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Machine Gun Theory
Terms in this set (28)
Sustained Rate of Fire
Application: The gunner's normal rate of fire.
Maintenance: Pause for 4-5 seconds between bursts.
Barrel: Change Barrel after 10 min sustained rate.
Rapid Rate of Fire
Application: Works best when the gunner is trying to establish fire superiority.
Maintenance: 2-3 seconds between bursts.
Barrel: Change after 2 minutes.
Advantages: Exeptionally high volume of fire.
Disadvantages: Feasible only for short periods of time. Requires frequent barrel changes.
Cyclic Rate of Fire
Application: Only used in combat emergencies.
Method: Hold trigger uninterrupted for 1 min.
Advantage: Most possible rounds on target.
Disadvantage: Damaging to Barrel
Barrel: Change after firing 1 minute at cyclic rate.
Wide and deep target. Require extensive traversing and include targets whose exact location may not be known.
Enemy troops, bunkers, weapons emplacements and lightly armored vehicles that require the use of a single aiming point.
Line of Sight
An imaginary line from the firers eye, through the sights, to the point fo aim on the target.
Burst of Fire
A number of successive rounds fired with the same elevation and point of aim when the trigger is held to the rear.
The path of the round in flight. The path is generally flat at ranges up to 300m, then begins to curve.
The highest point of the trajectory between the muzzle of the weapon and the base of the target. It occurs about two thirds of the distance from the weapon to the target.
Cone of Fire
The pattern that a burst of rounds form on the way to the target.
The elliptical pattern formed on the ground or target by the striking of rounds.
The space between the MG and the target where the trajectory rises less than 1.8m from the ground. Includes the beaten zone.
Any fold or depression in the ground that prevents a target from being engaged from a fixed position.
Factors that Effect the Burst of Fire
The Gun and Ammunition
Clarity of target
Air Dist - Weather
Classes of Fire
Respect to ground
Respect to target
Respect to weapon
Occurs when the center of the cone of fire rises less than 1m above the ground. When firing on level or uniformly sloping terrain. Can only accomplish out to 600m.
Occurs when the danger space is only within the beaten zone. Also occurs when firing at long ranges, from high to low ground, into abruptly rising ground or across uneven terrain resulting in a loss of grazing fire at any point along the trajectory.
When the long axis of the beaten zone is at a right angle to the front of the target.
When a gunner fires at the side of a target.
When the long axis of the beaten zone is at an angle other than a right angle to the front of the target.
When the long axis of the beaten zone coincides or nearly coincides with the long axis of the target.
(Point Targets) Fire delivered against a point target when the depth and width of the beaten zone covers the target.
(Linear Targets) Fire distributed in width by successive changes in direction. The gunner selects aiming points throughout the width of the target.
(Deep targets) Fire distributed by successive changes in elevation
Traversing and Searching Fire
Comination of Traversing and Searchinh
Fire delivered against targets requiring rapid changes in direction and elevation that cannot be applied with the T&E.
Objectives of MG Marksmanship
Fire an accurate initial burst
Elements of Fire Command
Method of Fire
Command to Open Fire
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