Abstract: According to the present disclosure there is provided an arrangement for influencing liquid flow, the arrangement comprising: a first section selectively configurable to provide a vortex generator surface to induce vortices in the liquid flow. The arrangement further comprises a second section, wherein the first section and second section are movable relative to one another to provide the vortex generator surface.

Abstract: In some examples, a biasing structure for a unit cell of a meta-surface comprises a first illumination source to irradiate a first photovoltaic element, the first photovoltaic element so configured as to generate a biasing current to bias an active asymmetrically conducting device bridging a pair of electrically separated conductive patches defining a surface of the unit cell.

Abstract: An airframe 1 or part thereof comprises a set of modular cells 10, including a first cell 10A comprising a set of profiles 100 including: a first structural profile 100A, having a first length L1 and enclosing a first volume V1 providing a first passageway P1; and a second profile 100B, having a second length L2 and enclosing a second volume V2, wherein the first passageway P1 is arranged to receive the second profile 100B therein.

Abstract: A control system for electronically linked pilot and co-pilot inceptors (103) permits an asymmetric roll axis feel depending on whether an inceptor is moved inboard or outboard. A circuit (401) receives a signal representative of a force applied to the pilot's inceptor resulting from a side-to-side movement and detects if the force applied is in an inward or an outward direction. A gain factor is applied to the received force signal to produce a factored force signal. The gain applied to a signal representative of force applied in an outward direction is greater than the gain factor applied to a signal representative of force applied in an inward direction. A summer (212, 213) sums the factored force signal with a corresponding factored force signal derived from force signals from the co-pilot's inceptor to produce a modified force signal for use in a force feedback control system associated with each inceptor.

Abstract: According to the present disclosure there is provided an arrangement for influencing fluid flow, the arrangement comprising: a first section selectively configurable to provide a vortex generator surface, the vortex generator surface comprising a series of laterally aligned projections, to induce vortices in the liquid flow.

Abstract: In some examples, a non-incendiary tracer projectile structure for housing an electrically powered illumination source comprises a jacket comprising a generally pointed forward end and a generally blunt rearward end defining a rear opening, an internal retaining structure disposed towards the rearward end of the jacket to support a protective window that is transparent to a selected electromagnetic wavelength, wherein a portion of the rearward end of the jacket tapers in a radially inward direction whereby to define a circumferential narrowing of the rear opening so configured as to mechanically protect the internal retaining structure.

Abstract: A method of estimating a property of an article manufactured, at least in part, by additive manufacturing, AM, preferably directed energy deposition, DED, and/or powder bed fusion, PBF, is described. The method implemented, at least in part, by a computer comprising a processor and a memory. The method comprises: obtaining a set of in-process parameters of the AM of the article, wherein respective parameters of the set thereof have positional information associated therewith; inferring a set of attributes of the article corresponding to the set of in-process parameters, wherein respective attributes of the set thereof have the positional information associated therewith; and estimating the property of the article based, at least in part, on the inferred set of attributes.

Abstract: There is provided an ammunition belt link comprising, a sprung wire, said sprung wire arranged to form a first receiving portion suitable for retaining a first ammunition cartridge, a second receiving portion suitable for retaining a second ammunition cartridge, a spacer between said first receiving and second receiving portions; and an ammunition cartridge locator aide, said aide locates in an ejector groove of a received cartridge.

Abstract: A method of producing at least part of a structural frame of a vehicle, the method comprising: providing a support structure (300), the support structure (300) comprising: a plurality of elongate members (301); and one or more retaining members (208) configured to retain the elongate members (301); mounting a plurality of first structural components (206) to the support structure (300) by coupling the first structural components (206) to the elongate members (301) such that each first structural component (206) occupies a different respective position along the elongate members (301); and attaching a plurality of second structural components (204) to the first structural components (206), thereby coupling together the first structural components (206) to form the at least part of the structural frame of a vehicle.

Abstract: According to the present invention, there is provided an ammunition belt link comprising, a sprung wire, said sprung wire arranged to form a first receiving portion suitable for retaining a first ammunition cartridge, a second receiving portion suitable for retaining a second ammunition cartridge, a spacer between said first receiving and second receiving portions, an ammunition cartridge locator aide, said locator aid locates in an ejector groove of a received cartridge and, the wire ammunition belt link further comprising a support surface suitable for retaining the first and/or second ammunition cartridge.

Abstract: A method of manufacturing a pressure vessel (10) comprising the steps of dividing a wall (104) of a section (100) of the pressure vessel (10) into a first segment (120) and a second segment (150), separating the first segment (120) from the second segment (150), fitting apparatus (400) onto the first segment (120), and then re-attaching the first segment (120) and the second segment (150).

