Abstract: A noise suppressor system for attachment to a firearm including a barrel having a longitudinal axis. The noise suppressor system including the combination of: a flash suppressor adapted to be attached to the muzzle of the barrel coaxially therewith, a noise suppressor including a proximal mount assembly having a bore for coaxially receiving the flash suppressor, and a means for selectively coupling the noise suppressor system to the firearm.

Abstract: Low profile folding front and rear firearm sights are disclosed. The firearm sights can be assemblies including a base, an arm, and a sight attached to the arm. The sight assemblies can also include a spring-loaded pivot pin configured to pivotally couple the arm to the base. The sight assemblies can also include a linking pin connecting the pivot and the arm. The linking pin may be inserted into the pivot pin, such that a longitudinal axis of the linking pin intersects a rotational axis of the pivot pin. The sight assemblies can also include a bushing that includes one or more slots (e.g., locking slots and/or detent slots) and is non-permanently attached to the base. The spring-loaded pivot pin can force the linking pin into the at least one bushing slot when the arm is in a deployed and/or folded (stowed) position.

Abstract: A trigger mechanism is provided with selectable pull characteristics. The trigger mechanism can include a mode selector element configured to select one of a plurality of disconnector elements designed to provide different pull characteristics. The trigger mechanism can include a trigger element including a trigger sear, a plurality of disconnector elements, a hammer element, and a mode selector. Each disconnector element can provide different pull characteristics. The hammer element is operable between a cocked position and a released position and includes a hammer sear configured to engage the trigger sear when the hammer element is in the cocked position. The mode selector element is adjustable between a plurality of positions to select between the different pull characteristics.

Abstract: The present teachings relate to an air feed device with at least one impeller, with at least one housing that at least partially surrounds the impeller, with at least one intake opening for inward suction of air into an operating space of the impeller, with at least one opening to blow out air from the operating space of impeller. Provision is made that the air feed device has at least one additional through-passage opening for air.

Abstract: A firearm impingement apparatus that is operable to divert a portion of the gas flowing into the gas block of the impingement apparatus so as to reduce the temperature and contamination thereof. The impingement apparatus includes a gas block integrally formed with a barrel-mating sleeve. The gas block includes a gas block port line that is in axial alignment with a gas vent tube located on a barrel of a firearm. The gas block further includes at least one exhaust port fluidly coupled with the gas block port line. Movably secured within the at least one exhaust port is an adjustment screw. The adjustment screw is movable intermediate a first position and a second position so as to facilitate diversion of gas from the gas block at varying volumes.

Abstract: A fan unit for a heat exchanger of a vehicle, has a plate-like support structure or shroud which has a main opening defining a passage for a flow of air for ventilation of the heat exchanger, and an electric fan arranged to cause the flow of air. The fan has a drive motor and an impeller connected to the motor. The support structure or shroud has a top side intended to extend at a small distance from a horizontal cross-member of the heat exchanger or the vehicle, so that an interspace is defined between them. This top side of the support structure or shroud has a flexible sealing gasket which has a configuration such that, in the assembled operating condition of the fan unit, the gasket is able to close off the interspace.

Abstract: A nacelle structure for a gas turbine engine includes a core engine nacelle disposed about an engine axis and an outer nacelle disposed about the core engine nacelle. A bifurcation extends between the outer nacelle and the core engine nacelle along a bifurcation axis extending between the outer nacelle and the core engine nacelle. The bifurcation includes at least one mounting surface that is disposed at a non-normal angle relative to the bifurcation axis.

Abstract: An impeller (2) for a centrifugal pump includes a first shroud having a plurality of blades (8). A second shroud is joined onto the first shroud by way of welding. Each blade (8) has an apex region (12), at which the blade contacts the second shroud. At least one of the blades (8) in a first section (20) of the apex region (12) has a weld connection to the second shroud, and in at least one second section (14) of the apex region (12) is free of a weld connection.

Abstract: An adapter for a QD socket is disclosed. The adapter has a connection post having a plurality of tabs movable relative to each other between a first configuration and a second configuration. The first configuration defines a maximum effective outer diameter of the connection post, and the second configuration defines a minimum effective outer diameter of the connection post. A method of modifying a quick disconnect attachment is also disclosed.

Abstract: A composite ammunition magazine comprises a box with a follower slidably disposed in the box and a spring disposed between a bottom of the box and the follower and biasing the follower towards an open top. A pair of opposite lips extends from proximal ends at opposite sides of the open top in an arc to distal free ends over the open top of the box. The box and the pair of lips comprise a composite material comprising fibers in a resin matrix with the sides of the box comprising hoop fibers oriented at 0 degrees and axial fibers oriented at 90 degrees, and the pair of lips comprising lateral fibers oriented at 0 degrees and arc fibers extending in an arc and oriented at 90 degrees with respect to the lateral fibers. The pair of lips comprises more arc fibers than the axial fibers in the box.

