Chaff dispensing device.

p0001The invention relates to a dipole arrangement in a sleeve with the sleeve successively arranged sections ejectable dipoles.

p0002From DE-OS 30 15 719 dipole sections of different lengths are arranged in a sleeve sections. The dipole sections are ejected from the sleeve via a piston, the piston is driven by a gas pressure-generating charge.

p0003By GB-PS 834 596 are characterized by loose, thin paper bundled sections of dipoles known which are arranged in a sleeve made of reinforced paper. In addition, it is known as a tail in the mass of the dipoles of a portion of the dipoles directly enveloping paper - approximately in the radial direction - in set.

p0004In an extraordinarily large number of circularly bundled dipoles is finally known to arrange inside the bundle a portion of the cladding as meandering tail. The mass of the dipoles by the tail before in about two equal-sized subsets. Thus the attack surface for the air flow is approximately doubled to form a cloud,

p0005For, arranged in a sleeve dipole sections is required for rapid and large cloud formation that the dipole portions of the sleeve relative lightweight and rapidly ejected are and the individual dipoles independently detach after leaving the muzzle voneinader to a radar-relevant whey to build. In addition to the application of this effect in Rettungsvesen for signal generation is the measure of deception homing radar equipment for aircraft and missiles of importance.

p0006The object of the invention is to provide a structurally simple, inexpensive dipole arrangement for a discharge sleeve which in a short time can be ejected from the sleeve and quickly creates a 'large and homogeneous cloud after the ejection.

p0007This object is achieved by the inventive features of the characterizing part of claim 1. Advantageous developments of the invention are specified in the subclaims.

p0008The metal foil slides very well to the highly polished inner surface of the sleeve, so that the required energy can be made relatively small for discharging the portions from the sleeve. On the other hand, is achieved in a standardized ejection charge over the prior art in that the length of the ejection portions is increased by about 30%. This is when ejected from the aircraft advantageous for the diameter of the whey and the ground-based emissions for the distance and height of the cloud on the ejection, since the portions to travel during the detachment of the dipoles a relatively big way at high average speed.

p0009The prestressed in sections dipoles act as a drive spring for surrounding the metal foil portion so that the number of turns of the metal foil, a time-delayed release of the dipoles is achieved dependent.

p0010The portion having a small number of turns, the dipoles are from earlier than the portion having a greater number of turns.

p0011In stationary arranged sleeve with no wind in 6 meters high, a radar-relevant cloud approximately 4 m in diameter, achieved a cloud in about 4 m height with 3 m diameter and 40 m length with wind speed of 3 m / S.

p0012If ejection of the dipole assembly of an aircraft, a radar-relevant cloud is achieved which is greater by approximately 50% than the side view of an airplane, such as F-104G Starfighter. Also, the diameter of the cloud is larger than the largest cross-section of a fighter aircraft. Thereby there is a allseit effective means of defense against ground-based and air-based defense facilities with homing radar.

p0013After the claim 2 it is achieved that the portion lying at the mouth of the sleeve an envelope with a number of turns from 1.2 to 0.75 after ejection thereafter initiate immediately the cloud formation. The sweep of the enemy radar is very small because the detected as a target by the radar Cloud surfaces much earlier than is produced by the prior art, it is sufficient a cloud formed to 70% in order to deflect the radar from the aircraft.

p0014according to claim 3 of the arranged at the mouth of the sleeve portion without wrapping may be to increase the emergence of the cloud in terms of their radar-relevant intensities.

p0015The claim 4, a frequency spectrum is covered in a simple manner which is per unit area of the finished cloud uniformly present. Decisive here is: The cutting length is selected so that the highest frequency associated dipoles cover about one square meter of the finished whey radar-relevant. Those dipoles of a portion of that seen for themselves in their number is not sufficient to cover one square meter of the finished cloud, are supplemented by corresponding dipoles of other portions to satisfy the aforementioned condition. There is achieved a good distribution of the dipoles in the longitudinal direction of the cloud and in the transverse direction by the unterschiedlic form h long dipoles by swirling the structure in the form of a network.

p0016according to claim 5 it is ensured that in addition to the low friction during ejection of the portions of the sleeve, the unwinding the metal foil from the bundled dipoles due to the low friction between the turns of the film or the dipoles and of the film occurs rapidly. A nest formation by cohesive in large numbers dipoles is thus reliably avoided.

