Aerodynamically contoured spinnable projectile
First Claim
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1. A cartridge with a longitudinal axis, a leading end region, a trailing end region, and a chamber therebetween, the cartridge having:
- a. a projectile mounted in the leading end region, the projectile having a base;
b. a propellant in the chamber;
c. the base of the projectile being provided with one or more aerodynamically contoured features that are separated by lands, such features being radially arranged about the longitudinal axis and receive forces generated by the propellant, at least some of the forces being resolved into rotational motion of the projectile so that the projectile may spin about the longitudinal axis;
wherein at least some of the one or more concave aerodynamically contoured features are concave and include a pocket with i. a ramp surface, a sidewall and an end wall that receive the forces generated by the propellant;
ii. the pocket being contoured so that at least some of the forces generated by the propellant produce rotational motion of the projectile.
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Abstract
A projectile for use in a cartridge having a longitudinal axis, a leading end region, a trailing end region, and a chamber therebetween. The projectile is mounted in the leading end region and has a base. The base of the projectile is provided with one or more aerodynamically contoured features that receive forces generated by a propellant. The aerodynamically contoured features are concave or convex or are a combination of concave and convex so that some of the forces produce forwardly directed and rotational motion of the projectile.
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Citations
17 Claims
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1. A cartridge with a longitudinal axis, a leading end region, a trailing end region, and a chamber therebetween, the cartridge having:
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a. a projectile mounted in the leading end region, the projectile having a base; b. a propellant in the chamber; c. the base of the projectile being provided with one or more aerodynamically contoured features that are separated by lands, such features being radially arranged about the longitudinal axis and receive forces generated by the propellant, at least some of the forces being resolved into rotational motion of the projectile so that the projectile may spin about the longitudinal axis; wherein at least some of the one or more concave aerodynamically contoured features are concave and include a pocket with i. a ramp surface, a sidewall and an end wall that receive the forces generated by the propellant;
ii. the pocket being contoured so that at least some of the forces generated by the propellant produce rotational motion of the projectile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification