Showing papers on "Projectile published in 1987"

Bullet resistant panel

Abstract: A bullet resistant panel defined by an assembly including plural layers of impact resistant fabric and a layer of insulating foam, the assembly being secured within a peripheral frame and laminated between intermediate substrates of cellulosic material and exterior layers of metal. The panel may be used in constructing protective walls or barriers subjected to possible impact by bullets or other high impact force projectiles.

Photoelectric-piezoelectric velocity and impact sensor

Abstract: A photoelectric-piezoelectric velocity and impact sensor has a plurality of photoelectric light sources and associated photodetectors disposed on axes defining an array of light beams. A first electronic circuit is operatively coupled to the photodetectors for generating a signal representative of the moment in time when at least one light beam of the array is broken by a projectile passing through the array. A substantially planar transducer is disposed coplanar with and spaced apart from the array for generating a signal when the projectile strikes the transducer after passing through the array. A second electronic circuit responsive to the signal from the transducer is provided for generating a signal representative of the moment in time when the projectile strikes the transducer. A calculating circuit responsive to the signal from the first circuit and the signal from the second circuit is provided for calculating the velocity of the projectile as a function of the time difference between the signals. The transducer may be divided into a plurality of distinct independent zones, each adapted to generate a signal only when struck by the projectile. If the transducer is divided into zones, a third electronic circuit is provided for generating a signal representative of the zone struck by the projectile.

Electronic sensing screen for measuring projectile parameters

Abstract: A unique electronic sensing screen (44, 105) apparatus for automatically measuring various parameters of moving projectiles. Projectiles pass between an artificial (16, 18) or natural light source and light sensors (12, 14, 118, 176), resulting in signals from the sensors, which are processed into data showing projectile profiles or photo-like images, shock waves, velocity, angle of attack, and dispersion. The apparatus provides quick turn-around times between parameter measurements, such as those of many projectiles fired in rapid succession, and readily usable results.

Method of and apparatus for generating hydrogen and projectile accelerating apparatus and method incorporating same

Abstract: A projectile is accelerated through a barrel by a high pressure hydrogen gas jet that is derived by exothermically reacting water or a water-hydrogen peroxide liquid mixture with metal or a metal hydride. The temperature of the reaction is controlled by controlling the power in a plasma discharge applied to a reaction chamber containing the liquid and particles of the metal or metal hydride. A non-vaporous metal oxide resulting from the reaction is centrifugally separated from the hydrogen that drives the projectile.

Ceramic munitions projectile

Abstract: A ceramic munitions projectile, particularly useful for practice or target munitions is provided. The projectile is preferably made of zirconia which is densified by a pressureless sintering method. The projectile has sufficient toughness to withstand acceleration and torque created during projectile firing and trajectory.

Projectile for attacking a helicopter

Abstract: When attacking a helicopter preferably by means of a tank gun, in order to achieve adequate hit performance despite inaccurate aiming the projectile according to the invention contains a strand arrangement which is spread out close to the target, engages with the helicopter's main rotor and in consequence causes said helicopter to crash.

Projectile containing sub-munitions with controlled directional release

Abstract: A projectile forming the head of a carrier has a defined balllistic trajectory and contains sub-munitions ejected, at a given moment in the trajectory of the projectile, in a controlled direction. In the projectile, the sub-munitions are arranged so as to have a single direction, namely with the head of the sub-munition facing the front of the projectile, in one or more rows. In each row, the shells of the sub-munitions are tangential to one another and their fin systems ar placed in one another in a self-locking way. The projectile further comprises securing means among the sub-munitions and between these interstitial spaces are further filled with a powdery material.

Projectile delivery apparatus

Abstract: A projectile delivery apparatus for enhancing the penetration capability of a projectile including a friable capsule, which traverses the distance from a firearm to a preselected target while retaining the launch weight of the projectile intact, and a projectile, which is mounted internally of the friable capsule and is released from the capsule to achieve increased penetration of the target.

Position measuring apparatus and method.

Abstract: The position of a projectile travelling at a supersonic velocity is sensed by two triangular arrays of transducers 10,11 which are located below and close to the plane of a target area 14 through which the projectile passes. Signals from the transducers are processed to obtain data indicative of the direction of the trajectory from each array. This data can be processed to obtain the position of the trajectory in a cartesian coordinate system.

Apparatus for tansmitting data to a projectile positioned whithin a gun tube

Abstract: An apparatus for transmitting data from the exterior of a gun tube to a projectile (10) positioned within the gun tube (12) utilizes at least two electromagnetic-acoustic transduction devices, one such device positioned on or near the exterior periphery of the gun tube and one such device positioned on or near the interior periphery (16) of the gun tube within the bore. Such data may be used to update target or trajectory information used by a projectile. Transmission of such data, at high data rates, just prior to firing the projectile from the gun tube, enhances the probability of target kill or damage. High data rates, compatible with SMART projectile requirements, are made possible by ultrasonic signal frequencies in the range of about 500 Khz to about 2,500 Khz. Phase-shift-keyed modulation may be employed to impart data onto the ultrasonic signals.

