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Methods and apparatus for controlling aircraft inlet air flow. The apparatus can include an external flow surface having a forward portion, and an engine inlet positioned at least proximate to the external flow surface and aft of the forward portion. The engine inlet can have an aperture and can be

Methods and apparatus for controlling aircraft inlet air flow. The apparatus can include an external flow surface having a forward portion, and an engine inlet positioned at least proximate to the external flow surface and aft of the forward portion. The engine inlet can have an aperture and can be coupled with an engine inlet duct to an engine location. An auxiliary flow duct can be positioned at least proximate to the external flow surface and can include a first opening and a second opening spaced apart from the first opening. The first opening can be positioned to receive flow from the external flow surface during at least a first portion of an operating schedule of the propulsion system. The auxiliary flow duct can be configured to direct air to the engine location during at least a second portion of the operating schedule of the propulsion system. In one embodiment, boundary layer flow developed over the external flow surface can be diverted through the auxiliary flow duct, for example, during cruise operation, and auxiliary air flow can be provided to the engine through the auxiliary flow duct, for example, during takeoff operation.

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Methods and apparatus for controlling aircraft inlet air flow. The apparatus can include an external flow surface having a forward portion, and an engine inlet positioned at least proximate to the external flow surface and aft of the forward portion. The engine inlet can have an aperture and can be

Methods and apparatus for controlling aircraft inlet air flow. The apparatus can include an external flow surface having a forward portion, and an engine inlet positioned at least proximate to the external flow surface and aft of the forward portion. The engine inlet can have an aperture and can be coupled with an engine inlet duct to an engine location. An auxiliary flow duct can be positioned at least proximate to the external flow surface and can include a first opening and a second opening spaced apart from the first opening. The first opening can be positioned to receive flow from the external flow surface during at least a first portion of an operating schedule of the propulsion system. The auxiliary flow duct can be configured to direct air to the engine location during at least a second portion of the operating schedule of the propulsion system. In one embodiment, boundary layer flow developed over the external flow surface can be diverted through the auxiliary flow duct, for example, during cruise operation, and auxiliary air flow can be provided to the engine through the auxiliary flow duct, for example, during takeoff operation. unication to a host remote from the light sources. 2. The arrangement of claim 1, wherein the light source is a semiconductor laser. 3. The arrangement of claim 1, wherein the pattern generator includes a mirrored element having a plurality of inner mirrors, a drive for rotating the element about an axis of rotation, and a plurality of outer mirrors arranged about the axis and spaced radially from the inner mirrors. 4. The arrangement of claim 3, wherein the inner mirrors are equidistantly arranged around the axis, and wherein the outer mirrors are equidistantly arranged around the axis. 5. The arrangement of claim 3, wherein the inner mirrors of the mirrored element are successively impinged by the light beam during rotation; and wherein one of the inner mirrors has a leading edge and a trailing edge as considered along the direction of rotation; and wherein the controller is operative for energizing the light source as the light beam impinges the leading edge, and for de-energizing the light source as the light beam impinges the trailing edge of said one mirror during rotation in the second mode of operation. 6. The arrangement of claim 5; and further comprising an edge detector for detecting the leading edge of said one mirror during rotation in the second mode of operation. 7. The arrangement of claim 6, wherein the edge detector includes a light-absorbing marker situated on the leading edge of said one mirror. 8. The arrangement of claim 6, wherein the edge detector includes a light-reflective marker situated on the element. 9. The arrangement of claim 6, wherein the drive includes a motor having a drive shaft, and wherein the edge detector includes a spline on the shaft and keyed in a predetermined position to the element. 10. The arrangement claim 6, wherein the edge detector includes a permanent magnet on the element for joint rotation therewith, and a Hall effect sensor adjacent the magnet and operative for generating an output control signal corresponding to the location of the leading edge as the magnet moves past the sensor. 11. The arrangement of claim 1; and further comprising a housing in which the light source and the pattern generator are mounted; and further comprising a mode selector for selecting the mode of operation. 12. The arrangement of claim 11, wherein the pattern generator automatically operates in the first mode, and wherein the mode selector includes a manually depressable trigger on the housing and operative, when depressed, to actuate the controller to convert the pattern generator to operate in the second mode. 13. The arrangement of claim 11, wherein the mode selector includes a two-position, manually depressable trigger on the housing and operative, when depressed to a first position, to actuate the pattern generator to operate in the first mode, and further operative, when depressed to a second position, to actuate the pattern generator to operate in the second mode. 14. The arrangement of claim 11, wherein the housing has a handle for hand-held use, and wherein the mode selector actuates the pattern generator to operate in the first mode when the housing is not hand-held, and includes a manually depressable trigger on the housing and operative, when hand-held and depressed, to actuate the controller to convert the pattern generator to operate in the second mode. 15. An arrangement for electro-optically reading bar code symbols, comprising: a) a housing having a handle for hand-held use; b) an energizable laser in the housing for emitting a laser beam when energized; c) a pattern generator in the housing, for moving the laser beam in an omni-directional scan pattern comprised of a plurality of intersecting sets of a plurality of scan lines across a symbol during a scan period in a first mode of operation; d) a controller in the housing for converting the plurality of scan lines to a single scan line by intermittently operating and energizing the laser to emit the laser beam for a wor king time period which is less than, and a fraction of, the scan period to cause the pattern generator to generate the single scan line across the symbol in a second mode of operation; e) a mode selector for enabling a user to change the mode of operation of the pattern generator; f) a detector for detecting laser light reflected from the symbol during one of the modes, and for generating an electrical signal indicative of the symbol; and g) a transmitter for transmitting the electrical signal by wireless communication to a host remote from the housing. 16. The arrangement of claim 15, wherein the selector includes a manually depressable switch on the housing and operative, when depressed, to convert the operation from the first mode to the second mode. 17. A method of electro-optically reading indicia, comprising the steps of: a) emitting a light beam from a light source; b) moving the light beam in a multiple line, scan pattern across an indicium during a scan period in a first mode of operation; c) converting the multiple line, scan pattern to a single scan line by intermittently operating and energizing the light source to emit the light beam for a working time period which is less than, and a fraction of, the scan period to generate a single scan line across the indicium in a second mode of operation; d) detecting light reflected from the indicium during one of the modes, and generating an electrical signal indicative of the indicium; and e) transmitting the electrical signal by wireless communication to a host remote from the light source. 18. The method of claim 17, wherein the moving step is performed by rotating a succession of inner mirrors past the light beam about an axis of rotation, one of the inner mirrors having a leading edge and a trailing edge as considered along the direction of rotation; and wherein the intermittently energizing step is performed by energizing the light source as the light beam impinges and passes by the leading edge, and by de-energizing the light source as the light beam impinges and passes by the trailing edge of said one mirror during rotation in the second mode of operation. 19. The method of claim 18; and further comprising the step of detecting the leading edge of said one mirror during rotation in the second mode of operation. 20. The method of claim 17; and further comprising the step of selecting the mode of operation.