Abstract: A propeller system for an aircraft includes a propeller assembly rotatable about a central axis and a reduction gearbox operably connected to the propeller assembly via a propeller shaft. An electrical power transfer system is positioned such that the gearbox is located axially between the electrical power transfer system and the propeller assembly. The electrical power transfer system includes a slip ring assembly secured to an oil transfer tube extending to the propeller assembly and a brush block interactive with the slip ring assembly to transfer electrical power to a plurality of lead wires extending from the slip ring assembly to the propeller assembly. The brush block is positioned such that brush block tips of the brush block extend toward the slip ring assembly in a substantially radial direction relative to the central axis of the propeller assembly.

Abstract: A magazine for a firearm is formed by a plurality of sidewalls that define a space for holding ammunition cartridges. An opening between two of the walls provides access to the space. Feed lips are positioned on opposite sides of the opening. The feed lips contact and retain the cartridges within the space. Feed ramp surfaces are positioned on opposite sides of the opening. The feed ramp surfaces are angularly oriented to tilt a cartridge so that it may be fed into the chamber of a barrel as it is pushed out of the opening along the feed ramp surfaces. Guide surfaces are positioned on opposite sides of the opening between the feed lips and the feed ramp surfaces. The guide surfaces guide the cartridge as it disengages from the feed lips and moves up along the feed ramp surfaces.

Abstract: A system and method for a user's appendages when firing a weapon is described. One embodiment includes a cover kit for a firearm handguard. The kit has a base and an insert. The base has a longitudinal axis, an upright axis, a transverse axis, a socket, an exterior surface, and an interior surface. The insert has an insert body and a plug. The socket has a movable engagement prong shaped to engage a wall surface of a handguard slot. The plug has a prong engagement surface shaped to engage the engagement prong. The plug is shaped to apply a force on the engagement prong such that a distal portion of the engagement prong is flexed more than a proximal portion of the engagement prong.

Abstract: A metal annular casing (16) for a turbine engine compressor, the casing having at least one annular row of radial chimneys for receiving outer cylindrical pivots of variable-pitch vanes, together with an outer cylindrical centering track (28) that is continuous or interrupted and against which runners carried by an annular ring for controlling the pitch of the vanes are to come to bear, the casing being characterized in that the track is formed by blocks (30) of plastics material fitted onto the casing and that are fastened or held on the casing.

Abstract: An aerofoil component of a gas turbine engine is provided. The component has a longitudinally extending aerofoil portion which spans, in use, a working gas annulus of the engine. The aerofoil portion contains an internal chamber for a flow of coolant. The chamber includes a helical passage which spirals in a plurality of turns around an axis that extends in the length direction of the aerofoil portion.

Abstract: In a sealing device which seals between an outside space between an outer side in the radial direction of an external diffuser which has a tubular shape and forms an exhaust channel through which combustion gas rotating a rotor of a gas turbine passes in the inner side in the radial direction and an outside member which is disposed outside the external diffuser with an interval between them in the radial direction, and the exhaust channel by an end of the external diffuser, a first seal plate group and a second seal plate group in which a plurality of seal plates, which extend to the outer side in the radial direction from the end of the tubular external diffuser and reach the outside member, are laminated in contact with each other, and a spacer which maintains the first seal plate group and the second seal plate group with an interval in an axial direction in which a rotational axis of the rotor extends are provided.

Abstract: An axial fan has a hub whose axis coincides with the rotational axis of the fan, a plurality of vanes that extend from the hub, and an outer ring which is coaxial with the hub. The ring has a front portion and a rear portion. The outer ring defines within itself a passage towards the rear portion. The radially outermost ends of the vanes are connected to the inner surface of the passage. The rear portion of the ring has a plurality of appendages that extend axially away from the front portion of the ring, and which alternate circumferentially with corresponding intermediate recesses. Each vane has its radially outermost end connected to an inner surface of one of the appendages.

Abstract: A system and method for charging a weapon. In an illustrative embodiment, a charging assembly attaches to the side of an MK19 grenade launcher. The charging assembly includes a chain that attaches at one end to the charging bolt of the MK19 grenade launcher. The other end of the chain attaches to a crank assembly. The crank assembly includes a handle and a sprocket that rotate around a pivot axis, pulling on the chain and the charging bolt. The sprocket is large enough that the charging bolt is fully drawn by rotating the handle and the sprocket less than one full rotation around the pivot axis.