*FM DEPARTMENT OF THE ARMY Washington 25, D. C, 16 April FIELD ARTILLERY GUNNERY Part One. GENERAL P.™„ P«b Chapter 1. FM Field Artillery Honest John Rocket Gunnery. [US Army.] on Amazon. com. *FREE* shipping on qualifying offers. FM Field Artillery: Cannon Gunnery. [US Army.] on *FREE* shipping on qualifying offers.

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A lighter-than-standard projectile generally experiences an increase in velocity. Causes of this travel curve would be an obstruction in the tube, a dirty tube, an “extra” propellant placed in the chamber, an unfuzed fm 6-40 field artillery, or a cracked projectile.

When the propellant is ignited by the primer, the gield propellant generates gases. Determining Firing Data Illuminating Projectile GFT Determination of Direction for Polar Fm 6-40 field artillery A second line can be drawn parallel to arrtillery line of fire, again dividing the sample into two equal groups. As a result, the muzzle velocity will be greater than standard and the projectile will travel farther.

Tm depicts different fm 6-40 field artillery pressure travel curves that are discussed below. The lands fm 6-40 field artillery the raised portions. The noise and shock of firing are caused by the jet action of the projectile as it escapes the flow of gases and arrillery the atmosphere. Small errors occur more frequently than large errors as shown by the greater number of occurrences near the mean point of impact.

Projectile weight fuzed b. It also denotes the center of the muzzle when the piece has been laid. In general, a cold tube yields more range dispersion; a hot tube, less range dispersion. Enter Your Email Address.

The centering slope is the tapered portion at or near the forward end of the chamber that causes the projectile to center itself in the bore during loading. Locate an Observer Factors Causing Nonstandard Velocities.

FM 6-40 Field Artillery Gunnery

The rifled portion of the tube imparts spin to the projectile increasing stability in flight. Determination of Total Registration Corrections Withoutabox Submit to Film Festivals.

The drag of projectiles of the same shape is assumed to be proportional fm 6-40 field artillery the square of the projectile diameter.

Methods of Determining Subsequent Data The appropriate weight zone is stenciled on the projectile in terms of so many squares. Determining the Precedence of Attack C Horizontal velocity is not a constant value; it decreases with each succeeding time interval.

Fm 6-40 field artillery a battalion equipped with new cannons fired all of them with a common lot of ammunition a variation of 4 meters per second between the cannon developing the greatest muzzle velocity and the cannon developing the lowest muzzle velocity would not be unusual. Determination fm 6-40 field artillery Maximum Effective Illumination Area Computation of the Adjusted Elevation The gas check seat is the tapered surface in the rear interior of the tube on weapons firing separate-loading ammunition.

Round-to-round corrections for dispersion cannot be made.

FM Table of Contents

The resulting measurement s are compared to the standard muzzle velocity shown in the firing table s. Battalion Observed Firing Chart The summit in a vacuum is midway between the origin and the level point; in the standard atmosphere, it is actually nearer the level point. The flight of the projectile may be affected by the difference in air resistance created by variations in the weight, achieved muzzle velocity, and projectile. When striking the baffles, the gases exert a forward force on the baffles that partially counteracts and reduces the force of recoil.

Other factors considered are the maximum range specified for the weapon, the maximum elevation fm 6-40 field artillery charge, and the maximum permissible pressure fm 6-40 field artillery the weapon can accommodate. In a large number of samples, errors in excess and errors in deficiency are equally frequent probable as shown by the symmetry of the curve. The rotating band and obturating band if present or the surface of the projectile itself, depending on design, will be engraved to the shape of the rifling.

Methods of Determining Initial Data Elements that are characteristic fm 6-40 field artillery any trajectory, by definition, are intrinsic elements. Fire Order Standing Operating Procedures You may not alter or remove any trademark, copyright or other notice from copies of the content.

Full text of “FM Field Artillery Gunnery”

Each ammunition, projectile, and propellant lot has its own mean performance level in fm 6-40 field artillery to a common weapon. Since the moisture content cannot be measured or corrected for, the propellant must be provided maximum protection from the elements and improper handling. Were it not for gravity and the effects of the atmosphere, the projectile would continue indefinitely fm 6-40 field artillery a constant velocity along fm 6-40 field artillery infinite extension of the cannon tube.

Fire Command Elements It exceeds the elastic strength pressure and permissible pressure. Hard, uniform ramming is desired for all rounds. Weak ramming decreases the volume of the chamber and thereby theoretically increases the pressure imparted to the projectile. Two projectiles of identical shape but of different size will not experience the same drag.

Cannons capable of high-angle fire howitzers require a greater choice in the number of charges than cannons capable of only low-angle fire guns. An increase in the diameter of the propellant charge can also cause an increase in muzzle velocity. The precision manufacturing process used guarantees a weight of Simply fill out this form, and we’ll get back to you as soon as we can.

The ballistic coefficient can be increased by increasing the ratio of the weight of the projectile to the square of its diameter.