Abstract: The disclosure illustrates a closed loop aircraft transmission test set comprising a variable speed DC motor driving a speed changing gear box whose output shaft is coupled to the input of the transmission under test, the main output shaft of the transmission being coupled to a DC generator load, the output of the generator being used to supplement the input electric power used to operate the DC driving motor thus assuring power drain from the supply busses is only the amount needed to overcome system friction and efficiency losses.

Abstract: This invention concerns a programmable counter which can be preset to provide an output indication one pulse after the count of the incoming signal pulse train has reached the integer M, where M equals any binary real number over the range (0, 1, 2, 4, 8, 16, . . ., 32,768). The programmable counter can be preset to any one of the binary numbers using a 4 digit word.

Abstract: 1.

Abstract: A gas turbine engine is described in which a compressor, combustor and turbine are arranged in series flow relationship. The compressor discharge is outwardly angled. This pressurized air is then introduced into a toroidal combustion chamber of the combustor to create an annular vortex within which the combustion process is maintained. The hot gas stream generated is discharged from the combustion chamber to a centripital turbine which drives the compressor rotor. A portion of the pressurized air is introduced into the combustion chamber adjacent the hot gas stream discharge exit and in general flow opposition thereto, to dilute the hot gas stream and confine the combustion process within the combustion chamber, thereby minimizing the possibility of overtemperaturing the turbine. The combustor housing also defines the outer bounds of the hot gas stream flowing through the turbine. A power turbine converts a major portion of the energy of the hot gas stream to a motive shaft power output.

Abstract: A low pollution combustor is shown for controlling gas turbine pollutant emission, especially NO.sub.x. Fuel is injected and mixed with air upstream of the combustion zone. An axially movable baffle controls the air flow so that the fuel-air ratio is precisely controlled passing into the primary combustion zone. A baffle recirculation zone prevents overheating of the walls. Dilution air is provided downstream of the primary zone for temperature dilution of the gases and to inhibit further formation of nitrogen oxides.

Abstract: A relay multiplexer for low level analog signals is disclosed. To provide a low cost system, inexpensive reed type relays are used. Such relays provide a high capacitive coupling from the relay contacts to the relay coil and thereby degrade the AC common mode rejection of the multiplexer. Common mode rejection is enhanced in accordance with the disclosure by (1) using an optical coupling to the relay switch and (2) slaving a floating relay power supply to the guard potential of the selected channel.

Abstract: A dual cycle turbine system is presented which includes a combination of two engines with different cycle pressure ratios. The two engines are cross connected by a common regenerator that enables low specific fuel consumption under partial load conditions.

Abstract: Apparatus is disclosed which provides an improved means of measuring the operating characteristics of a multiplicity of thermocouple reference junctions. The apparatus allows accurate sensing of temperature through use of both a measurement and reference junction thermocouple arrangement. The reference junction thermocouples are collectively encased and surrounded by an insulating medium which on one side abuts a metal plate serving as a heat sink of appreciable mass. The operating temperature of the heat sink is then monitored by a temperature sensitive resistor. Voltage drop across the resistor is convertible into a measure of system calibration.

Abstract: The time-to-go of the fuze of an artillery shell is digitally set after the round has been fired but before it leaves the muzzle of the gun. The communications link for setting the fuze includes a transmitting coil mounted on the gun muzzle and a receiving coil mounted on each shell round. The transmitting coil is energized with a plurality of signals on discrete frequencies. The output from the receiving coil is detected to derive one binary digit representing each discrete frequency. All the binary digits, "0" or "1", are simultaneously set into a binary counter in the fuze, so that the binary number represents the time-to-go.

Abstract: Electrolytic process and apparatus employs the shroud and depending blades as anodes about a multi-cathode device in a bond material solutionizing electrolyte for obtaining proper contour smoothness without structural depletion of the shroud and/or blades.

Abstract: The invention is directed to a method of making a high strength-high modulus boron filament on a carbon substrate which is coated with pyrolytic graphite. Boron is deposited over the pyrolytic graphite. A preferred method of making such a filament citing specific pyrolytic graphite deposition temperatures is described.

