Abstract: A method of manufacturing a double degree acoustic attenuation sandwich panel having a plurality of stacked components adhered together to form a unitary sandwich structure. The structure comprising an impervious facing of thin sheet material, a first honeycomb core with end wise directed cells, a first perforate facing of thin sheet material, a first thin layer of porous fibrous material, a second perforated facing of thin sheet material, a second honeycomb core with end wise directed cells, a third perforate facing of thin sheet material, the second perforated facing sheet having substantially larger perforations than the first and third sheets, and a second layer of porous fibrous material. The resulting sandwich panel has a pre-determined flow through resistance between the outer surface of the first and second layers of porous fibrous material and the cells of the first and second honeycomb cores.

Abstract: A thrust reverser for the gas stream of a turbofan jet aircraft engine. The engine having a surrounding cowl section which forms a duct therebetween for engine gases. The surrounding cowl is divided into two sections, a forward fixed in position section and an aft translatable section. The thrust reverser operating mechanism comprises a plurality of reverser or blocker doors rotatable in and out of the duct. The operation mechanism of each of the reverser blocker doors comprises a pinion gear rotatable about a central axis which engages a pair of opposing gear racks, one gear rack attached to the forward fixed in position cowl section and the other attached and translated with the aft translated cowl section and link members interconnecting the pinion gear, where they have an off center pivotal attachment, and the reverser or blocker doors where they have a like pivotal attachment.

Abstract: Honeycomb noise attenuation sandwich panels and method of construction having a cellular core positioned between and bonded to two facing sheets. One facing sheet is perforated and the other imperforate. A thin sheet of porous fibrous felt or fabric is bonded to the perforated sheet. The core cells communicate with the atmosphere through the perforated sheet and the pores of the fibrous sheet.

Abstract: Honeycomb noise attenuation sandwich panels and method of construction having a cellular core positioned between and bonded to two facing sheets. One facing sheet is perforated and the other imperforate. A thin sheet of porous fibrous felt or fabric is bonded to the perforated sheet. The core cells communicate with the atmosphere through the perforated sheet and the pores of the fibrous sheet.

Abstract: A thrust reverser for the gas stream of a fan jet engine. The engine having a surrounding cowl which forms a fan duct therewith that is divided into a forward fixed and an aft translatable section. The thrust reverser mechanism comprises the plurality of blocker doors rotatable in and out of the fan duct. The rotation mechanism of each of the blocker doors comprises a pinion gear rotatable about a central axle which engages the teeth of a pair of opposing gear racks, one gear rack is attached to the forward cowl section and the other is attached to and carried by the aft cowl section and at least one link member pivotably connected at one end to the axle and at the other end to one of the blocker doors. The translation of the aft cowl section causes said blocker doors to rotate in and out of the fan duct and expose and cover gas reversing cascades.

Abstract: A metal working machine for moving a cutting tool through a metal workpiece which includes a spindle carrying a cutting tool therein, a feed drive motor for advancing the spindle, and a rotation drive motor for rotating the spindle. The workpiece is firmly held by a variable force clamp in an operative position to permit the cutting tool to move therethrough. The thrust of the cutting tool is sensed as well as the rotational velocity of the spindle. A data memory contains the optimum thrust load against a predetermined workpiece material for a cutting tool having a predetermined diameter dimension.

Abstract: A thrust reverser for a fan jet engine. The engine has a primary nozzle for the rearward passage of primary gases and a fan associated therewith. An aerodynamically streamlined cowl surrounds the fan and is spaced from the primary nozzle. Space therebetween forming a fan nozzle for the passage of fan gases. The cowl has a fixed forward section and a translatable aft portion. Stowed the aft section abuts the forward section and forms a continuous inner and outer flow surface and when translated rearward to a deployed position an opening is formed between the sections. A pair of blocker doors are each rotatably connected to the forward cowl section through a pair of longitudinally translatable pivots. The pivots are normally biased in a forward position by a biasing spring. Links are pivotably attached between the blocker doors and the aft cowl section.

Abstract: A thermal barrier material comprising at least four vertically stacked cellular cores separated with septum sheets and enclosed at the outer periphery by facing sheets. The components making up the thermal barrier material may be constructed of titanium alloy, TD nickel, niobium, or the like. In one embodiment, one outer facing sheet is highly polished for use as a reflective surface.

Abstract: An adjustable, flush mounted over center hook-latch assembly of the general type employed to secure abutting aircraft panels in flight ready condition. The device, the tension on the internal hook and eye structure, is adjustable from the external surface of the aircraft skin. Precision alignment pins and apertures cooperating therewith provide for proper alignment of the two abutting panel structures prior to their latched flight ready condition.

Abstract: The manufacturing of multi-layer bi-metallic thermo-barrier material utilizing combined brazing and difussion bonding methods of joining together the components of the barrier material.

Abstract: A double degree acoustic attenuation sandwich panel having a plurality of stacked components adhered together to form a unitary sandwich structure. The structure comprising an impervious facing of thin sheet material, a first honeycomb core with end wise directed cells, a first perforate facing of thin sheet material, a first thin layer of porous fibrous material, a second honeycomb core with end wise directed cells, a second perforate facing of thin sheet material and a second layer of porous fibrous material. The resulting sandwich panel has a predetermined flow through resistance between the outer surface of the first and second layers of porous fibrous material and the cells of the first and second honeycomb cores. The cell of the first and second honeycomb cores may be of equal or different volume cells and may be constructed of similar or dissimilar materials.