p0017An inexpensive metal foil is shown in the claim. 6

p0018The per section piece metal sheet guarantees of claim 7 that after the ejection of the sleeve - due to the radially expanding dipoles - only plastically deformable metal foil need only wrap radius to increase their is to the number of turns <1 achieved and a sufficiently large distance (window ) is reached between the two ends of the film. Because of this window (package) are by the air flow dipoles from section detached and on the other hand, the film itself is removed from the package. This allows the package without obstacles through the existing still in package clamping force and by the air flowing to a part of cloud. The number of partial clouds of minimally 10 pieces and a maximum of about 25 pieces arise then overlaps the actual cloud.

p0019Embodiments of the invention are illustrated in the drawing. It shows:<ul><li>FIG. 1 an aircraft and clouds formed from separate dipole arrangements,</li><li>FIG. 2 is a dipole arrangement with sleeve,</li><li>Fig. 3 shows a detail III of Fig. 2,</li><li>Fig. 4 is a Calendar of auctions Rules dipole arrangement with sleeve,</li><li>Fig. 5 shows a detail V of Fig. 4,</li><li>Fig. 6 a single dipole section.</li></ul>

p0020According to Fig. 1, a radar grid of an opposing radar with the snap lines 1 to 4 is specified. The grid size is approximately 5 21 m. Between the lines of rest 1 and 2 a plane 6, which has discharged according to arrow 7 in two intervals dipoles 10 to 12, characterized between the lines of rest 2 to 4 lying, radar-relevant cloud 8, 9 were formed. the cloud Comparing the surfaces of aircraft 6 and cloud 8 or 9 so 8 or 9 is approximately 30% larger than the area of ​​the plane illustrated.

p0021The catch lines 1 to 4 correspond to us a conventional radar with a pulse width of 200 at a predetermined target distance. The speed of the aircraft is in this case 300 m / S. The ejection sequence of dipole arrays is 100 m / S.

p0022According to FIG. 2 is a dipole arrangement 13 of a sleeve 14 with a square internal cross-dipole sections 15 to 24, a piston 25 and a lid 26. The inner surfaces 27 of the sleeve 14 are highly polished. The dipoles 10 to 12 are usually made of aluminum coated glass fibers. These glass fibers are strand-like in the longitudinal direction of the sleeve 14, the length of the dipoles 10 to 12 corresponds to the length of the individual sections 15 and 24.

p0023In accordance with the above the sleeve 14 the recorded chart, the numbers of turns for a sheath of smooth-sided (polished) aluminum foil with a covering of approximately 0.1 mm are thinner at the ordinate 28 plotted.

p0024A determined by Erfahrungsverte curve 40 allows the number of turns of the films 31 to 39 for each dipole section 16 to 24 set. Thus, the number of turns for the dipole section 16 is = 1.2, for the section 24 = 4.2 and the section 21 = 2.6 (Fig. 3). The portion 15 at the mouth 45 of the sleeve 14 does not wrap. Here, the dipoles 10 are arranged as a packet section 15 "naked" in the sleeve 14th

p0025Of FIG. 3 can be seen as with a number of turns of the film 36 = 2,6 the beginning 41 of the foil 35 is displaced to the end 42. The film 36 is made der'Fig. 2 extracted and marked the due representation with better spacing between turns. In reality, the turns of the film 36 are close to each other. The contact pressure between the turns of the film is achieved by the insertion of the individual dipole sections 16 to 24 in the sleeve fourteenth Because the portions 16 to 24 have prior to insertion into the sleeve 14 in the circumferential direction larger dimensions than the internal cross-section of the sleeve 14. In order to insert the sections 16 to 24 thus are inserted into the sleeve, the already fertigumwickelten sections 16 to 24 via a suitable device pressed into the sleeve 14th The section 15 is 16 to 24 press-fitted as the last part of the sections in the sleeve, so that the dipoles 10 are biased centripetal.

p0026The operation of the arrangement according to FIGS. 2 and 3 is that the 45 driven in the direction of the mouth of the piston 25 lifts off the lid 26 over the sections 16 to 24 of the mouth 45. Then first the ejected "naked" section 15th The centripetal prestressed dipoles 10 diverge in the radial direction and, after leaving the mouth 45, swirled through the air flowing.

p0027This process is repeated in the following sections 16 to 24, wherein the different numbers of turns of the metal foils of the sections 16 to 24 of the Verwirbelungsbeginn delayed accordingly.

p0028When section 16 with turns = 1.2 clenched dipoles 10 act as a spring element. This spring element acting in the radial direction by the dipole Association expands radially. This makes them act on the metal foil 31 and reduce the number of turns until the metal foil 31 circumferentially releases the dipoles. Then only the swirling of the dipoles 10 by the attacking air flow starts. Here also been subdued metal foil 31 is removed from the dipoles.

