Abstract: A protective circuit for protecting electrical equipment. The circuit has a eat sensor for sensing heat from the electrical equipment, an amplifier for amplifying the sensor voltage. The circuit also has a power supply, a heater, and drive transistor for conducting current from the power supply to the heater due to amplified sensor voltage on the drive transistor. The circuit further has a heat sensitive switch that has a switching temperature. The heat sensitive switch is between another power supply, for the electrical equipment, and the electrical equipment. The heat sensitive switch initially conducts electrical power to the electrical equipment. The switch will interrupt electrical power to the electrical equipment, after a selected rate of heat from the electrical equipment activates the circuit to cause the heater to produce a switching heat. This switching heat from the heater raises the temperature of the heat sensitive switch above its switching temperature.

Abstract: A submarine launched missile generates undesirable stress on the rocket nle hydraulic control system at the moment of ignition of the rocket motor. This stress can be minimized by operating the system so that the nozzle is near center and the hydraulic actuator valves are open at ignition.

Abstract: A reentry body nose tip constructed from materials and produced by a proc such that shape stability is maintained under ablative erosion occurring during atmospheric reentry.

Abstract: Stress from the ignition of a rocket is transferred from the rocket nozzle o the actuators and flexible joint seal which move the nozzle causing potential failure of the actuators. This stress can be relieved by using a snubber in the form of a flexible hollow conical toroidal bladder filled with incompressible fluid fitted snugly between the nozzle and the main body of the rocket. Such a snubber transfers the stress to the main body of the rocket through the snubber while deforming to allow the rocket nozzle to slew in response to control commands.

Abstract: Apparatus and method for detecting a location of a break in a conductor of cable, the cable having a multiple number of conductors. The conductors that are not under investigation are connected to ground potential. The conductor that is under investigation is connected to a timer, a resistor, and a DC voltage source that in turn is connected to ground potential. Charging current flows into the conductor under investigation. The time that it takes for the current to decrease to (1/e) of the current's initial value is measured by the timer. Alternately, the conductor that is under investigation is connected to a resistor and a DC voltage source that in turn is connected to ground potential. This conductor is also connected to a voltage level timer that is connected to ground potential. The charging voltage of the conductor increases. The time that it takes for the charging voltage to increase to (1-1/e) of the voltage value of the DC voltage source, is measured by the timer.

Abstract: A solid propellant to inhibitor bonding system for use in replaceable prolant grain assemblies is used with an inhibitor sleeve that has one end attached to an end closure having interior insulation, made of the same rubber insulation material as the inhibitor, and forming a cylindrical cavity for receiving a poured propellant mix. The bonding system is employed prior to pouring the propellant mix. This bonding system involves cleaning the interior surface of the cavity with freon solvent and brush applying a barrier coat, comprising an epoxy resin with amine curing agents, to the interior surface of the cleaned inhibitor. The barrier coat is then cured and a liner is then brush coated onto the cured interior surface of the barrier coat. The liner is then cured and the propellant is then cast into the cavity formed by the lined inhibitor sleeve and insulated closure.

Abstract: A coating slurry comprised of 42 percent silicon and 10 percent chromium metal powders; 45 percent lacquer base including toluene, xylene, and a polymeric binder; and 3 percent antisettling agent. After the slurry has been applied and then subjected to a high temperature vacuum processing, a ceramic coating is obtained which provides 3000.degree. F. high temperature oxidation protection for a refractory tantalum alloy substrate.

Abstract: An array of nested sets of electromagnetic coils. Each set of two coils is useable both as Helmholtz coils and as deGaussing coils. In each set, the two coils are wound in the same direction and the two coils are on a common axis. The common axes of the three sets are mutually orthogonal. For each set of two coils, the outer two ends of the two coils are connected to two single terminals, while the inner two ends of the two coils are connected to one common terminal. By connecting one side of a DC power supply to one single terminal, and by connecting the other side of the DC power supply to the other single terminal, each set of two coils will operate as Helmholtz coils. By connecting one side of a DC power supply to parallel variable resistors, each resistor in turn being connected to a single terminal, and by connecting the other side of the DC power supply to the common terminal, each set of two coils will operate as deGaussing coils.

Abstract: An improvement in a coprocessor system for correcting for drifts in directions of navigation gyros, by means of satellite navigation information from global positioning satellites. Values of gyro navigation information from the gyros are interpolated to values that are valid at a cycle time. A cycle time is a time when the satellite navigation information is valid. The interpolated gyro navigation information is coprocessed with the satellite navigation information to arrive at accurate gyro drift terms. The gyro drift terms are used in correcting for the drifts in the navigation gyros.

