Abstract: A four-ported dump combustor is designed for use with a ramjet engine and ovides high combustion efficiency and pressure recovery for length-to-diameter (L/D) ratios of between 1.3 and 4.4, over a range of operating conditions.

Abstract: A multi-purpose bomblet is designed for accomplishing various military mions. A standoff spike and shaped charged are provided for piercing heavy armor and a fragmentation case surrounds the shaped charge. Upon detonation of the shaped charge, the fragmentation case disintegrates to provide shrapnel which is effective against personnel. An inner liner of incendiary material also surrounds the shaped charge and, upon detonation of the shaped charge, the incendiary material is ignited and dispersed and is useful for starting fires.

Abstract: An extracting tool for removing an electronic plug-in module from a chassis ssembly applies, by mechanical advantage, a large extracting force to a module. An extractor plate engageable with a plug-in module is slidably connected to a frame and a rotatable cam is provided for linearly moving the extractor plate. A handle integral with the cam is used for rotating the cam, and a cam surface on the handle is used to return the extractor plate to a starting position when the handle is moved in a reverse direction.

Abstract: Tapered seals are provided for sealing the ends of a flow-through module ch is mounted in parallel guide rails. Each seal is bonded to the end of a heat exchanger core and is a rectangular wedge having a thinner end at the bottom and a thicker end at the top. A complimentary tapered surface is provided in each slot of a plurality of slots in the parallel guide rails and, when an electronic module is inserted into the guide rails, a wedging action takes place to firmly position a module in the guide rails and seal the air passageway in the heat exchanger core to the guide rails.

Abstract: A heat pipe is provided for transferring heat from a heat source to a heat sink. A check valve, which is operated by very low pressure, is placed in the vapor channel of a heat pipe and allows vapor to flow in a forward direction from the heat source to the heat sink. In the event that the heat sink becomes hotter than the heat source, vapor flow will reverse direction but will be blocked by the check valve.

Abstract: Apparatus is provided for simulating an ocean environment for sonobuoys wh are being tested in a relatively calm body of water. A floating platform is towed through water to simulate a sea current, and a sonobuoy being tested is attached by a cable to the floating platform. A drum, driven by a reversible motor, winds and unwinds the cable to simulate wave action while the floating platform is being towed.

Abstract: A backshell adapter has a terminator which has a plurality of teeth engagle with teeth on the backshell of an electrical connector and a barrel threadedly engages threads on the backshell and holds the terminator and backshell together. The aft end of the terminator has a tapered surface and a clamping sleeve wedges a braided shield against the tapered surface.

Abstract: A positive locking mechanism is provided for securing a plug-in electronic odule in a chassis. A threaded element is provided for attaching the electronic module to the chassis and tightening of the threaded element forces a module connector into engagement with a mating connector in the chassis. A pivotal driver blade is provided for turning the threaded element and, after the connectors are mated, the driver blade is pivoted and a cam thereon actuates wedges which provide a good thermal interface between the electronic module and the chassis. The driver blade also serves as means for extracting the plug-in electronic module from the chassis.

Abstract: An improved transducer for generating and detecting shear waves using pielectric bimorph elements. A plurality of pairs of bimorph elements are formed by rigidly attaching together two individual lengths of piezoelectric material with each dimensioned to provide a length and width substantially greater than its thickness. The plurality of bimorph pairs are mounted in a configuration such that each pair is separated by a layer of high compliance material with the electrical polarization of each piezoelectric element pointing in the same direction. Electrical potential applied simultaneously to the electrodes of the individual pairs causes the entire end face of the transducer to perform a shearing motion which will generate or detect acoustic waves in materials in contact with the face.

Abstract: An improved signal processing technique for providing rapid evaluation of rget echoes on a pulse by pulse basis. An analyzing circuit is constructed to receive pulse echoes from a signal transmitting system and convert the pulses to provide amplitude data through a pulse height to pulse width converter. When used in a radar system, each echo pulse is converted to a fixed amplitude pulse with a pulse width proportional to the echo amplitude as the antenna sweeps by the target. The pulses are thereafter transmitted to a display device in place of the normal radar video. The resultant display provides a real time two-dimensional amplitude pattern which enhances target detectability in the presence of noise and in multiple target environments.

