WASHINGTON, October 10, FM , Field Artillery Field Manual, Firing, is published for the information and guidance of all concerned. [A. G. *FM DEPARTMENT OF THE ARMY Washington 25, D. C, 16 April FIELD ARTILLERY GUNNERY Part One. GENERAL P.™„ P«b Chapter 1. Training Circular (TC) , “Field Artillery Manual Cannon Gunnery,” sets forth the doctrine pertaining to the employment of artillery fires. It explains all.
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These properties include yaw the angle between the direction of motion and the axis of the projectile and the ratio of the velocity of the projectile to the speed of sound. Selection of an Orienting Point This term should not be confused with angle of fall.
Drag coefficients, which have artilery computed for many projectile types, simplify the work of ballisticians.
Transitional ballistics is a complex science that involves a number of variables that are not fully understood; therefore, it is not an exact science. Each of the following factors that cause nonstandard conditions is treated as a single entity assuming no influence from related factors. They have not, however, been incorporated into the download Adobe PDF version.
FM 6-40 Field Artillery Gunnery
Causes of Dispersion Firing tables are based on actual firings of a piece and its ammunition correlated to a set of standard conditions. The angle of fall is greater than the angle of elevation.
Causes that would result in this travel curve would be using wet powder or powder reversed. Time Plot, VI Unknown Desirable Pressure Travel Curve. In discussions of artillery fire, this phenomenon is called dispersion, and the array of bursts on the ground is called the dispersion pattern.
Safety Considerations for M Copperhead Conduct of the impact phase of a precision registration The temperature of the tube has a direct bearing on the developed muzzle velocity.
FM Table of Contents
Example of a Completed Precision Registration This line represents the mean deflection fk the sample and is called the mean deflection line. The values for range probable error at various ranges are given in Table G of the tabular firing tables TFT.
As a result, the pressure continues to rise until the peak pressure is reached. It decreases as the projectile travels toward the muzzle because the thickness of the tube decreases. Accurate Computational Procedures Determining the Precedence of Attack C Elements and Purpose Field Artillery Gunnery Team These erosive actions are more pronounced when higher charges are fired.
Nature of Propellant and Projectile Movement. This phenomenon occurs in weapons that develop a high muzzle velocity and when high charges are fired. Deflection Probable Error Fire Order Elements Immediately after that, its MV begins to artollery because of drag.
This is undesirable pressure travel curve.
FM (OBSOLETE) : Field artillery Cannon gunnery. :: Obsolete Military Manuals
It is currently impractical to measure propellant temperature artilllery apply corrections for each round fired by each cannon. It seems to “remember” the muzzle velocity of the last charge fired.
Determination of Chart Data and Registration Corrections Initiation of a Precision Registration A trajectory in the standard atmosphere, compared to a trajectory in a vacuum, will be shorter and lower at any specific point along the trajectory for the following reasons:. Determining the Method of Attack C The projectile will then almost immediately encounter the rifling, and the projectile will slow or stop again until the pressure has increased enough to overcome the resistance in the bore.
Because of drag, both the horizontal and vertical components of velocity are less at any given time along the trajectory than they would be if drag was zero as it would be in a vacuum. Terminal ballistics are discussed in Appendix B.
FM 6-40 1974 (OBSOLETE) : Field artillery Cannon gunnery.
Types of Scatterable Mines Interior, transitional, and exterior ballistics directly affect the accuracy of artillery fire and are discussed in this chapter. Technical Fire Direction Procedures Appropriate corrections can be extracted from that table; however, such corrections are valid only if they are determined relative to the true propellant temperature.
The term fork is used to express the change in elevation in mils needed to move the mean point of impact 4 probable errors in range.