Abstract: A workbench system comprising: a workbench; a multi-axis robot; a visible light projector; and a controller; wherein the workbench and the robot are located in a common workspace; the controller is configured to: determine a movement operation for the robot; and, using the determined movement operation, control the visible light projector to project a visible light indication onto at least one of a surface of the workbench and a surface of the workspace; the visible light indication indicates a limited area of the workbench and/or workspace, the limited area corresponding to a limited volume of space; and the movement operation is such that, if the robot performs the movement operation, the robot moves entirely within only the limited volume of space.

Abstract: An alignment jig (10) configured to support and orient a load (500). The alignment jig (10) may form part of an alignment system (300). The alignment jig (10) comprises a first base unit (100) configured to carry a first support unit (200), the first support unit (200) being configured to support the load (500) and to space the first base unit (100) apart from the load (500). The first support unit (200) is moveable relative to the first base unit (100). The first base unit (100) comprises a first base unit actuation system (110) operable to act on the first support unit (200) along a first base unit operational axis X1. The first support unit (200) comprises a first support unit actuation system (210) operable to act on the load (500) along a first support unit operational axis Y1.

Abstract: An unmanned vehicle (20) for relaying radio frequency signals in a tactical communications network is described. The unmanned vehicle comprises a processor (22) arranged to receive the location of a first asset (40a); select a relay site (30) from at least one relay site; and control the unmanned vehicle to move to the selected relay site, wherein at the selected relay site, communication between the first asset and the unmanned vehicle is enabled. The unmanned vehicle also comprises a receiver for receiving data from the first asset; and a transmitter for transmitting the data to a second asset (40b, 20, 10). A control unit (60) for an unmanned vehicle, a tactical communications network comprising a plurality of unmanned vehicles, and a method of relaying signals in a tactical communications network using an unmanned vehicle are all also described.

Abstract: A corrosion sensor is described. The corrosion sensor comprises a substrate 10 and a patterned conductive layer provided on the substrate 10, wherein the conductive layer defines: a common terminal; a set of terminals, including a first terminal and a second terminal; and a set of sensing elements, including a first sensing element and a second sensing element; wherein respective sensing elements of the set thereof are electrically coupled to the common terminal and to respective terminals of the set thereof, such that the respective terminals of the set thereof are specific to the respective sensing elements of the set thereof.

Abstract: A wheel arm (114) for a chassis (140) of a towed howitzer system (100). The wheel arm (114) comprises a chassis coupling feature (116) centred on a wheel arm pivoting axis (160), and a wheel coupling feature (118) centred on a wheel rotation axis (162). The chassis coupling feature (116) is spaced apart from the wheel coupling feature (118). The wheel arm (114) comprises a lever engagement feature (122). The lever engagement feature (122), the wheel coupling feature (118) and the chassis coupling feature (116) are provided in series along the length of the wheel arm (114).

Abstract: There is provided a projectile, a system and a related method of operation of a projectile comprising: a front ogive section; an aft section; and a control module; wherein the front ogive section is rotatably connected to the aft section by a coupling device, the front ogive section further comprising an asymmetric surface such that the asymmetric surface exerts an imbalance upon the projectile, where in use, the angular rotation of the front ogive section can be selectively adjusted relative to the aft section by commands from the control module to the coupling device influencing a helical trajectory of the projectile in flight thereby causing a change in direction thereby steering the projectile towards a target.

Abstract: The present invention relates to an improved thermal management system for a heat source, such as a high-powered electronic device. Thermal management systems work to maintain the optimal operational temperature of a device to maximise reliability, operational lifespan and/or efficiency, for example by using a fluid coolant to transfer thermal energy from the device to a heat exchanger. The present invention seeks to provide an improved thermal management system by incorporating a phase change material into a heat exchanger.

Abstract: There is described a reconfigurable array for facilitating dynamic combination and distribution of RF signals.

Abstract: A optical apparatus to display an image to a user is disclosed. The apparatus comprises an image source to generate an image bearing light beam having a first numerical aperture; and a diffuser screen. The diffuser screen is configured to increase the numerical aperture of the image bearing light beam to a second numerical aperture. The diffuser screen comprises a first part comprising: a first face and second face substantially parallel to each other, a first array of a plurality of waveguides forming an optical path between the first face and the second face. A value of an optical property of each of the plurality of waveguides is selected randomly from a set of values of the optical property. The first array of a plurality of waveguides is arranged such that each of the plurality of waveguides has an optical axis that is substantially parallel to it's nearest neighbour.