Abstract: An aircraft includes external structures, and one or more thermal emitters integrated with one or more of the external structures. The one or more thermal emitters are configured to generate heat to deice the one or more external structures. The one or more thermal emitters are configured to receive electrical power from one or more of an auxiliary power unit of the aircraft, a power distribution system of the aircraft, one or more engines of the aircraft, or an external power cart that is separate and distinct from the aircraft.

Abstract: A canopy attachment yoke, comprising: first and second support bars, each having a first end and a second end, wherein the respective first ends are configured for attachment to at least one support line of a canopy and the respective second ends are configured for attachment to a vehicle; and at least one spreader bar having a first end and a second end, the first end of the spreader bar connected to the first support bar and the second end of the spreader bar connected to the second support bar, wherein the spreader bar is slidably mounted on the first and second support bars.

Abstract: A wing mounting, comprising: ?a base (11); ?a wing bracket (25) pivotally mounted to the base, configured to rotate relative to the base within an operational angular range; and ?at least one biasing element configured to bias the wing bracket away from the boundaries of the operational angular range, wherein the at least one biasing element (120) is configured to bias the wing bracket within a biasing range adjacent the respective boundaries of the operational angular range, but substantially not to bias the wing bracket within an inner angular range including the middle of the operational angular range.

Abstract: A thrust generator comprising: a motor (17), and a wing mounting (10), comprising a base (11) and a wing (2, 20), the base connected to the motor and configured to rotate the wing mounting about a stroke axis (13) within an angular stroke range, wherein the wing comprises a wing panel (24) having a first longitudinal edge (5) and a second longitudinal edge (6), the wing panel defining a wing surface (4) between the first and second longitudinal edges, and wherein the wing panel is configurable between: a first configuration in which the first longitudinal edge of the wing panel defines a leading edge and the second longitudinal edge of the wing panel defines a trailing edge; and a second configuration in which the second longitudinal edge of the wing panel defines a leading edge and the first longitudinal edge of the wing panel defines a trailing edge, the thrust generator being configured to rotate the wing mounting about the stroke axis in a first direction when the wing panel is in the first configuration

Abstract: A speaker system is disclosed for providing customised acoustical wavefronts with vertical and horizontal pattern control and amplitude and phase control. The system including a speaker housing (1) having therein at least a first array (2) of high frequency driver segments (3) and at least a secondary array (4) of low frequency driver segments (5) disposed behind said first army (2), said first army having sufficient space between said driver segments (3) to allow acoustic transparency whereby a wavefront from said secondary array (4) can substantially pass through said first array (2).

Abstract: A speaker system is disclosed for providing customised acoustical wavefronts with vertical and horizontal pattern control and amplitude and phase control. The system including a speaker housing (1) having therein at least a first array (2) of high frequency driver segments (3) and at least a secondary array (4) of low frequency driver segments (5) disposed behind said first array (2), said first array having sufficient space between said driver segments (3) to allow acoustic transparency whereby a wavefront from said secondary array (4) can substantially pass through said first array (2).

Abstract: A speaker system is disclosed for providing customised acoustical wavefronts with vertical and horizontal pattern control and amplitude and phase control. The system including a speaker housing (1) having therein at least a first array (2) of high frequency driver segments (3) and at least a secondary array (4) of low frequency driver segments (5) disposed behind said first array (2), said first array having sufficient space between said driver segments (3) to allow acoustic transparency whereby a wavefront from said secondary array (4) can substantially pass through said first array (2).

Abstract: A time sharing jammer comprises two sources of jamming signals 1 and a switch 4 for coupling the sources of jamming signals to a microwave power amplifier 6, such as a travelling wave tube. A pseudo random code generator 8 is provided which is arranged to cause operation of the switch 4 whereby the sources of jamming signals 2 are coupled to the power amplifier 6 in accordance with the pseudo random code.