Abstract: A retainer for attaching a rotating band to a projectile during handling ramming of the projectile. The retainer cooperates with a groove on the projectile and is discarded during firing of the projectile by the force of the charge. An interlocking double split ring forms the retainer with an outer ring having an L-shaped cross-section and an inner ring shaped to fit into the L-shape of the outer ring. Each ring is provided with a split or opening to allow for expansion of the ring over the projectile and into the projectile groove. The outer ring split may be cut at an angle of less than 90.degree. to minimize deflection of the outer ring. The inner and outer rings are assembled with their splits together and then clocked 180.degree. apart. The inner ring is then locked to the outer ring by a locking notch. Hoop stress of the outer ring prevents the inner ring from deflecting at the split such that the retainer is forced to behave as a continuous single ring.

Abstract: A rain erosion resistant protective covering for aircraft having pointed or conical radomes and method of forming the protective covering. The protective covering is a layered material of polyurethane, contact adhesive, and polyethylene which is formed into the desired shape by precutting the material to the shape of the radome, placing the material in a mold, heating the material, and drawing a vacuum between the mold and material to draw the material into the shape of the mold, thus producing a cover having the shape of the mold.

Abstract: A valve for pressurized, liquid sprinkler systems which is adapted for flow esting of the valve without activating the sprinkler system. The valve is constructed with a valve body having a fluid inlet and a fluid outlet connected by a flow passage. The fluid inlet is provided with a supply of pressurized fire extinguishing medium. A cylinder is positioned in the flow passage with a piston slidingly mounted in the cylinder so as to form a chamber with the cylinder. The chamber is pressurized by a sensor-controlled fluid pressure line and controls the position of the piston in the cylinder to open or close the inlet. Pressure in the chamber positions the piston so as to close the fluid inlet. A stem is mounted in the outlet so as to project into the flow passage and through the cylinder to the piston. The stem is attached to the piston on a first end and provided on the other end with a stem extension which projects out of the outlet to a position external to the valve.

Abstract: Apparatus for stabilizing a weapon launched from an aircraft. The weapon is rovided with a plurality of concentric rings mounted on the nose of the weapon for reducing nose lift. The tail of the weapon is provided with a plurality of wedge shaped fins positioned on a decreasing tail diameter which increases the tail stability while minimizing tail lift. The outer faces of the fins are of a multi-tiered construction with angled portions connecting the tiers.

Abstract: An enclosure for a warhead case which prevents a high order detonation of e warhead due to inadvertent initiation from physical, bullet, fragment impact, fire exposure or other factors causing a pressure buildup in the case. The warhead explosive is assembled in a hollow cylindrical warhead case having an open end and a closed end. An enclosure plate is positioned in the open end to close off the warhead in the case. The enclosure is circular and provided with a first plurality of radially extending apertures. The warhead case is provided with a second plurality of radially extending apertures which are positioned to coincide with the aperture in the enclosure plate. A plurality of pins are press fit into the case apertures so as to extend into the enclosure plate apertures and attach the enclosure plate to the warhead case.

Abstract: An unlined Munroe Effect device for breaching structures in urban terrain. he device is constructed as an unlined, linear, shaped explosive charge which directs an explosive jet into the structure. The shaped charge is formed with a honeycombed substrate of metal in which the substrate interstices are filled with and the substrate is covered by an explosive material. The substrate is embedded in the explosive material. The explosive material and substrate, prior to curing of the explosive material, are formed into an unlined, semi-cylindrical shape to create the explosive jet or Munroe Effect. The device is initiated or detonated with a booster charge.

Abstract: An explosive logic safing device for increasing the safety and reliability f a detonation signal from a fuze to an explosive charge. The safing device is provided with an inlet explosive trail which conveys an inlet detonation signal to an outlet explosive trail and the primary explosive charge. A control explosive trail connects the inlet explosive trail and the outlet explosive trail. A failure explosive trail is connected between the control explosive trail and the outlet explosive trail, and is provided with an explosive logic network for conveying the inlet detonation signal from the inlet explosive trail to the outlet explosive trail when a plurality of detonators are properly initiated. The explosive logic network is also provided with a means for registering the successive initiation failures of individual detonators.

Abstract: A turbulence generator is provided on the forward end of a free flight ornce device to induce a turbulent boundary layer over the surface of the device. The turbulent layer generated is thicker than the normal boundary layer and helps reduce drag disparity between similar ordnance devices.

Abstract: A low power expenditure oscillator/driver circuit including a transistor drive and control windings connected thereto and being operatively wound on a magnetic core suitable for use in a fluxgate magnetometer is disclosed. Its low power expenditure feature is provided, inter alia, by including an additional resistor in the base circuit of the transistor portion thereof so as to lengthen the base current pulses which permits their termination to be controlled by saturation of the magnetic core.

Abstract: A projectile ground shock simulator for simulating the force pulse on a pectile in testing for shock effect on the guidance system of the projectile. The simulator incorporates a liquid/solid material as an energy absorbing and storing spring for simulating the force pulse on the projectile. The projectile is positioned in a drop tube and impacted with a drop vehicle to simulate the forces created during firing of the projectile. The drop vehicle is provided with the liquid/solid spring having a piston and cylinder on the impact face of the drop vehicle. The cylinder is filled with a liquid or solid polymer material having a high bulk modulus of compressibility which gives the spring volumetric stiffness. The spring thus duplicates the force pulse acting on a fired projectile and also allows for the drop vehicle to be reused.

