Abstract: A line of sight blocker including a cover defining a duct bounded by the cover and a heated surface when the cover is fastened over the heated surface. The cover blocks transmission of infrared radiation emitted from the heated surface; the cover comprises a material having a lower thermal conductivity than the heated surface; and the duct comprises a vent and a path for latent heat from the heated surface to escape through the vent.

Abstract: A line of sight blocker including a cover defining a duct bounded by the cover and a heated surface when the cover is fastened over the heated surface. The cover blocks transmission of infrared radiation emitted from the heated surface; the cover comprises a material having a lower thermal conductivity than the heated surface; and the duct comprises a vent and a path for latent heat from the heated surface to escape through the vent.

Abstract: An ejector including a mixing section; an inlet to the mixing section, the inlet comprising a first wall; a nozzle disposed in the inlet; the nozzle comprising the second wall defining a first channel through the nozzle, wherein the first wall and the second wall define a second channel through the inlet, the second wall has a trailing edge and a curved surface including a varying radius of curvature defining depressions extending to the trailing edge, a first flow of a first fluid into the second channel creates a pressure in the mixing section that draws a second flow of a second fluid through the first channel and into the mixing section, and the first flow and the second flow interact along the curved surface including the depressions and the trailing edge, forming a mixture comprising the first fluid and the second fluid. An outlet from the mixing section outputs the mixture, wherein the flow is well mixed and contains significant amounts of each fluid.

Abstract: Example doors for ducted fan inlet openings are disclosed herein. An example apparatus disclosed herein includes a door and a duct of a ducted fan unit extending through a body of an aircraft. The duct of the example apparatus defines a passageway between a first opening in a first side of the body and a second opening in a second side of the body opposite the first side. The example apparatus also includes an actuation system to move the door between a first position in which the door is disposed over the first opening and a second position in which the door is disposed over the first side of the body and outside of a diameter of the first opening. In the example apparatus, the door is orientated generally parallel to the first side of the body throughout movement of the door between the first position and the second position.

Abstract: Example doors for ducted fan inlet openings are disclosed herein. An example apparatus disclosed herein includes a door and a duct of a ducted fan unit extending through a body of an aircraft. The duct of the example apparatus defines a passageway between a first opening in a first side of the body and a second opening in a second side of the body opposite the first side. The example apparatus also includes an actuation system to move the door between a first position in which the door is disposed over the first opening and a second position in which the door is disposed over the first side of the body and outside of a diameter of the first opening. In the example apparatus, the door is orientated generally parallel to the first side of the body throughout movement of the door between the first position and the second position.

Abstract: Systems and methods for long range recognition and identification of objects and targets, and, more particularly, to long range imaging systems that include the use of mid-wave infrared laser illumination technology are provided. In particular, mid-wave infrared laser illuminated imaging systems and methods are disclosed for addressing, among other things, the problems associated with long range, day or night observations of targets through various obscurants (e.g., fog, haze, rain, smoke). Such systems may be configured to operate in either a single, active illumination mode or in a dual, active/passive mode.