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frame member on the collecting grid to take full advantage of all the ionized particles which are produced. The radially directed emitting wires 12 are used to electrically connect the non-intersecting wires 74 together. However, the emitting wires 12 should be fewer and much 5 less closely spaced than collecting grid wires 14 in order to avoid electrical symmetry. If the configuration of the emitting electrode wires 12 and the collecting electrode wires 14 are identical, no lifting force is provided.

A further embodiment is shown in FIGURE 4 (Sheet 10 2) which is identical with the form shown in FIGURE 3 except that the structure is equipped with positive dihedral for greater stability. Center section 60 is used as a center load carrying or cabin section and the rigid support sections are attached thereto so as to tilt upwardly to form ยก5 a small angle a. Collecting grids 14 and their associated emitting electrodes 12 on opposite sides of center section 60 are thus angularly related.

This particular craft, because of its horizontal symmetry, is well adapted to be equipped with dihedral in 20 the fore and aft direction as well as in the lateral direction. FIGURE 5 (Sheet 4) represents in an exaggerated schematic form an apparatus of this type. In FIGURE 5, the central section as shown in FIGURE 4 has been omitted and the four collecting grids 14 are of a triangular 05 shape with the inverted apex or nadir 69 of the system at the bottom and center of the apparatus. Separate emitting wires 12 are mounted from masts 71 supported centrally of the side edges and at the nadir. Each of the four collecting grids may be insulated from each other 30 by a gap or insulating material and variable resistance incorporated in their lead-in connections (not shown) to the power supply. By independently varying the resistance of the collecting grids the craft, which is here assumed rigid, may be tilted in any direction. 35

FIGURES 6 and 7 (Sheet 3) are top plan and side elevation views respectively of a further embodiment which has a negative dihedral. In this embodiment, the collecting grid frame comprises four outer peripheral lightweight wooden or metal members 600, 601, 602 and 40 603 which are mounted in a lower plane and four inner members 604, 605, 606 and 607 which are parallel to the respective outer members but in a plane higher than the plane containing the outer members. In an embodiment where the outer peripheral members were three feet long, the vertical distance between the planes carrying the inner and outer members was four inches. This negative dihedral has been found to provide greater stability during hovering flight than the positive dihedral though the positive dihedral appears to provide equally good sta-bility for horizontal flight.

The collecting grid is divided into four equal areas by diagonally oriented frame assemblies 608, 609, 610 and 611. The collecting grid area visible in FIGURE 7 is bounded by rigid frame members 612 and 613 of diagonal frame assemblies 608 and 609 respectively and inner and outer frame members 604 and 600. The collecting grid, as pointed out above, may be a crossed grid of wires. The other three collecting grid areas are of identical size and construction." w

Inside of inner frame members 604, 605, 606 and 607, no collecting grid screen is provided and the space may be left open or if desired, covered with a lightweight foil of insulating or conducting material. This air-tight foil forms a pocket under which a pressure appears to build up g^ to provide added lift The insulation material is preferred since this does not interfere with the electrical isolation between the four quadrants of the collecting grid which, as will be pointed out below, are used for guiding and/or propelling the craft. 70

Diagonal frame assembly 608 contains four cross braces 626, 628, 630 and 632 between frame members 612 and 613. The cross braces arc made of an insulating material such as wood to thereby insulate cach of the four grid sections from one another. Frame members 612 and 613 75

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