Showing papers on "Projectile published in 1971"

Target measurement system for precise projectile location

Abstract: A target system for measuring the location and diameter of a projectile in a frame of reference, including vertical and horizontal banks of light sources for projecting collimated beams of light across the target area, and corresponding vertical and horizontal banks of light receptors for indicating the location and diameter of a projectile passing through the target frame. A plurality of light receptors receive impinging light from each light source, each light receptor receiving a predetermined portion of a corresponding collimated light beam. When a light beam is interrupted by a projectile, the light receptors indicate the location and diameter of a projectile in increments less than the width of the collimated beam. Output signals from the light receptors are converted to numerically coded signals by coupling the output signals from the light receptors to a plurality of amplifiers, less in number than the number of light receptors, according to a predetermined coding pattern.

Projectile and cartridge arrangement

Abstract: A projectile having a guard ring of circumferentially spaced posts encompassing a convex nose rupture disc and web. The projectile is mounted in a case with the nose extending in exposed condition beyond the open case end. A dual diameter chamber high-low propellant firing and gas expansion arrangement is utilized in the cartridge in conjunction with the reduced diameter tapered and finned rear end of the projectile.

Projectile with differential tandem shaped charges

Abstract: A projectile utilizing tandem shaped charges is produced, said projectile having superior armor penetration power than previous shape charge projectiles. The invention described herein may be manufactured, used and licensed by or for the Government for govermental purposes without the payment to us of any royalties thereon.

Plate impact and plastic deformation by projectiles

Abstract: The problem of plastic deformation of thin plates struck by blunt projectiles but not perforated is considered. A streak camera and moire technique were developed to measure the deflection as a function of time for the first few hundred microseconds after impact. The maximum radial strain is about three times the yield strain, the maximum tangential strain is very small. From these and other considerations it was found that there are three main regions of deformation. Since this is a traveling-wave problem, there is a radius beyond which there is no deformation. Inside of this is an annular region traversed by elastic bending waves of the Boussinesq type. Inside of this is an annular region whose dynamic behavior is governed by a membrane stress equal to the tensile yield stress and whose outer boundary travels at a wave velocity governed by the membrane equation. The inner region is a circular region of the diameter of the projectile and traveling with it. The projectile slows and comes to a stop after about 200 or 300 μsec. After this, the material unloads elastically; this elastic vibration behavior was not investigated. Both the time-displacement curve for the projectile and the displacement as a function of radius for specific times can be calculated numerically for dimensionless radius and dimensionless time for one parameter which is governed primarily by the projectile relative mass. The measured and predicted displacements agree within a few percent, except near the boundary between the plastic and the elastic region, for all times up to when elastic unloading commences.

Nose ogive for nonlethal projectile

Abstract: A munition assembly comprising a primer, propellant, fuze, chemical agents positioned in a cartridge case and projectile, said projectile fitted with a nondestructable polymeric impactattenuating nose unit, said nose unit is designed to absorb the kinetic energy in the projectile to reducing the lethal potential of the projectile when fired and physically contacting personnel.

Target cups in ten pin configuration and projector having force varying capability

Abstract: An aerial bowling game has a target assembly with open receptacles arranged in a tenpin configuration and an upright backboard behind the receptacles to deflect a projectile into a desired of the receptacles according to the skill of the player. An improved catapult-type projectile launcher tosses the projectile toward the target assembly with a preselected force, the scoring of the game closely following that of bowling. The launching catapult arm is biased to vary the force of launch. An independent biasing element is also supplied to hold the launching arm in place by a trigger member.

Self-propelling projectile for firearms

Abstract: A self-propelling projectile comprising a projectile body at the normally forward end of said projectile, a propellent charge at the normally rearward end of said projectile, and a primer element located between the ends of said projectile for ignition by side firing or percussion; there being means for maintaining said components in integrated relationship and with communication between said primer element and said propellent charge whereby upon explosion of said propellent charge the force of the latter will be directed against the base of the projectile body.

