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OPTIMIZED SUBSONIC PROJECTILES AND RELATED METHODS

  • US 20170131071A1
  • Filed: 11/28/2015
  • Published: 05/11/2017
  • Est. Priority Date: 04/21/2015
  • Status: Active Grant
First Claim
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1. A subsonic ammunition cartridge comprising:

  • a casing having a base end and an open end wherein said casing has an internal volume;

    a primer inserted in said base end of said casing;

    a projectile comprised of a nose cone, a body, and a boattail, wherein said body is disposed between said nose cone and said boattail, wherein a portion of the body section in proximity to said boatail of said projectile is inserted in the open end of said casing and press fitted to the portion of the body section; and

    a propellant wherein said propellant is placed within said casing surrounding said boatail;

    wherein said nose or body are formed with at least one turbulence generator comprising a ring or groove structure formed into said nose, body, or boattail that is perpendicular to a first axis formed by a line drawn from a center of said nose section to a center of said boattail section;

    wherein said boatail is formed with a plurality of rebated or stepped structures that are formed spaced apart into said boattail;

    wherein said nose cone is formed into an elliptical shape with a flattened meplat on said center of said nose cone section;

    wherein said projectile is formed with a center of pressure further from said center of said nose section along said first axis than a center of gravity;

    wherein said projectile is formed with a body to boattail transition having an angle of 8 degrees as defined by a first plane collinear with an external surface of said body and a second plane collinear with an external surface of said boattail;

    wherein said boattail extends from a point of said body to boattail transition to said base end of said casing but not in contact with said primer, wherein said point of said body to boattail transition is further from said center of said nose cone section along said first axis than said open end of said casing when said projectile is inserted inside said casing and said casing is press fitted to said projectile;

    wherein said propellant charge is selected so as to produce a force to maximize subsonic speed of said projectile as it enters an external ballistics phase to no more than a critical Mach number of less than Mach 1 at a temperature at which said projectile is functioning.

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