Magnetic reconnection launcher

Abstract: An electromagnetic launcher includes a plurality of electrical stages which are energized sequentially in synchrony with the passage of a projectile. Each stage of the launcher includes two or more coils which are arranged coaxially on either closed-loop or straight lines to form gaps between their ends. The projectile has an electrically conductive gap-portion that passes through all the gaps of all the stages in a direction transverse to the axes of the coils. The coils receive an electric current, store magnetic energy, and convert a significant portion of the stored magnetic energy into kinetic energy of the projectile by magnetic reconnection as the gap portion of the projectile moves through the gap. The magnetic polarity of the opposing coils is in the same direction, e.g. N-S-N-S. A gap portion of the projectile may be made from aluminum and is propelled by the reconnection of magnetic flux stored in the coils which causes accelerating forces to act upon the projectile at both the rear vertical surface of the projectile and at the horizontal surfaces of the projectile near its rear. The gap portion of the projectile may be flat, rectangular and longer than the length of the opposing coils and fit loosely within the gap between the opposing coils.

The fly ball trajectory: An older approach revisited

Abstract: An older approach to the problem of projectile motion with quadratic drag force is presented with the fly ball as an example. In this approach, analytical solutions for the velocity, curvature, and arc length are obtained as functions of the slope angle. It is shown that the velocity and curvature do not have their extrema at the top of the trajectory but during the early phase of descent. The entire problem is reduced to simple integrations over the slope angle.

Tandem charge projectile

Abstract: A projectile with a tandem charge consisting of a borehole charge and a secondary firing charge, in which exact piercing guidance between the borehole charge and the secondary firing charge is obtained by the counterdirectional motion of the housing part with the secondary firing charge relative to a tubular guiding part of the housing.

Electromagnetic launcher with muzzle velocity adjustment

Abstract: An artillery piece which has a gun barrel made up of a parallel rail electromagnetic launcher bore Current from a source is injected into the rails to propel a bridging armature and projectile The velocity of the porjectile is measured as it traverses a certain position within the barrel and the measured velocity is compared with a predetermined desired velocity The velocity of the projectile is modified (if required) toward the muzzle end of the rails as a result of the comparison

High solids ratio solid rocket motor propellant grains and method of construction thereof

Abstract: A high acceleration high performance solid rocket motor grain such as for a ballistic defense missile or rocket assisted projectile comprises a propellant material which includes a highly plasticized binder so that the grain has a solids ratio equal to at least about 95 percent. In order that the grain with such a solids ratio may have adequate strength and withstand high acceleration forces, a reticulated structure is embedded therein. A method of constructing a rocket motor having such a grain is also disclosed.

Thick target fast neutron yields

Abstract: The radiation doses due to fast neutrons from heavy-ion reactions beween a range of 14 different projectiles varying in mass from 6Li to 58Ni, bombarding a plastic hydrocarbon and eleven different elemental thick targets ranging from 7Li to 197Au, have been measured as a function of projectile energy. An array of five BF3 counters in polythene moderators surrounding the target was used to obtain angular distributions. The projectile energies ranged downwards from maximum values of E A = 5.84 MeV/amu for 6Li beams to E A = 0.9 MeV/amu for 11B. The measurements show the expected strong dependence on particle energy and mass. The angular distributions are strongly peaked in the forward direction when the projectile momentum is large and the target light, and more nearly isotropic in the bombardment of heavy targets by light, low energy projectiles. The data have been tabulated for convenience in use and a simple parametrization is proposed.

Projectile forming charge

Abstract: An armor-rupturing projectile-forming charge wherein the charge is adapted to selectively produce either single compact projectile, or through suitable measures to be able to concurrently produce a plurality of projectiles, so as to attack hard or heavily-armored targets, such as tank, as well as or lightly-armored, or even unarmored targets through a projectile which is correlated with the target.

Kinetic energy sabot projectile

Abstract: INVENTORS: HARALD KATZMANN, DAVID AMMANN, PIERRE H. FREYMOND & HANSPETER SIGGINVENTION: KINETIC ENERGY SABOT PROJECTILE ABSTRACT OF THE DISCLOSURE The projectiles posses high kinetic energy owing to the high velocity of the projectiles, on the one hand, and the high specific weight of the projectiles, on the other hand. The heretofore normally employed explosive and incendiary charges are replaced by an inert powder serving as the projectile filling or filler and having a density of at least 10 g/cm3 and whose constituents have a mass of 10-4 to 10-2 grams. Certain constructions of the projectiles contain a fragmentation jacket, the filling or filler, a closure body or penetrator and a projectile tip. Another construction of the projectile contains a fragmentation jacket, the filling or filler, an integrated base for the fragmentation jacket and the projectile tip.