Abstract: A gas turbine engine is constructed having a forward differentially geared power output with an adjacent inlet for the introduction of airflow to the engine. After the airflow is compressed, it is discharged into an annular regenerator which is heated by exhaust gases. A reverse flow can-type combustor is located within the annular regenerator and receives the preheated air therefrom. The exhaust gas from the combustor is directed forward, first, to the power turbine and then to the gasifier turbine, after which it is exhausted through the regenerator.

Abstract: An infrared radiation suppressor secured to the discharge end of a gas turbine engine has a series of movable vanes maintained in an open trailing edge configuration in which they form converging flow passages for the gases emanating from the gas turbine engine and passing between the vanes, thereby decreasing the gas static pressure at the vane trailing edges below ambient levels. Flow passages in heat exchange relationship with the duct walls of the suppressor carry ambient air through the passages to a point downstream of the vanes. The lowered static pressure at this point causes ambient air to flow through the passages and into the gas stream, thereby cooling the duct walls and the gas stream. The hollow center of the movable vanes are also open to ambient air at the outer ends. The lowered static pressure at the vane trailing edges also causes large quantities of ambient air to enter into the hollow vanes and out the trailing edges into the gas stream further cooling the gases.

Abstract: The invention covers a laminated composite shaft formed by blending composite materials having high-bending modulus reinforcements with materials having a lesser or intermediate bending modulus. The shaft comprises a plurality of windings superimposed one upon the other. The windings having reinforcements with a high-bending modulus are sandwiched in between windings having reinforcements with an intermediate bending modulus. The orientation of the reinforcements within the composite materials in relation to the axis of the shaft are disclosed.

Abstract: A refractory substrate, which generally is graphite or carbon is overcoated with silicon carbide by chemical vapor deposition from gaseous sources of silicon and carbon. The deposition generally takes place in combination with hydrogen and the coating on the substrate generally has a thickness at least equal to the diameter of the substrate itself. A silicon carbide filament containing an inner and outer surface layer of carbon rich silicon carbide, together with a method of making the same, is described.

Abstract: A filamentary reinforcement product for composites used in applications requiring high strength and high modulus of elasticity materials, particularly under high temperature service conditions, comprises one mil thick or thicker coatings of boron or boron carbide on a substrate which comprises about a one mil diameter carbon substrate having a catalytically transformed skin layer of highly oriented graphite formed from the carbon substrate using a boron catalyst.

Abstract: A heat suppressor for a gas turbine engine is mounted on an aircraft by means separate from the engine mounts. A sleeve apparatus is needed to connect the exhaust duct of the engine to the suppressor duct for continuous flow of turbine gases. The sleeve apparatus is in the form of a bellows to absorb bending forces created by flexing of the air frame. This invention provides a unique connecting assembly to connect the bellows to the engine. The assembly consists of an annular socket fixed to the bellows and constructed to receive a radially extending flange on a connecting shroud fixed to the engine. The flange and socket are slidably engaged to allow twisting movement between the bellows and the engine, while the bellows allows relative displacement of the axes of the connecting passages.

Abstract: Extracorporeal blood pumping apparatus for use, for example in cardiopulmonary bypass procedures, left ventricle assist, hemodialysis and the like. The pulsatile pump apparatus may comprise an elongated driver balloon and a similar blood pumping balloon positioned side by side in a rigid casing or housing having preferably a one-way air valve. The inlet and/or outlets of both balloons are off-set and sloping ballon end portions are provided, inter alia, to minimize folding and/or rubbing during use. The driver balloon is provided with a port for coupling to a pressure-vacuum source and the blood pumping balloon is provided with an inlet port and an outlet port and both balloons are of such a cross sectional size and construction as to provide non-occlusive action by the blood pumping balloon.

Abstract: A multiplicity of retractable spoilers are placed at spaced angular intervals within the annular duct which carries the bypass airstream in a turbofan engine. Deployment of the spoilers into the bypass annular duct causes a partial blockage of the airstream. This results in a decrease in thrust from the engine without any change in throttle setting.

Abstract: In order to provide a frangible projectile for use in aircraft target practice, a combination steel and plastic projectile is constructed. This unit consists of a steel cup into which a glass reinforced plastic ogive is injection molded. During the same injection molding process, a plastic rotating band is installed around the periphery of the projectile.