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An unmanned air vehicle (UAV) having a ducted fan configuration with a propeller mounted inside of an opening that extends longitudinally through a fuselage. A gyroscopic stabilization device is attached to the propeller shaft such that rotation of the propeller shaft also results in rotation of the

An unmanned air vehicle (UAV) having a ducted fan configuration with a propeller mounted inside of an opening that extends longitudinally through a fuselage. A gyroscopic stabilization device is attached to the propeller shaft such that rotation of the propeller shaft also results in rotation of the gyroscopic stabilization device. The gyroscopic stabilization device has sufficient mass and rotates at a sufficient angular velocity such that the aircraft is gyroscopically stabilized during flight. In one embodiment, the gyroscopic stabilization device comprises a ring mounted to the outer tips of the propeller and in another embodiment is comprised of a disc.

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An unmanned air vehicle (UAV) having a ducted fan configuration with a propeller mounted inside of an opening that extends longitudinally through a fuselage. A gyroscopic stabilization device is attached to the propeller shaft such that rotation of the propeller shaft also results in rotation of the

An unmanned air vehicle (UAV) having a ducted fan configuration with a propeller mounted inside of an opening that extends longitudinally through a fuselage. A gyroscopic stabilization device is attached to the propeller shaft such that rotation of the propeller shaft also results in rotation of the gyroscopic stabilization device. The gyroscopic stabilization device has sufficient mass and rotates at a sufficient angular velocity such that the aircraft is gyroscopically stabilized during flight. In one embodiment, the gyroscopic stabilization device comprises a ring mounted to the outer tips of the propeller and in another embodiment is comprised of a disc. antially equal to the diameter of the balls. 8. The filling device of claim 6, wherein at least the lower surface of the track-defining member is formed of a resilient material and the lower surface of the track-defining member is spaced relative to the lower surface of the housing such as to define a channel having a height less than the diameter of the balls, whereby balls are biased downwardly when located beneath the track-defining member. 9. The filling device of claim 3, wherein the track-defining member is movably disposed relative to the housing, and further comprising: a loading element for biasing the track-defining member downwardly relative to the lower surface of the housing. 10. The filling device of claim 9, wherein the biasing force of the loading element is such as to maintain a single layer of balls therebeneath. 11. The filling device of claim 1, further comprising: a reservoir for containing a supply of balls; and at least one channel connecting the reservoir to the chamber. 12. The filling device of claim 11, wherein the lower end of the at least one channel is spaced from the lower surface of the housing such as to restrict the fill level of balls in the chamber. 13. The filling device of claim 11, wherein the distribution means comprises a track-defining member having a lower surface operably disposed in spaced relation to the lower surface of the housing such as to define a track of restricted height therebeneath when disposed over the ball-receiving element, and comprising at least one channel adjacent a forward edge of the track-defining member in a direction of movement. 14. The filling device of claim 13, comprising at least one channel adjacent each of forward and rearward edges of the track-defining member in a direction of movement. 15. The filling device of claim 11, comprising a plurality of channels. 16. The filling device of claim 1, wherein the distribution means comprises at least one channel through which balls are in use supplied to the chamber, the lower end of the at least one channel being spaced from the lower surface of the housing such as to restrict the fill level of balls at at least a region of the opening in the housing. 17. The filling device of claim 16, comprising a plurality of channels. 18. The filling device of claim 1, wherein the distribution means comprises first and second downwardly-extending members which define an enclosed space therebeneath, the downwardly-extending members being configured to allow only a limited number of layers of balls to pass therebeneath. 19. The filling device of claim 18, wherein the first and second downwardly-extending members are laterally spaced. 20. The filling device of claim 18, wherein the first and second downwardly-extending members are downwardly and outwardly flared. 21. The filling device of claim 18, wherein the downwardly-extending members are formed of a resilient material. 22. The filling device of claim 1, wherein the distribution means comprises at least one projection extending inwardly of the housing and including a surface having a forward and downward component in a direction of movement. 23. The filling device of claim 22, wherein the at least one surface is a substantially planar surface. 24. The filling device of claim 22, wherein the at least one surface is a curved surface. 25. The filling device of claim 22, wherein the distribution means comprises first and second projections, each extending inwardly and including a surface having a forward and downward component in the respective directions of movement. 26. The filling device of claim 1, wherein the housing includes a wiper disposed internally along one, rearward edge thereof in a direction of movement. 27. The filling device of claim 26, wherein the housing includes wipers disposed internally along each of the edges thereof in the respective directions of movement. 28. The filling device of claim 1, wherein the balls comprise solder balls. 29. A ba ll bumping apparatus, comprising: a ball bumping station comprising a filling device for filling balls in an array of apertures in a ball-receiving element, the filling device comprising a housing including an opening at a lower surface thereof and defining in part a chamber for containing a supply of balls, the housing being in use movably disposed over a ball-receiving element including an array of apertures, and distribution means disposed within the housing for distributing balls contained in the chamber such as to maintain a limited number of layers of the balls over at least a region of the opening in the housing, and a ball-receiving element including an array of apertures over which the filling device is in use movably disposed. 30. The ball bumping apparatus of claim 29, wherein the ball-receiving element comprises a mask including an array of apertures. 31. The ball bumping apparatus of claim 29, wherein the ball-receiving element comprises a template including an array of apertures. 32. The ball bumping apparatus of claim 29, further comprising: a stencil printing station for printing an array of ball-retaining deposits on a substrate, the stencil printing station comprising a stencil including an array of apertures having the same pattern as the array of apertures in the ball-receiving element, and a print head for delivering a ball-retaining material to the surface of the stencil. 33. The ball bumping apparatus of claim 32, wherein the filling device and the print head are configured to be moved in unison such as to print ball-retaining deposits on one substrate at the same time as providing a ball grid array on another substrate. 34. A method of filling balls in an array of apertures in a ball-receiving element, comprising the steps of: providing a filling device over a ball-receiving element including a plurality of apertures, the filling device comprising a housing including an opening at a lower surface thereof and defining in part a chamber containing a supply of balls, and distribution means disposed within the housing for distributing the balls contained in the chamber such as to maintain a limited number of layers of the balls over at least a region of the opening in the housing; and moving the filling device relative to the ball-receiving element such as to cause the filling of the apertures in the ball-receiving element. 35. A filling device for filling balls in an array of apertures in a ball-receiving element, the filling device comprising: a housing including an opening at a lower surface thereof and defining in part a chamber for containing a supply of balls, the housing being in use movably disposed over a ball-receiving element including an array of apertures; and distribution means disposed within the housing for distributing balls contained in the chamber, the distribution means being configured to provide substantially a single layer of balls over at least a region of the opening in the housing.