Abstract: A probing system for determining a voltage at a node during normal operation of a circuit. An input driver drives the circuit normally. A normal output on an output line associated with the node, is recorded. A probe is brought in contact with the node. Various node voltages are applied to the probe and thus to the node, until the output on the output line matches the recorded output. The probe voltage that creates the match is the voltage at the node, during normal operation of circuit.

Abstract: A cost effective, efficient thermal insulation composition that will have ng shelf life and withstand severe high temperature and pressure conditions in high temperature solid propellant gas generators can be formed of an ethylene propylene, diene monomer (EPDM)/neoprene rubber binders containing silica powder filler and aramid fibers. The specific chemical constituents include EPDM elastomer, 2 Chlorobutadiene 1,3 elastomer, Silica hydrate, Polymerized Trimethyl Dihydroquinoline, Alkylated Diphenylamines and Diphenyl-p-Phenylendiamene, 40% a,a' Bis (Tert-Butylperoxy), Diisopropylbenzene, Napthenic Process Oil, Synthetic Polyterpene Resin, Aramid Fiber (0.25 inch), and Zinc Oxide, Technical.

Abstract: It is useful to be able to place a thermocouple in a plug in a spacecraft heat shield without disturbing the heat flow to the thermocouple. The thermocouple wire is ceramic coated before placement in the plug and a thin metal disc is placed in the bottom of the hole. The thermocouple wire is pressed into the disc to obtain good thermal contact.

Abstract: A position and velocity determining system, that uses two functioned receiver-transmitters. In performing a first function, each receiver-transmitter transmits an acoustic pulse at a unique frequency, in response to a first received accoustic pulse. In performing a second function, each receiver-transmitter transmits a continuous acoustic signal at a unique frequency, in response to a second received acoustic pulse.

Abstract: A transponder that responds differently to two different input signals. The first input signal is at a first frequency. The first input signal is detected by a first powered detector that operates at the first frequency. The transponder responses in a first mode to the first input signal. The second input signal consists of short pulses at the first frequency and at a second frequency. The transponder responds to short pulses at the first frequency by powering a second detector. The first and second detectors then detect the second input signal. The transponder responds in a second mode to the second input signal.

Abstract: A device of monitoring propellant burning within, and erosion of, a rocket motor case by measuring the voltage-induced capacity of gages on the external surface of the case is described. A burning propellant generates a conducting gas within the burn front inside the motor. The resultant voltage is caused by an injected voltage pulse on a metal igniter ring in contact with or capacitatively coupled to the gas.

Abstract: A light emitting diode lamp that operates directly from an AC input. The lamp has an even number of light emitting diodes that are disposed on a cylindrical cluster plate. The diodes are separated into two halves that are conductable in opposite electrical directions. The two halves of diodes are connected at two terminals. The diodes are arranged in a circular configuration near the edge of the circular cluster plate. Leads are connected to the terminals. The leads extend toward the center of the circular configuration and extend through the cluster plate. A modifying resistor is connected between one lead and an end terminal of a lamp housing. The other lead is connected to a base terminal of the lamp housing.

Abstract: An apparatus for housing an explosive bridgewire, wherein the explosive bridgewire works in combination with both a multiple flyer disc containing a plurality of flyer elements and a tapered barrel element for directing the flyer elements toward an impact explosive.

Abstract: A solid propellant rocket motor propellant grain configuration having a center bore of a varying diameter, ballistic slots, a stress/ballistic groove, and a burn inhibitor band for withstanding service motor operating environments and providing the required ballistic profile.

Abstract: This invention relates in general to fabricating fiber-reinforced membranes sing elastomeric materials and, in particular, to a filament winding process suitable for fabricating flexible fiber-reinforced membranes for inflatable depolyable or expandable structures capable of sustaining high structural loads or providing thermal insulation to the structure. The invention relates especially to a filament winding process for fabricating a flexible membrane which may be inflated to provide a conically shaped deployable nose fairing for a missile.

Abstract: A deflectable trunnion assembly that has a deflectable eye member or hook. The trunnion assembly is connectable to a pulley block of a hoist. The trunnion assembly has a trunnion block on which a deflectable spherical roller thrust bearing rides. The eye member rides on the spherical roller thrust bearing. The trunnion block is covered by a cover that contains a dome. The eye member ends in a pin that has a balled end. The balled end of the pin rotates within the dome, during deflection within the spherical roller thrust bearing of the trunnion assembly.