Launching device for projectiles

Abstract: A launching device for a projectile comprises a barrel having an interior projectile chamber directly adjacent a muzzle opening at one end. The projectile is positioned behind the muzzle opening and is sealed from a propellant chamber directly behind the projectile chamber by means of a sealing member which permits expansion of the propellant chamber during the discharge of the projectile through the muzzle opening. The sealing member moves outwardly along the interior of the barrel, but is maintained in sealing engagement with the barrel to close off the propulsion chmaber even after firing of the missile. In one embodiment, the sealing member comprises a piston which moves along the interior of the barrel and is retained at the outer end thereof by retaining elements formed inwardly at the muzzle opening. In another arrangement, the sealing means comprises a membrane having its outer edges sealed around the periphery of the end of the barrel at the muzzle opening but extending backwardly to envelop the missile and to seal off the remaining portion of the interior of the barrel from the missile at the propulsion chamber. The propulsion chamber may be sealed at opposite sides by a piston arranged on each side of a propulsion charge or means for generating and introducing high pressure gases between the piston at each end. Instead of a piston, the device may comprise a membrane which is engageable with the barrel or even a flexible member in the form of a bellows which is secured to the interior of the barrel and expands outwardly in one or both directions.

Barrel cleaning device

Abstract: A device for removing material from the bore of a firearm including a primed shell case for mounting in the chamber of a firearm, a projectile mounted within the shell, and a wad mounted within the case between the primer and the projectile. The projectile comprises an axially compressed cylindrical portion of open, low density randomly woven resilient organic material capable of intimate contact with the bore of a firearm to remove foreign material, moisture, and powder residue upon propulsion through the bore by detonation of the primer.

Sabot spin-stabilized projectile

Abstract: In a preferred embodiment, a sabot-type spin-stabilized artillery projectile tapering from a pointed nose to a largerdiameter body of columnar shape continuous with a flare base of circular cross-section, the flaring base flaring preferably at a flare angle of between about 4.5* to about 9*, the length of the flaring base as measured along the projectile''s longitudinal axis ranging from preferably about 8 to about 22 percent of projectile length, where the length of the projectile ranges from about 8 to about 12 calibers with a body diameter (of the columnar shape) of about 0.8 to about 3 inches - where a ''''caliber'''' is the diameter of the columnar body.

Assembly comprising a self-propelled finned projectile and its case

Abstract: The invention relates to an assembly comprising a self-propelled finned projectile and its case that is successively used as a container and as a launching tube. This assembly is fitted at its rear end with an insertable member which can be ejected under the effect of the thrust of the propellant gases of the projectile and which locks at least one movable part of a coupling, that is carried by the rear end of the said projectile, to a fixed part of this coupling that is carried by the rear end of the case. All the elements of this fixed coupling part which projects into the interior of the case are ejected under the effect of the thrust of said gases.

Weapon system for a set in-flight digital time fuze with muzzle action

Abstract: An improved rapid fire weapons system that permits a projectile while in flight to be safely and accurately set and armed for either muzzle action or long distance detonation of the projectile against either moving or stationary targets by a coded high frequency transmitted pulse or in the event of an electrical failure by a hand settable switch to muzzle action

Gun for propelling a drug or medicine projectile

Abstract: A gun assembly for firing projectiles or darts includes a projectile barrel connected to a modified conventional small bored rifle. A gas transfer block connects the barrel wth the rifle to convey exploded expanding gas as a source of propulsion. A restrictive orifice is valved in the transfer block and pressure relieving ports are provided to vent exploding gas and thereby control the velocity of the projectile. A bolt actuator mechanism on the projectile barrel provides an over center locking rod and O-ring sealed bolt for sealingly inserting a projectile into the barrel.

Low velocity projectile penetration

Abstract: Rigid right cylindrical projectiles were dropped normally into the sand at velocities less than 25 fps. A relationship between the impact velocity and maximum penetration is obtained by assuming that the kinetic energy lost by the projectile during penetration process is spent on imparting momentum to and overcoming the structural resistance of sand mass. Projectile velocity and deceleration during penetration are also described. Static penetration tests were carried out to determine the coefficients used in the investigation. The experimental and analytical results agree fairly well.

Projectile for an infantry rifle

Abstract: The invention comprises a projectile for an infantry rifle or a light automatic weapon which comprises a solid projectile body made of soft iron made of an alloy of low carbon steels with less than 0.04% of carbon, 0.20% manganese, 0.05% to 0.18% of aluminium, 0.035% of phosphorus and 0.035% of sulphur, while the caliber is below 5.56 mm., preferably 4.00 mm.

Gravity-Induced Angular Motion of a Spinning Missile

Abstract: : The usual analysis of the steady state angular motion of a dynamically stable spinning missile assumes a quasi-steady state calculation of a gravity-induced trim angle. A condition for the validity of this quasi-steady state assumption is derived. When this condition is not satisfied, the gravity- induced angular motion must be described differently for three distinct portions of the trajectory: the upleg, near apogee, and the downleg. The accuracy of this description is checked by comparison with numerical integrations. Finally the influence of cubic static and Magnus moments on the motion is determined and a revised point mass trajectory model is constructed.

