Abstract: A buffer air cooler system for gas turbine engines disposed in a bypass duct of the engine, includes a housing for containing the buffer air cooler therein and an inlet portion attached to the housing. In one embodiment, the inlet portion has a double-skin configuration in at least one region of a top, bottom and sides of the inlet portion.

Abstract: A buffer air cooler system for gas turbine engines disposed in a bypass duct of the engine, includes a housing for containing the buffer air cooler therein and an inlet portion attached to the housing. In one embodiment, the inlet portion has a double-skin configuration in at least one region of a top, bottom and sides of the inlet portion.

Abstract: A buffer air cooler system for gas turbine engines disposed in a bypass duct of the engine, includes a housing for containing the buffer air cooler therein and an inlet portion attached to the housing. In one embodiment, the inlet portion has a double-skin configuration in at least one region of a top, bottom and sides of the inlet portion.

Abstract: A buffer air cooler system for gas turbine engines disposed in a bypass duct of the engine, includes a housing for containing the buffer air cooler therein and an inlet portion attached to the housing. In one embodiment, the inlet portion has a double-skin configuration in at least one region of a top, bottom and sides of the inlet portion.

Abstract: The exhaust ejector nozzle has a tubular wall defining an exhaust flow passage leading to an outlet plane, and a de-swirl cascade including a plurality of circumferentially interspaced fins each having a first end connected to the wall adjacent the outlet plane and a second end extending into the exhaust flow passage. The de-swirl cascade can maintain the pumping action of the ejector in high swirl exhaust conditions.

Abstract: A cooling apparatus for cooling a fluid in a bypass gas turbine engine comprises a heat exchanger disposed within a bypass duct and accommodated by a sub-passage defined by a flow divider affixed to an annular wall of the bypass duct. The sub-passage defines an open upstream end and an open downstream end to direct a portion of the bypass air flow to pass therethrough.

Abstract: A cooling apparatus for cooling a fluid in a bypass gas turbine engine comprises a heat exchanger disposed within a bypass duct and accommodated by a sub-passage defined by a flow divider affixed to an annular wall of the bypass duct. The sub-passage defines an open upstream end and an open downstream end to direct a portion of the bypass air flow to pass therethrough.

Abstract: A device suitable for efficiently controlling movement of a large mass where frequent acceleration and deceleration occur and precise positioning is desired is provided. A plurality of servomotors with drive gears are engaged with a main gear. A master feedback signal based on the speed and position of the servomotors is received by a controller capable of sending individual control signals to each of the plurality of servomotors so as to adjust the speed and positioning of the large mass.

Abstract: The present invention includes a gas turbine engine exhaust centerbody comprising a forward portion having at least one flap at a downstream end thereof to induce a local low pressure zone in the exhaust gas flow without significantly impeding it, a tailcone partially inserted into the forward portion so that at least part of the at least one flap overlaps a portion of the tailcone, a centerbody cavity containing gas at a pressure higher than the local low pressure, and at least one opening between the forward portion and the tailcone adjacent to and upstream of one of the local low pressure zones and providing fluid communication between the cavity and the exhaust gas flow. A ventilation flow out of the centerbody cavity through each opening is induced by a positive difference between the pressure of the gas in the centerbody cavity and the low pressure of the adjacent zone.

Abstract: The present invention provides an improved gripper for a folding cylinder of a folding machine. Each gripper is independently actuated and includes a gripper member and cam follower arm having their own springs to provide a gripping force and to allow it to operate separately from other gripper members on the same folding cylinder. The force to open the gripper prior to the material to be folded being tucked into the folding cylinder opening is generated by the involute profile on the cam arm which pushes against the involute profile on each gripper member. Independently actuated grippers provide the advantage that the folding operation is not susceptible to material thickness variations and it is possible to fold materials with a different thickness on different lanes of a web folding machine.

Abstract: The present invention includes a gas turbine engine exhaust centerbody comprising a forward portion having at least one flap at a downstream end thereof to induce a local low pressure zone in the exhaust gas flow without significantly impeding it, a tailcone partially inserted into the forward portion so that at least part of the at least one flap overlaps a portion of the tailcone, a centerbody cavity containing gas at a pressure higher than the local low pressure, and at least one opening between the forward portion and the tailcone adjacent to and upstream of one of the local low pressure zones and providing fluid communication between the cavity and the exhaust gas flow. A ventilation flow out of the centerbody cavity through each opening is induced by a positive difference between the pressure of the gas in the centerbody cavity and the low pressure of the adjacent zone.

Abstract: A fluid flow actuated valve for controlling the fluid flow in a conduit comprises a support structure adapted to be mounted within the conduit and at least one flap member pivotally mounted to the support structure. The at least one flap member is pivotable between an first position for a minimum fluid flow and a second position for a maximum fluid flow. A torsion spring is attached to the at least one flap member to urge the same to pivot against a fluid pressure differential, from the first position to the second position when the fluid pressure differential is smaller than a predetermined level.

Abstract: A roll of folded sheet material where the sheet of material includes at least one longitudinal fold line and at least one fold made about the longitudinal fold line. The roll is created by feeding the sheet of material through a folding board and then winding the same onto an accumulator roll. The rolls are adapted to be transferred to dispensers adapted to feed the sheets of material dispensed therefrom through an interfolder for creating an interfolded web of sheet material.

Abstract: A main engine mounted auxiliary power unit comprises an auxiliary power unit integrated with a primary gas turbine engine into a single power plant suited for aircraft applications. The auxiliary power unit can be mounted within an engine core compartment of the main engine or at the main engine aft center body. The integration of the auxiliary power unit provides for installation and certification cost savings to the airframer by eliminating the need for mounting an auxiliary power unit to the tail section of the aircraft.

Abstract: A main engine mounted auxiliary power unit comprises an auxiliary power unit integrated with a primary gas turbine engine into a single power plant suited for aircraft applications. The auxiliary power unit can be mounted within an engine core compartment of the main engine or at the main engine aft center body. The integration of the auxiliary power unit provides for installation and certification cost savings to the airframer by eliminating the need for mounting an auxiliary power unit to the tail section of the aircraft.

Abstract: A structural system comprising a plurality of tie elements (3) defining the base perimeter of a house, load-bearing metal columns (5) mounted thereon, and a continuous inwardly-open recess extending along the full length of the elements and receiving horizontal reinforcements (18, 19) that form an unbroken chain around the edges of the base. Anchoring reinforcements (12) extend away from the foundation and curve through the elements and along said recess, and hooks (15) are hung from an inwardly projecting portion (14) in such a way that the curved ends of the hooks are located in said recess. The hooks, the horizontal reinforcements and the anchoring reinforcements are all intended to be embedded in concrete cast in the recess. The system is particularly useful for building earthquake-proof single-family dwellings.