Pire Panels

Figura 95. Crack and thump Ur§$i dtfeetio* rangé.

c. Weapons ¡Requirements. À minimum of 12 riflf positions {cradles) should be prepared. When the weapon is secured in the cradle, the trajectory must not be less than 20. feet above the highest position at which a student will be located. Every weapon used for this instruction should be in spected by local ordnance to insure it does not exceed the authorized bore tolerance.

d. Ammunition. Only ammunition that has been certified by the local ordnance technicians as being approved for overhead fire may be used.

79. Training Policies

«. General The first series of trials conducted should be critiqued by the instructor to insure that each soldier thoroughly understands the principles of applying the crack and thump technique of locating a concealed target. Then as many trials as time permits may be conducted to test the soldier's proficiency.

b. Technique of Crack and Thump. The soldier must understand that when an enemy soldier engages him with semiautomatic or automatic fire» the first sound that he will hear is the crack(s) of the projectile<s> as it passes nearby. The next soundtsl that he will hear is the thump(a) which is the compressed gases escaping from the mustle of the weapon into the atmosphere. Therefore, by mentally alining the crack(s) with the thumpUK the soldier can determine the direction of his target (location of enemy firerK

e. Crack end Thump Range Determination. In addition to determining the direction to the target, the soldier must also determine the range to the target. This is accomplished by using the rapid count method. The rapid count method is conducted by the soldier starting his count when he hears the crack and continues until he hears the thump. This count is conducted at a fast rate of five counta per second. If the soldier is engaged by automatic fire, he starts his count on the last crack and ends it on the laat thump. The count obtained is multiplied by 100 and this gives him the range to the target in hundreds of meters. This method of range determination may be used in conjunction with the 100-meter-unit-ofmeasure method or the ap pear an ce-of-objects method of r*nge determination to obtain the ground distance to the target.

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