Accession Number:

AD0705381

Title:

THE THEORY OF THE MOTION OF A BULLET ABOUT ITS CENTER OF GRAVITY IN DENSE MEDIA WITH APPLICATIONS TO BULLET DESIGN

Descriptive Note:

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1930-01-14

Pagination or Media Count:

21.0

Abstract:

An investigation is made of the motion of the bullet about its center of gravity in a dense medium. It is found that approximately the yaw of the bullet in such a medium is an exponential function of the time, that is to say, that it increases according to ekt. It is shown that the value of the quantity k is much more significant for the motion that even the size of the yaw upon impact. Methods of determining k are given. It is shown that the size of the yaw in the medium is approximately independent of the striking velocity and therefore for a given bullet, the amount of energy absorbed will be proportional to the square of the striking velocity. It is shown that the twist of rifling has no appreciable effect upon the size of the yaw in a dense medium except in so far as it affects the size of the yaw on impact. It is pointed out that a large value of k may be obtained by the use of bullets having light noses and it is indicated that for a given muzzle energy there will be greater energy absorbed from light bullets than from heavy bullets. The theory is applied to the effect of the caliber on the amount of energy absorbed in the medium.

Subject Categories:

  • Ammunition and Explosives
  • Ballistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE