care. Target terrain, such as ice and dry sand, gives lowest burst heights, whereas water and wet ground give highest burst heights. To make the shift, the gunner places the fingers of his right hand in the muzzle and his left hand on the left leg. *FREE* shipping on qualifying offers. The cartridge is painted light green with black markings and one narrow brown band. g. The barrel clamps can be moved along the barrel to counter large changes in elevation. REFER DEFLECTION TWO EIGHT SEVEN FIVE (2875), REALIGN AIMING POSTS. The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. 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. b. The settings are obtained from the range tables and are applied using a wrench (number 9239539) or a 1 3/4-turn open-end wrench. (1) The rotating socket is free to move in a complete circle. c. After the gunner has announced, "Up," the squad leader should check the mortar to determine if the exercise was performed correctly. 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. ), 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. PDF 81-mm MORTAR, M252 - GlobalSecurity.org These fuzes use a clockwork mechanism to delay functioning for a specific time. While the assistant gunner supports the barrel, the gunner slackens the leg-locking handwheel, releases the locating catch, and positions the plain leg. 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 He stands to the rear of the baseplate and supports the barrel until the bipod is fitted. 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 section discusses the. It is fitted with a safety wire and pin that are removed immediately before firing. 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. They are fuzed with the M524-series, M256-series, or M532. The aluminum tail assembly has six integral fins equally spaced around the rear, which stabilize the round in flight. If it gets wet or dirty, it must be wiped off at once. Excess increments should not accumulate near the mortar positions but are removed to a designated place of burning and destroyed. The barrel clamp, which consists of an upper and lower clamp, is situated at the top. Its range and explosive power is greater than the M224, yet it is still light enough to be man . The fuze is nicely marked and is dated 1940. SQUAD AND SECTION ORGANIZATION AND DUTIES, Each member of the infantry mortar squad has principle duties and responsibilities. He is also the squad driver. The cartridges are returned to their original containers. This is accomplished by depressing the barrel until the top of the mask is clear. These propellants are flash-suppressed and clean burning resulting in minimum residue, flash and blast overpressure. b. 4-4. M29, 81mm Mortar - Military Factory Section I. The platoon leader commands the platoon and supervises the training of the elements. The assistant gunner exposes 8 inches (200 millimeters) of elevation shaft, leaving the elevation handwheel unfolded. Notches in the setter engage ribs in the setting ring of the fuze. All elements given in the fire command are repeated by the squad. The contents of ammunition containers are shown by markings. .50: BROWNING, M2 (HEAVY BARREL, FLEXIBLE) ON MOUNT, MACHINE GUN, TRIPOD MTD, CAL. 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. When firing under the control of an FDC, he reports to the FDC that mask clearance cannot be obtained at a certain elevation. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. MFCS Dismounted. The cartridge uses the M205 propelling charge and is assembled with the M567 or M524-series fuze. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. The elevation change announced must be less than 90 mils and more than 35 mils. 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 entire squad stays with the mortar. This may cause the firing pin to ignite the charges if the cartridge is dropped on the fin end (.
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