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A barrier filter for use in an helicopter to remove contaminants from intake air prior to delivery to an engine. The helicopter has an intake and a peripheral external surface adjacent to the intake. The filter includes a pleated filter element mounted flush across the intake such as to meet the con

A barrier filter for use in an helicopter to remove contaminants from intake air prior to delivery to an engine. The helicopter has an intake and a peripheral external surface adjacent to the intake. The filter includes a pleated filter element mounted flush across the intake such as to meet the contour of the peripheral external surface. The filter element comprises a porous filter media and having a surface area such that a calculated speed of air flowing through the filter, when the engine is operating at take off power (TOP) or military intermediate rated power (IRP), is less than about 30 ft/sec. The filter may be retrofit into helicopters having other contaminant removal systems. Preferably, the filter is positioned such that intake air is delivered to the engine at a pressure which is substantially independent of whether the helicopter is moving in a forward direction or hovering with no forward motion.

대표청구항 ▼

A barrier filter for use in an helicopter to remove contaminants from intake air prior to delivery to an engine. The helicopter has an intake and a peripheral external surface adjacent to the intake. The filter includes a pleated filter element mounted flush across the intake such as to meet the con

A barrier filter for use in an helicopter to remove contaminants from intake air prior to delivery to an engine. The helicopter has an intake and a peripheral external surface adjacent to the intake. The filter includes a pleated filter element mounted flush across the intake such as to meet the contour of the peripheral external surface. The filter element comprises a porous filter media and having a surface area such that a calculated speed of air flowing through the filter, when the engine is operating at take off power (TOP) or military intermediate rated power (IRP), is less than about 30 ft/sec. The filter may be retrofit into helicopters having other contaminant removal systems. Preferably, the filter is positioned such that intake air is delivered to the engine at a pressure which is substantially independent of whether the helicopter is moving in a forward direction or hovering with no forward motion. lly aligned openings extending generally transversely of said floor section of said wire facing unit, and said openings being larger in area than said cross-section of said connecting rod, whereby said elements are adapted to be interconnected to form at least part of a geogrid-reinforced retaining wall by positioning the wire facing unit with the front face of the face section forming a portion of the face of the retaining wall and the floor section extending rearwardly therefrom, positioning the apertures in the forward end portions of the geogrid section over the protuberances in the wire elements at the rear end portions of the floor section of the wire facing unit with one of the cross-bars of the geogrid forwardly of said protuberances seated in the pocket formed by the wire elements and with portions of the geogrid section extending rearwardly from the wire facing unit, inserting the connecting rod through the openings formed by the protuberances to connect the geogrid section to the wire facing unit, and adding aggregate behind the rear face of the face section of the wire facing unit and on top of the upper face of the floor section of the wire facing unit and over the geogrid section. 2. A retaining wall system according to claim 1, wherein said wire facing unit is formed of metal and said face section and said floor section are formed by continuous, longitudinally extending wire elements interconnected by a plurality of spaced transversely extending cross-wires. 3. A retaining wall system according to claim 2, further including at least one strengthening strut for connecting a cross-wire in said upper end portion of said face section with a cross-wire in said rear end portion of said floor section of said wire facing unit. 4. A retaining wall system according to claim 2, wherein said protuberances are formed at the terminal end portions of the floor section of the wire facing unit, and a transversely extending cross-wire interconnects the said longitudinally extending wire elements at the rear end of the floor section. 5. A retaining wall system according to claim 1 wherein said at least one transversely extending cross-wire of said floor section is positioned rearwardly of said protuberances and extends below said longitudinally extending wire elements to underlie the portions of the geogrid section extending rearwardly from the facing unit. 6. A retaining wall system according to claim 1, wherein said geogrid section is a uniaxially stretched integral polymeric geogrid. 7. A retaining wall system according to claim 1, wherein said connecting rod is formed of a fiberglass reinforced polymeric material. 8. A retaining wall system according to claim 1, wherein said connecting rod is resilient to enable a leading end of the connecting rod to be inserted into the openings formed by the protuberances in the wire elements of the rear end portions of the floor section of the wire facing unit between a pair of wire elements forming the protuberances. 9. A retaining wall system according to claim 1, wherein said connecting rod has opposed end portions, and at least one of said end portions is non-flat to facilitate inserting the connecting rod through the openings formed by the protuberances in the wire elements of the rear end portions of the floor section of the wire facing unit. 10. A retaining wall comprising, in combination: a) at least one wire facing unit including a face section and a floor section extending from one side of said face section, said face section having upper and lower end portions and front and rear faces, and said floor section having front and rear end portions and upper and lower faces, at least the rear end portions of said floor section being formed of a plurality of spaced, generally parallel, longitudinally extending wire elements interconnected by at least one generally transversely extending cross-wire, b) at least one elongated geogrid section having forward end portions and rearwar