p0029The increasing in the direction of the piston 25 of turns of the metal films 31 to 39 in accordance with an increasing delay for the Verwirbelungsbeginn of the dipoles 10 is achieved. This results corresponding to Fig. 1 to an elongated dipole cloud 8 or 9, which is substantially greater on the diameter 100, height 110, and length 120 than the corresponding extent of the aircraft. 6

p0030The according to the required frequency band differently formed long dipole sections 15 to 24, which are arranged in the sleeve 14 about at intervals, it is achieved that the cloud 8 and 9 with each unit area has the required frequency spectrum.

p0031According to FIG. 4 dipole sections 46 to 52 of a dipole arrangement formed 44 as equal length packets. The lying at the mouth 45 of the sleeve 14 portion 46 is only partially wrapped according to the number of turns = 0.75 with metal foil 56th This means that 25% of the package surface attached directly to the inner surface 27 of the sleeve 14, are over 75% of the surface of the metal foil 56 includes.

p0032In order to achieve a required frequency spectrum, the dipole sections 47L49, 51 - lying with in the longitudinal direction of the sleeve 14 dipoles - transversely to the longitudinal axis of the sleeve 14 is cut (cutting line 54). The cut (cut 53) by the metal foil and the dipoles is carried out so that the dipoles 12 (each section 47, 49, 51) with the shortest length (subset 65) covering regarding their number is about one square meter Cloud area radar-relevant.

p0033This also ensures that existing in the same number of dipoles 11 (subset 66) meet the aforementioned condition. The remaining portion of 67 of the dipoles 10 results although - per se - no relevant radar surface of one square meter. This subset 67 is complemented by an adjacent dipoles 10 of the sections 48 and 50th

p0034According to FIG. Ä the cut 53 and the cut line is at 54. The incision is performed to 52 by means of a suitable device prior to the filling of the sections 46 in the sleeve 14 through the metal foil and enveloping the dipoles in question. The uncut dipoles 10 then give the subset 67th

p0035The specified in the upper part of Fig. 4 curve 70 is defined analogously to Fig..2. 2 The curve 70 indicates the number of turns of the metal foil in terms of the respective sections 46 to 52.

p0036The operation of the dipole assembly shown in FIG. 4 corresponds to the described with the Figures 3 and 4 function. By Teilumwicklung, winding number of the section = 0.75 46 7 (FIG. 1) after its ejection in the direction of arrow been described in a manner similar to Fig. 2, the turbulence of the dipoles begin immediately, but only to that of the film 56 non-covered surface. Only after the film 56 is peeled off, the complete dissolution of the section 46 is possible. The swirling of the dipoles 10 is therefore spread over time by the metal foil 56th

p0037In the portions 47,49 and 51, in which each section dipoles having 10 to 12 of different lengths, the metal foil is wound up to a winding number &lt;1 after the discharge from the sleeve 14 due to the radial pressure of the dipoles 10 to 12 and to such an extent to the incoming air, the film has dissolved and the dipoles dissolves and distributed.

p0038In the case of a sleeve having a square internal cross-section, the inner edge length is 22 mm and which is provided in the axial direction to a length of about 180 mm with the described dipole sections and wherein each section about 400,000 dipoles are available, was treated with a single dipole arrangement during ejection from an aircraft with flight speed of V = 300 m / S achieved a radar-relevant cloud with maximum dimensions of about 16 m long, 4.5 m high and 4.5 m diameter.

p0039In the arrangements of Figures 2 to 5, the dipoles are 10 to 12 sämtlicher'Abschnitte in the axial direction of the sleeve 14. Besides, it is in all sections, except for the portions 47,49 and 51, also possible for the dipoles of the sections transversely to the longitudinally of the sleeve to place 14th It can further be used instead of square internal cross-section of the sleeve 14 and a circular cross section.

p0040All the sections 15 to 24 and 46 to 52 contain a "spring elements" acting dipoles 10, 10, 11, 12th

p0041According to FIG. 6, a dipole section 70 to dipoles 10 and a metal foil 71st The film 71 is provided with an integral air brake 72nd The air brake 72 comprises two braking surfaces 73, 74. The braking surfaces are defined by edges 75, 76 of the film 71st

p0042The air brake 72 is located in the sleeve 14 folded accordingly so that it supports after ejection by the air flowing in the direction of arrow 77 air the unwinding of the film 71 of the 70 section. The main idea of ​​this approach is that a very effective air brake is provided by the two bent end of the film 71st

p0043It is the beginning of the unwinding process accelerated. The duration of the unwinding process is not significantly accelerated, since a free end of the film similar to a "flag" because of air turbulence already acts as a brake. These air brake 72 saves space and therefore does not affect the number of dipoles 10 of the section 70th

p0044The above-described measure is also applicable to the incised portions 47, 49, 51st