Projectile

About: Projectile is a research topic. Over the lifetime, 13047 publications have been published within this topic receiving 115563 citations.

Non-hazardous ring airfoil projectile of non-lethal material

Abstract: A rotatable airfoil projectile comprising a hollow closed circular ring wing surrounding a central open area with a non-lethal riot control agent positioned within the hollow ring. The projectile consists of an aerodynamic lifting body of a thick ring wing geometry which uses spin imparted to it from a launching means for its gyroscopic stability. The combination of aerodynamic stability characteristics and high spin rate (i.e. above 2,000 rmp) results in a flat trajectory and extended range capability. The projectile ruptures on impact due to centrifugal and impact forces to distribute the non-lethal riot control payload about the target area. The sub-sonic launch velocity avoids bodily harm due to impact with a person even at point-blank range.

Criticality for stabilized oblique detonation waves around spherical bodies in acetylene/oxygen/krypton mixtures

Abstract: We have experimentally studied self-sustained oblique detonation waves around projectiles as part of a fundamental investigation of the application of an oblique detonation wave engine and a high-efficiency detonation wave combustor as a power generator. In previous papers we used optical observation to clarify the fluid-dynamic structure of self-sustained oblique detonations stabilized around cone-nosed projectiles. In this study we investigated the criticality for detonation waves. The first expression of the criticality was a mean-curvature coefficient, a rate between a detonation cell width and a mean-curvature radius in which the normal velocity component was the Chapman-Jouguet (C-J) velocity, of 5.03. The mean-curvature coefficient was constant and did not depend on the type of fuel mixture (H 2 /O 2 /Ar or C 2 H 2 /O 2 /Ar), initial mixture pressure, projectile diameter, projectile velocity, or diluent mole fraction. We obtained a more accurate mean-curvature coefficient for stabilized, oblique detonation around symmetric spherical bodies in highly krypton-diluted acetylene/oxygen mixtures that have extremely low C-J velocities. The meancurvature coefficient of 7.8 was determined to be the most important value for stabilizing the self-sustained oblique detonation waves around multidimensional bodies. Based on, experimental results obtained at high-and low-projectile-velocity ranges, it may be concluded that a lower-velocity projectile can stabilize a self-sustained oblique detonation wave more effectively than can a higher-velocity one. In the high-projectilevelocity region, the experimental critical condition is inconsistent with Lee's detonation initiation theory, We propose a semiempirical criticality, equation for the stabilization, which was the secondary expression of the criticality and identical with present and past experimental results.

Skipping projectile water target

Abstract: A game to be played on bodies of water comprising a floating target and projectiles which are skipped across the surface of the water toward said target by the participants in the game, differing objectives being defined by the nature of the target, the nature of the projectiles and the relationship of the projectiles to the target.

A Mechanics Approach to Projectile Penetration

Abstract: : In the program reported in the paper, a mathematical model was developed which describes the mechanism of the normal penetration of metallic targets. The model considers all the forces acting on the projectile during penetration, bearing in mind that it is deformed during the penetration and that its effective mass increases during penetration due to the concomitant motion of part of the target mass. With the aid of the mathematical expressions the projectile's velocity after perforation can be calculated by substituting the information on the cavity diameter obtained experimentally. Another part of this program consisted of a series of penetration experiments. The experimental results for the velocity drop due to normal perforation of metallic plates were compared with the mathematical model. (Author)

Anti-material projectile

Abstract: An anti-material projectile of trangible alloy for fragmenting due to impact shock on hitting a target thereafter penetrating the target causing damage. The projectile is preferably high density frangible alloy having a ratio of compressive to tensile strength of 20 to 1. The projectile is useful against soft targets suct as aircraft as well as armor targets where initial impact is at the armor plating. The projectile may be a composite of pyrophoric windscreen with a projectile body of frangible alloy and armor piercing alloy.