Abstract: A sandwich type acoustical absorbing panel for use adjacent high speed gas flow areas in and around the engines of high speed aircraft. The panel comprises a pan type base having an imperforate base member and upstanding sides and end walls, an acoustic absorbing medium is disposed within the pan type base, a rigid perforated plate is secured to the distal surfaces of the upstanding sides and end walls for enclosing the acoustic absorbing medium and a sheet of fine woven mesh is secured to the outer surface of the rigid perforated plate. The outer positioned fine woven mesh enhances acoustic properties of the panel and substantially prevents entry of water, dust, chemicals and similar foreign matter from penetrating into the panel structure and reduces the aerodynamic drag loss normally encountered by high speed gas flows across perforated material, such as, that normally used for the outer surface of acoustic panels.

Abstract: An improved deployment mechanism for deploying blocker doors between a stowed and a deployed position. At least a pair of operable blocker doors are utilized. These doors are pivotally attached to fixed cowl structure surrounding a turbo fan engine. A yoke member having adjacent curvilinear tracks is carried by a rear translatable cowl section. Sliders are provided that follow the adjacent tracks. A drag link is connected between a slider and fixed aircraft structure and a door deploying link is connected between each blocker door and is associated slider. In a second configuration, more than one blocker door is actuated by a link connected to a single slider, coupled by more than one door deploying link. When the translatable cowl section is translated rearward by conventional actuation, a peripheral outflow passage is formed between the cowl sections and the blocker doors now being deployed redirect the fan air through the peripheral opening.

Abstract: Method of making attenuation sandwich panels having a cellular core positioned between and bonded to an imperforate facing sheet on one surface thereof and a perforate sheet with an outer layer of porous fabric material adhered to the other surface. The combined perforate facing sheet and porous fibrous material have a predetermined open surface area prior to its adherence to the cellular core. A coating of adhesive is applied to either the facing sheets or to the faying surface of the cellular core. The sheets are then properly positioned with respect to the cellular core. The porous fabric surface of the combined perforate sheet and porous fibrous material is positioned against a perforated plate. The opposite surface of the perforated plate is positioned against a bonding tool that has a plurality of longitudinal grooves on its perforated plate adjacent surface.

Abstract: A double degree acoustic attenuation sandwich panel having a plurality of stacked components adhered together to form a unitary sandwich structure. The structure comprising an impervious facing of thin sheet material, a first honeycomb core with end wise directed cells, a first perforate facing of thin sheet material, a first thin layer of porous fibrous material, a second perforated facing of thin sheet material, a second honeycomb core with end wise directed cells, a third perforate facing of thin sheet material, the second perforated facing sheet having substantially larger perforations than the first and third sheets, and a second layer of porous fibrous material. The resulting sandwich panel has a pre-determined flow through resistance between the outer surface of the first and second layers of porous fibrous material and the cells of the first and second honeycomb cores.

Abstract: A turbo fan engine has a fan gas duct surrounding the exhaust or primary gas stream. The primary gas stream leaves the engine through a plurality of nozzles terminating within the fan gas stream. The nozzles are positioned so that mixing of the two gas streams is accomplished and, when utilized with a pair of clam shells for thrust reversing, cool air from the fan stream cools the inner surface of the clam shells and insulates the inner surface from the hot primary gas stream. The mixing of the streams is accomplished substantially within the fan gas duct.

Abstract: Method of making attenuation sandwich panels having a cellular core positioned between and bonded to an imperforate facing sheet on one surface thereof and a perforate sheet with an outer layer of porous fabric material adhered to the other surface. The combined perforate facing sheet and porous fibrous material have a predetermined open surface area prior to its adherence to the cellular core. A coating of adhesive is applied to either the facing sheets or to the facing surface of the cellular core. The sheets are then properly positioned with respect to the cellular core. The porous fabric surface of the combined perforate sheet and porous fibrous material is positioned against a perforated plate. The opposite surface of the perforated plate is positioned against a bonding tool that has a plurality of longitudinal grooves on its perforated plate adjacent surface.

Abstract: Method of fabricating attenuation sandwich panels having a central cellular core positioned between and bonded to an imperforate facing sheet on one surface thereof and a perforate facing sheet with an outer layer of porous fibrous material adhered to the other surface. The combined perforate sheet and porous fibrous material have a predetermined open surface area prior to attenuation panel fabrication. The porous fibrous surface is then saturated with a combined liquidous anti-wetting and indicator solution which coats substantially all of the fibers. The solution is allowed to dry and the opposite side is inspected for any indicator present. If indicator is detected on the opposite side of the perforate sheet from the porous fibrous material, it is removed therefrom. The components making up the panel are then assembled and bonded together to form the attenuation panel.

Abstract: An anti-broaching sidehull fence for a surface effect ship. The surface effect ship includes a central pressurized plenum chamber which is defined by the upper wet deck, forward and stern seals and sidehull fences positioned along the longitudinal sides of the surface effect ship. These sidehulls are configured to provide a seal preventing pressurized gas from escaping from the plenum chamber with minimum water emersion therealong while the surface effect ship is traveling at maximum forward speed.

Abstract: A method of manufacturing an improved adhesive bonded acoustical attenuation structure comprising two honeycomb cores each having a multiplicity of endwise directed cells, an imperforate sheet, two perforate sheets and two sheets of porous fibrous material. The components making up the attenuation structure in order from the bottommost layer upward are the imperforate sheet, the lower core, a perforate sheet, a sheet of porous fibrous material, the second core, the second perforated sheet with the uppermost layer being the second sheet of porous fibrous material.