Low velocity cartridge having total propellant ignition

Abstract: An ammunition round is provided with a high pressure chamber containing the propellant which is contained therein by a piston or pusher sabot having contact with the projectile. The inertia of the projectile is applied against the force of the propellant gasses when the propellant is ignited to delay the release of the propellant gases from the high pressure chamber to a low pressure chamber rearwardly of the projectile until the propellant is entirely ignited.

Sub-caliber projectile

Abstract: A projectile has a sabot including a plurality of separate angular segments secured in place around the projectile by an annular band surrounding the segments. The segments and the projectile, and the segments and the band, have intermeshing surfaces to enable thrust and spin to be imparted to the projectile by the sabot. The projectile may have a pair of such sabots, one sabot being mounted adjacent to the rear end of the projectile, and the other sabot being mounted in a forward position.

Projectile storing and transporting structure

Abstract: Projectiles are supported in parallel rows with the projectiles facing downwardly and having their tail portions spread apart Each projectile is supported by a ring which extends around its largest diameter and an opening in a plate below the ring, the opening having its axis aligned with the axis of the ring Each ring and opening pair supports a projectile with its axis at an oblique angle to the surface of a support plate to which the rings and plates in which the openings are formed, are secured The arrangement is such that the topmost projectile of a vertical row is supported with its axis at a relatively small angle to the surface of the support plate, the next projectile is supported with its axis at a greater angle than the first projectile, etc, so the tail portions of the projectiles are spread apart in fan fashion and are readily accessible The rings to support successive projectiles of a row are spaced apart by a distance equal to the diameter of a ring The support plate is provided with suitable straps to carry the storing and transporting arrangement on the back of a man like a knapsack

A Technique for Determining and Illustrating the Trajectory of Bullets

Abstract: A discussion of the technique employed in the development and interpretation of a paint fracture pattern which is generated when a projectile comes into violent contact with a painted malleable material.

Projectile having changeable outer form

Abstract: An explosive projectile member comprising a flexible explosive enclosed in a flexible envelope or casing that enables the whole projectile to change its size and shape from the condition that it was in before launching to another condition after launch. The projectile member is of such construction that it can be compressed to such an extent as to enable it to be placed in a narrow pocket in a mother projectile and/or can be expelled from a short firing tube. After the projectile member has been expelled it is spread out or developed by means of the air drag and elastic forces assisted by additional resilient means provided in the elastic casing.

Expendable case shotshell

Abstract: An expendable cartridge made of thermoplastic material which is adapted to contain the necessary propellant, projectile charge, etc., and which is explosively expelled from the gun along with the projectile charge. There are several modifications of the invention, each of which requires some means to slit, fracture, or rupture the outermost cartridge structure, which then permits the inner structure to be released thus facilitating the ultimate final release of the projectile charge from the expendable cartridge, which then falls to the ground much like conventional shot containers.

Projectile for training ammunition

Abstract: Training ammunition in the form of a projectile having spin braking means arranged in the front part thereof. The spin braking means includes a central bore extending from the tip of the projectile partially therethrough with the rear portion of the central bore being in communication with the outer surface of the projectile via discharge channels arranged about the central bore. The rear portion of the central bore is provided with a deflecting lobe having a cross section which increases rearwardly for directing the air flow into the discharge channels in order to minimize turbulence in the air flow. The central bore and discharge channels operate in the manner of a rotary compressor with radial rotors in that air flow therethrough during the flight of a spin stabilized projectile effects braking of the projectile in a predetermined manner to reduce the flight range of the projectile. With known flight characteristics of a projectile, the cross-sectional size of the central bore and discharge channels can be selected to produce a predetermined braking effect and a predetermined flight range for the projectile.

Projectile deceleration device

Abstract: A TUBULAR MEMBER DISPOSED TO RECEIVE A PROJECTILE IN FLIGHT IS PROVIDED WITH A CLOSED END AND SUPPLIED WITH COMPRESSED AIR TO OPPOSE PROGRESS OF THE PROJECTILE IN THE MEMBER AND BRING THE PROJECTILE TO A STOP. A RELIEF VALVE IS PROVIDED TO RELIEVE THE AIR PRESSURE AS THE PROJECTILE COMES TO THE STOP TO PREVENT REVERSE PROGRESS THEREOF. D R A W I N G