The M30 A point of interest in the design of this mortar is the rifled barrel. A rifled barrel requires the round to be a very tight fit to the bore in order for the rifling to engage the round and impart rotation to it. But, in a muzzle-loading mortar, the round has to be loose enough in the bore to drop in from the front. In order to have it both ways, these rounds have an expandable ring at the base, which expands into the rifling under the pressure of the firing charge that propels the round.
|Published (Last):||1 July 2005|
|PDF File Size:||17.86 Mb|
|ePub File Size:||18.83 Mb|
|Price:||Free* [*Free Regsitration Required]|
FM Government agencies and their contractors only this publicati on addresses current technology in areas of significant or potentially significant military application. This determination was made on April 20, Other requests for this document will be referred to: Commandant, U.
This publication is available at Army Knowledge Online www. Genera l Doctrine. Effective Mortar Fire. Mortar Positions. Indirect Fire Team. Team Mission. United States Mortars. Safety Procedures. Duties of the Safety Officer and Supervisory Personnel. Surface Danger Zones. Ammunition Care and Handling. Ammunition Color Codes. Field Storage of Ammunition.
Compass, M2. Charact eristics. Government agencies and their contractors only this publication addresses current technology in areas of significant or potentially significant military application. Aiming Circles, M2 and M2A2. Accessory Equipment. Setup and Leveling of Aiming Circle.
Declination Constant. Orienting of the Instrument on Grid North to Measure. Grid Azimuth to Objects. Orienting of the Line on a Given Grid Azimuth.
Orienting of the Line on a Given. Magnetic Azimuth. Verification of the Lay of the Platoon. Orienting by Orienting Angle. Disassembly of Aiming Circle.
Care and Maintenance. Sightunit, M Sightunit, MSeries. Operation of Sightunits. Care and Maintenance of Sightunits. Radioactive Tritium Gas. Boresight, MSeries.
Principles of Operation. Boresight, M Sight Calibration. Boresight Method of Calibration. Other Equipment. Aiming Posts, M14 and M1A2. Aiming Post Lights, M58 and M Laying of the Section. Reciprocal Laying. Reciprocal Laying on a Grid Azimuth. Reciprocal Laying on a Magnetic Azimuth. Reciprocal Laying Using the Orienting Angle. Reciprocal Laying Using the Mortar Sights.
Reciprocal Laying Using the M2 Compass. Placing Out Aiming Posts. Loading and Firing. Firing of the Ground-Mounted Mortar. Target Engagement.
Execution of Fire Commands. Arm-and-Hand Signals. Subsequent Fire Commands. Repeating and Correcting of Fire Commands. Reporting of Errors in Firing. Night Firing. Squad and Section Organization and Duties. Tabulated Data. Cannon Assembly, M Bipod Assembly, M Baseplate, M7. Baseplate, M8. Premount Checks. Mounting of the Mortar. Safety Checks Before Firing.
Small Deflection and Elevation Changes. Large Deflection and Elevation Changes. Referring of the Sight and Realignment of Aiming Posts. Removal of a Misfire. Dismounting and Carrying of the Mortar. Classification and Types of Ammunition. Cartridge Preparation. Care and Handling. Mount, M Baseplate, M3A1. Referring of the Sight and Realignment of. Aiming Posts Using the M64 Sight. Dismounting of the Mortar. Squad Organization and Duties. Tabulated Data for the mm Mortar.
Bipod Assembly, M Ground-Mounted. Baseplate, M9. Placing a Ground-Mounted mm Mortar. Into Action. Performing Safety Checks on a Ground-Mounted. Performing Small Deflection and Elevation Changes. Performing Large Deflection and Elevation Changes. Malfunctions on a Ground-Mounted mm Mortar. During Peacetime. Referring of the Sight and Realignment. Performing Misfire Procedures on a Ground-Mounted.
Loading and Firing of the Ground-Mounted.
FM 23-90 Mortars
FM 23-90 (w/ CHANGE 1), ARMY FIELD MANUAL: MORTARS (09-DEC-2002)(TO 11W2-5-13-21)