Abstract: A digital apparatus for generating a raster whose scan parameters can be ered and controlled by an external program. In addition to standard horizontal sweep, the raster can display a "waterfall" scan, range bearing sweep and various other geometrical patterns. A selector switch permits the raster scan unit to be selectively connected to either a computer or a control panel which provide the parameters for specifying any one raster.

Abstract: A device for simulating the firing of an automatic weapon by firing bullets oth singularly and in bursts. A timing source provides electrical impulses which are randomly spaced in time and also provides pulses which are closely spaced to represent bursts. The bullets are fired by primers which are programmed by the timing source.

Abstract: An air-cooled contoured plug fitted within the engine tailpipe to physica block any direct view to the turbine section. A vortex cavity is provided around the plug just aft of the plug maximum diameter in order to reduce the length of the cone-shaped plug. The trapped vortex reenergizes the boundary layer built up along the cone surface and allows the flow of hot gases to turn the corner without separating.

Abstract: A converter for converting a high frequency video input signal to a digital signal by detecting the peak voltages of the input signal. A video input signal fans out to a plurality of comparators of which each are connected to a resistive ladder of equal resistors values. One end of the resistive ladder is connected with a positive reference voltage and the other end is connected with a negative reference voltage. Real time is divided into sampling bins determined by the cycle time of a clock and, within each bin, the digital output from a plurality of master-slave flip-flops shows the maximum level reached by the video input signal. The outputs from the flip-flops go to a pair of priority encoders and a multiplexer for indicating in digital form the highest point reached on the resistive ladder.

Abstract: An improved getter for a hydrogen maser comprised of screened particles of zirconium-aluminum alloy. One or more pump bodies are connected with a hydrogen maser and each pump body contains a quantity of Zr-Al alloy particles. One or more screens are provided in a passageway connecting a pump body with a maser to allow passage of hydrogen into the pump body but preventing, in a zero-g environment, the alloy particles from leaving the pump body. The Zr-Al alloy particles are activated by heating.

Abstract: Improved green flare compositions which retain acceptable dominant waveleh and purity and produce efficiencies up to about 11,000 cd-s/g. The flare compositions contain magnesium, barium nitrate, boron and a binder.

Abstract: A rotor hub for a helicopter having a hum member rotatably mounted to a rr mast stationarily attached to the fuselage of a helicopter and forming an air plenum for circulation control. A shaft, which is driven from a transmission, drives a torque plate which is attached to the top of the hub member. A flexible hub plate is attached to a flange on the hub member and has a plurality of axles to which the rotor blades are individually attached. Air from inside the plenum is piped to the rotor blades through flexible ducts. The flexible hub plate is designed to provide a high degree of stiffness in the plane of rotation and a lesser degree of stiffness in a plane normal to the plane of rotation.

Abstract: An improved shuttle valve for providing control of fluid from two alternate ources to a fluid-actuated mechanism. Primary and secondary fluid sources are coupled to supply fluid to a shuttle valve for transmission to a single outlet port. A bias piston having a passage axially extending therethrough is slidably positioned to engage the shuttle and impart movement in response to fluid pressure from the primary source. A bias source is coupled to vary the pressure on the piston and thus change the net bias needed to allow fluid from the primary source to maintain the shuttle in a first position. Initially, when the shuttle is in the first position, fluid flows from the primary source to the single outlet. Subsequently, when the pressure from the primary source falls below a predetermined value, the fluid pressure from the secondary source moves the shuttle to enable fluid flow from the secondary source to the single outlet.

Abstract: A pyrotechnic composition which, when burned, produces yellow smoke and yellow flame. The composition is comprised of between 5 and 30 percent of a fuel which is either magnesium or silicon, between 65 and 85 percent of bismuth subnitrate and between 5 and 13 percent of an epoxy binder.

Abstract: A method for polishing semiconductors, particularly surfaces of CdS. The method is comprised of polishing a substrate with a pad charged with Transene and Cab-O-Sil while an iodine solution is added in small quantities. The last period of polishing is done while flushing the polishing pad with Transene. Upon completion of polishing, the substrate is given an immediate wash with Transene, followed by ultrasonic cleaning in Transene. After the ultrasonic cleaning, the substrate is again rinsed in Transene and then spun dried. The cleaning process is continuous and the cleaning solutions are kept in active contact with the substrate in order to provide a haze-free product.