A nozzle assembly for gas turbine power plants, particularly aircraft jet engines, which incorporates a generally annular splitter dividing the nozzle into two parts and provided on its surface with suitable sound-absorbing material. Incorporated into the splitter and forming a part thereof is apparatus for varying the cross-sectional area of the nozzle exit and, hence, the operating characteristics of the power plant. This latter means preferably comprises a plurality of arcuate segments hinged...

The shank or preformed head of a rivet to be driven cold and having a shank which is cylindrical over the major portion of its length has a portion reduced in size adjacent to an end to be headed in driving, such as by being stepped or necked or the underside of a preformed head on such shank is grooved adjacent to such shank. The reduced portion is located at the end of a hole in which the rivet shank is inserted so that mushrooming of the rivet into engagement with the hole end is deterred and...

An apparatus utilizing electromagnetic energy for producing high impact forces by means of a ram propelled against a work piece. A specific utilization of the apparatus is in the installation of fasteners such as rivets in structural assemblies. The apparatus described herein is the work center of an electromagnetic impact tool and comprises the following components: electromagnetic high energy pulse coil, ram means, aerostatic bearing means and connector means.

A system for controlling flow through a passageway located in the aft 30 percent chord region of an aircraft wing airfoil to change the aerodynamic flow pattern during ground roll conditions, and thereby spoil lift, generate a downwardly acting force to increase the effective aircraft weight on the wheels, increase drag, and create thrust reversal by redirection of engine exhaust gases. The preferred embodiments involve unique flap means which may be actuated into position to intercept flow bene...

A frequency selective damper for damping the low frequency natural lead-lag vibrations of an articulated helicopter rotor blade while leaving essentially unaffected the induced one per revolution frequency motion when the rotor is subjected to the combination of these motions. The damper comprises a hydraulic cylinder, a metering-type load valve connected via flow paths to either side of the cylinder piston, a three-way spool valve connected via flow paths to the load valve and to the flow paths...

A three chamber sterilization efficiency detector having a first chamber containing viable organisms that are subjected to the sterilization process; a second chamber separated from the first by an openable partition containing nutrient media; and a third chamber separated from the second by a semi-permeable partition containing means for detecting the products of the life processes of the organisms. After sterilization, the openable partition is opened to allow the nutrient media to contact the...

An analog memory capable of write-in at a relatively low rate and independent, nondestructive read-out at a relatively high rate. A single write-in and read-out address logic is provided for as memory units are desired. Each memory unit includes a matrix of sample and hold microcircuits, each having an external storage capacitor, an isolation amplifier and independent input and output analog switching in response to vertical and horizontal write-in and read-out addressing.

Two methods are disclosed for forming wire bundles, one method for forming an elongated wire bundle longer than the conventional working table and a second method for forming a shorter wire bundle. An apparatus for carrying out both methods comprises an endless canvas belt stretched between two rollers mounted at the ends of an elongated table, a drawing on rollers at each end of the table and overlying and supported by the belt for moving therewith, and a plurality of wires from reels at one en...

A linear piston type, fluid damped, adaptive shock absorber for an aircraft landing gear strut having an automatically adjustable orifice through the piston. The impedance to the flow of damping fluid through the orifice is controlled by a fluidic vortex valve which utilizes small control jets of high pressure fluid injected tangentially into a circular chamber through which the main flow of hydraulic damping fluid passes. The force of fluid injected through the tangential control jets determine...

A structural joint construction for connecting a first member of composite material to a second member which may be of composite material or of some other material. The construction enables tensile, compressive, torsional, and bending loads to be transmitted from the first member to the second member with a high degree of efficiency. One end of the first member is in abutting relationship with a free end of the second member such that a plurality of ends of first filament material integral with ...