Mortars Exam Prep Flashcards
The M2 compass primary use?
To obtain azimuths and angles of sight.
M2 compass azimuth scale is graduated from?
0 to 6400 in 20 mil increments and numbered at every 200 mil intervals.
M2 & M2A2 characteristics
Weight without equipment:9 lbs
Weight without equipment less batteries:21lbs
Azimuth rotation: 6400mils
Elevation: (800 mils M2) (1100 mils M2A2)
Depression: 400 mils
Magnification: X4
Field of view. 10 degrees
M2 and M2A2 how many bubbles?
Three bubbles. Two tubular, one fish-eyed
M2 and M2A2 main scale.
Colored black and numbered at 200 mil intervals.
M2 and M2A2 red scale.
Should only be used when verifying the lay of the aiming circle with another aiming Circle.
M2 and M2A2 azimuth micrometer scale is graduated at?
1 mil intervals and numbered from 0 to 100 at 10 mil intervals.
M2 and M2A2 the elevation micrometer scale is graduated at?
1 mil intervals from 0 to 99 mils– large zero is designated as 0 and 100.
Aiming Circle distance from objects.
High tension power lines and electronic equipment: 150m Railroad tracks, trucks and tanks: 75m Vehicles: 50m Barbed wire: 30m Mortars or Telegraph Wire: 25m Helmets and so forth: 10m
Declination constant
The clockwise angle between grid North and magnetic north.
Declination station
To determine the declination constants of instruments and to correct for local attractions, annual variations and instrument errors.
When to declinate the aiming Circle
When it’s move 25 miles or more from the area in which it was last declinated.
After an electrical storm or after receiving a severe shock such as a drop.
Every 30 days.
M67 unit sight
Field of view 10 degrees
Magnification X4
Replacing the m67 sight unit in the carrying case
Elevation of 800 Mils and deflection of 3200 Mil. s
The boresight detects?
Deflection and elevation errors in the site.
M45 boresight
Weight: 2.5
Field of view: 12 degrees
Magnification: X3
M115 boresight
Weight: 5 ounces
Field of view: 17 degrees
Magnification: 1.5
Who determines the Azimuth on which the section is to be laid and notifies the platoon sergeant?
The FDC
The principle of reciprocal laying is based on the Geometric Theorem that states if two parallel lines are cut by a transversal, the alternate interior angles are…
Equal
M224A1 60-mm rate of fire
Max 30rpm for 4 minutes
Sustained 20rpm
M224A1 60-mm range
70-3490m conventional
70-1340m handheld
M224A1 60-mm weight
- 1 Conventional
16. 6 handheld
M224A1 60-mm cannon
M225A1
M224A1 60-mm bipod
M170A1- provides 250mils of Traverse
M224A1 60-mm baseplate
M7A1 and M8 handheld
M224A1 60-mm type of fire
Drop fire and Trigger fire
M224A1 60-mm upper and lower saddles
Upper- 0800-1100
Lower- 1101- 1511
M224A1 60-mm baseplates
M7A1: full rotation of 6400 mils and can be used to fire charge 0 through 4.
M8: 800 mils left and right handheld mode 1600 total
M8A1: full rotation of 6400 mils charge 0 to 1 handheld but is capable of 0 to 4.
Three major components to mortar cartridges
Fuse, body, and tail fin with propulsion System Assembly.
M224A1 60-mm HE mortar
M720 range 3490m
M720A1 3490
M888 3520
M768 3490
Proximity burst fuze
1 to 4 meters above ground
NSB
0 to 1 meter above ground
M734 fuze settings
Impact NSB Proximity Delayed 1/2 second No safety pins or wires
Point detonating Fuze m935
Super quick or delay it has a standard pull wire safety that is removed immediately before firing.
M252A1 81mm mortar cannon nomenclature
M253 30.5lbs
M252A1 81mm mortar mount
M177A1 21.3 lb 100 mils left and right traverse 7 per turn Traverse 0800-1511 elevation 10 mils elevation per turn of handwheel
M252A1 81mm mortar baseplate
M3A2: 23lbs
M252A1 81mm mortar range
Max 5608m
Minimum 83m
M252A1 81mm mortar rate of fire
Max 30rds for 2 minutes
Sustained 15rds
M252A1 81mm mortar boresight
0 deflection and 0800 elevation no less than 200m away target. Sight unit case 25m away 8.28 circle right outer edge
M252A1 81mm mortar ammunition color
OD Green: he
White: illumination
Light green: phosphorus
M252A1 81mm mortar HE rounds
M821/ M821A1 HE range 5608
Two methods used to fire the mortar without an FDC.
Direct lay and direct alignment
Firing on a wide target
Traversing fire
Firing on deep targets
Searching fire
Direct lay method
Gunnar sees the target through the mortar site
Direct alignment method
Fo observes the Target near the mortar or the gun target line he observes the fall of rounds mkes Corrections relative to the gun target line and gives gun commands directly to the mortar Squad.
Orders are implace by
Platoon, section and by Squad.
Methods of reconnaissance
Map reconnaissance, air reconnaissance and ground reconnaissance
Mission accomplishment
The most important factor
Position selection
Mission accomplishment tactical situation range Target area coverage survivability overhead and mass clearance surface conditions Communications routes.
Range considerations
One half to two-thirds of their range
Types of occupation
Deliberate, hasty and emergency.
Deliberate and haste are plan the difference is time. Emergency a call for fire is received while the platoons make and tactical movement
Displacement techniques
Displacement by platoon by section by squads or section
Types of bounding
Successive bounding and Alternate bounding
Successive they match up with each other then bound alternate one leaps in front of the other.
Mortar formations
Parallel lazy w diamond triangle 6 mortar star formation
120mm mortar cannon
M298 110lbs
120mm mortar bipod
M190 ground-mounted 70lba
M191 ground / carried mounted 68lbs
120mm mortar baseplate
M9 136lbs
120mm mortar range
Max 7200 m
Minimum 200
120mm mortar rate of fire
Maximum 16 first minute
Sustained 4
120mm mortar elevation
Ground-mounted 0710- 1510
Carrier mounted 0750-1510
5 mils each turn of elevation crank
120mm mortar Traverse
Right or left from Center 136
With extension 316
One turn of traversing wheel 5 mils
