Abstract: A rotor blade including a main portion having a main portion leading edge shield; a main portion impact-resistant layer formed on a nose of the leading edge shield; a main portion erosion-resistant layer formed on a top and bottom of the main portion, rearward of the main portion impact-resistant layer; a main portion foil formed on the top and the bottom of the main portion rearward of the main portion erosion-resistant layer; a tip cap having a tip cap leading edge shield; a tip cap impact-resistant layer formed on a surface of the tip cap leading edge shield; and a tip cap foil formed on the top and the bottom of the tip cap rearward of the tip cap erosion-resistant layer.

Abstract: A rotor blade including a main portion having a main portion leading edge shield; a main portion impact-resistant layer formed on a nose of the leading edge shield; a main portion erosion-resistant layer formed on a top and bottom of the main portion, rearward of the main portion impact-resistant layer; a main portion foil formed on the top and the bottom of the main portion rearward of the main portion erosion-resistant layer; a tip cap having a tip cap leading edge shield; a tip cap impact-resistant layer formed on a surface of the tip cap leading edge shield; and a tip cap foil formed on the top and the bottom of the tip cap rearward of the tip cap erosion-resistant layer.

Abstract: This invention is the use of multiple, similar, air bubble curtains that are used in parallel patterns to move or guide fish in a body of water by moving the pattern. As the pattern moves, the fish follow for various reasons, such as attraction, behavior interaction such as play or hiding, and optokinetic navigation on the moving but, apparently to the fish, static air curtain. The moving patterns are repetitive so that if one pattern does not sufficiently motivate a particular fish, it might be influenced by the next. The repetitive, moving patterns continue indefinitely, statistically sweeping the fish in a particular direction. This invention uses a very low rate of fish response to produce a steady sweeping of fish in a particular direction or to a particular point.

Abstract: An electronics assembly for example a computer, comprises a chassis (1) having a recess therein for housing a plurality of cooling fans (30) that are arranged in series and can be removed from the recess by sliding out of the recess in a direction across the direction of intended airflow. The assembly is such that any of the fans (30) can be removed and replaced without interrupting operation of the or any other fan, and the recess and/or the fans have a seal (40, 54) to prevent or reduce bypass leakage of air around the fans.

Abstract: A sound-suppressing panel for use on the surface of a structure adjacent which a fluid is to flow. The panel includes a top sheet (which may be conveniently referred to as a cover) and a bottom sheet, and plurality of walls which are generally perpendicular to the two boundary sheets; the walls have various orientations and intersect one another at various locations so as to form cells which are similar to well-known "honeycomb" cells. Unlike true honeycomb formed by bees, the cells of an optimum construction according to this invention are not uniform. Ideally, there are at least three different cell sizes, and the cells are intermixed (side by side) so that the fluid passing adjacent the cover will sequentially encounter cells of differing sizes. Throughout the cover are provided a plurality of linear passages which permit the fluid which is flowing above the cover to communicate with the plurality of cells below the cover.