Abstract: An explosive auto-enhancement device for providing higher detonation pressure than can be achieved with conventional explosives by the use of magnetic precompression for enhancing the detonation wave. A cylindrical armature containing an explosive charge is coaxially spaced within a helical field generator winding with a first end of the armature being electrically coupled to the helical winding. A "seed" magnetic field is provided to the helical winding prior to the initiation of the explosive charge. When the explosive charge is initiated, forming a detonation wave, the other end of the cyclindrical armature expands and is coupled to the helical winding, thus completing the electrical circuit between the winding and the armature. As the detonation wave continues through the explosive charge, more of the coils of the helical winding are short circuited which reduces the inductance and results in increased magnetic flux within the winding.

Abstract: A ball bearing assembly device for permitting dry assembly of bearings wiut additional equipment. The assembly device is provided with an inner body surrounded by an outer body so as to create a circumferential gap therebetween. The gap is provided with a vacuum connection which allows positioning of ball bearings on a ball bearing shaft or inner bearing ring when the shaft or ring is mounted on the inner body. The bearing shaft is placed into the inner body so as to provide a mounting to aid in insertion of the bearing shaft or ring into the outer bearing ring. The bearing shaft may be mounted on a reciprocating shaft for insertion into the outer bearing ring.

Abstract: A connector for joining a fiber optic cable. The connector is constructed th a thin wall tube enclosing strips of a shape memory alloy material. The strips are bent and inserted into the thin wall tube such that an axial cavity is formed between the opposing strips. The axial cavity provides a self-centering mechanism for positioning fiber optic cables along the central axis of the tube. Dimensions of the tube and shape memory alloy strips are chosen such that fiber optic cables inserted into each end of the connector when it is above the transition temperature range of the strips will be forced into coaxial alignment when the connector is cooled to a temperature below the transition range of the strips.

Abstract: A method and apparatus for measuring the dynamic material constants of rur compounds. The rubber compound is tested in strip form by attaching one end of the strip to an electromechanical shaker while the opposite end of the strip is suspended under constant tension. The electromechanical shaker propagates an acoustic wave in the test strip and a piezoelectric transducer positioned at a first point on the test strip measures the mechanical response of the strip for phase and amplitude. The shaker is programmed to step piecewise over the frequency range from 100 Hz to 40 KHz by a frequency synthesizer. The distance between the shaker and the transducer is changed and data is obtained for a second point on the strip. The test values obtained are used to calculate Young's Modulus and the loss factor for the rubber compound.

Abstract: A controlled environment process for making diode arrays by depositing the sublimate of a semiconductor material through an aperture of a mask placed nearby a substrate and then subjecting part of the sublimate to ion implantation. The aperture causes diffraction of the sublimate vapor stream while the proximity of the edges of the aperture to the substrate causes the central plateau of the deposited thin-film to have a rounded rim leading to sides that taper smoothly in thickness to the substrate. Ion implantation to a controlled depth creates an isolated planar junction. Surface layers of a gold electrode running onto the substrate from different surface areas of the thin-film provide for off-mesa bonding of electrical leads.

Abstract: A method and apparatus for electrical augmentation of steady state detonation waves in solid or fluid explosives. Two electrical conductors are disposed along opposed margins of explosive material and coupled across a source of electrical energy. When the explosive material is detonated and as the detonation wave propagates along the explosive material, electrical energy is furnished across the conductors and into the detonation wave which is more conductive than either the undetonated explosive or detonation product gases. The electrical energy coupled into the detonation wave adds energy over and above that which is normally delivered chemically and thus causes the detonation pressure and velocity to increase and therefore increases the ability of the explosive material to accelerate objects and do work.

Abstract: A system for mooring a buoyant case such as a marine mine or other marine vice at a preselected depth below the surface of the water in which the case was launched. After the case has been launched, and made bottom contact, the mooring system utilizes a first piston assembly in conjunction with a corrodible pin to initiate mooring line payout from a buoyant case to an attached anchor. When the preselected mooring depth is reached, a second piston assembly terminates the mooring line payout and the ascent of the case, thereby resulting in mooring of the buoyant case at the preselected depth.

Abstract: A system for mooring a buoyant case such as a marine mine or other marine vice at a preselected depth below the surface of the water in which the case was launched. After the case has been launched, together with an attached anchor, the anchor and case separate to the extent of a resilient line as they descend through the water. When the case passes through a first preselected depth the resilient line is released from the case, thereby permitting a mooring line, which is connected in series between the resilient line and the case, to payout. As the mooring line unwinds the anchor descends to the ocean floor while the buoyant case ascends toward the surface. When the case ascends through a second preselected depth a brake assembly is activated to stop the payout of the mooring line. After the case has been positioned at the second depth, a locking assembly fixes the position of the case at the mooring depth.

Abstract: A mechanism for immobilizing an arming shaft to preclude axial movement of he shaft until its release is desired, comprising a base and rotor mounted thereon. The rotor holds hardened metal balls in engagement with a circumferential groove on the shaft to lock the shaft in position. The base, rotor and shaft are held in locked position by an arming wire. Compression springs acting between the base and rotor cause relative rotation thereof, when the arming wire is removed, to an unlocked position where the balls can be forced into apertures in the base and release the shaft for axial movement.

Abstract: A variable temperature method for the preparation of single and multiple taxial layers of single-phase (e.g., face-centered cubic), ternary lead chalcogenide alloys (e.g., lead cadmium sulfide, [Pb.sub.1-w Cd.sub.w ].sub.a [S].sub.1-a where w varies between zero and fifteen hundredths, inclusive, and a=0.500.+-.0.003), deposited upon substrates of barium fluoride, BaF.sub.2, maintained in near thermodynamic equilibrium with concurrently sublimated lead alloy and chalcogenide sources. During preparation, the temperature of the substrate is varied, thereby providing an epilayer with graded composition and predetermined electrical and optical properties along the direction of growth. This growth technique can be used to produce infrared lenses, narrowband detectors, and double heterojunction lasers.