RU2263275C1 - Towed false air target - Google Patents

Abstract

FIELD: war materiel; protection of flying vehicle against homing missile.

SUBSTANCE: proposed towed false air target is made in form of streamlined body which is provided with rope and drogue in whose head and tail compartments drogues are mounted coaxially with hull; target is also provided with two rotating rings; ring of head compartment has hole for passage of rope. Mounted in between rings of head and tail compartments is cylindrical fairing which rigidly secured on them; it is rotatable relative to drogue axis and is provided with cut in end part for free escape of rope.

EFFECT: improved aerodynamic characteristics of towed false air target.

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Description

The invention relates to the field of aviation technology and can be used as a towed false target when protecting an aircraft from a homing missile by re-targeting it on a false target towed at a certain distance from the aircraft.

A device is known comprising an aircraft, a winch, a rope connected to a target, and a cutter. On the aircraft, by means of a winch with a rope, a target for training firing is suspended [1].

The disadvantage of the described device is the limited speed of winding the rope from the winch drum, and, as a consequence, the insufficient speed of removal of the target from the side of the aircraft due to inertia of rotation of the moving parts of the winch and the mass of the rope remaining on the winch drum at any time. In addition, at aircraft speeds of more than 0.5 M (in Mach numbers), returning the target to the board creates an emergency situation due to unsteady flight of the target in the air stream during pulling up, which requires a priori chopping of the rope.

A device is known which is a towed aerial false target containing a target connected by a rope to an aircraft. A ring is mounted in the head of the target for rotation about the axis of the target. A hole is made in the wall of the ring through which the end of the rope fixed on the aircraft is freely passed. The rope itself is wound in several layers on the target body [2].

The disadvantages of the described device [2] are the reduced aerodynamic characteristics of the target during towing due to the additional longitudinal drag force of the hull caused by the deterioration of the air flow around the target surface due to the diameter difference in the middle part of the target after winding the towing rope.

Well-known methods of reducing the additional longitudinal drag force caused by the deterioration of the flow around certain parts of the surface of aircraft (LA) or structural elements of the aircraft, protecting them with a fairing.

The invention is aimed at improving the aerodynamic characteristics of a towed airborne false target, reducing the aerodynamic load on the towing rope and, accordingly, reducing the requirements for the strength characteristics of the towing rope.

This is achieved by the fact that the device uses a well-known method of reducing the additional longitudinal resistance force due to the installation of a fairing in the central part of the towed airborne false target.

The invention differs from the known closest analogue [2] containing a target connected by a rope to the aircraft, in the head part of which a ring is mounted with the possibility of rotation about the axis of the target and with an opening in the wall through which the end of the rope mounted on the aircraft is freely passed, and the rope is wound in several layers on the target body, so that an additional ring is installed in the rear of the target with the possibility of rotation about the axis of the target, and between the head and tail rings of the mouth copulating and rigidly secured to their cylindrical fairing rotatably and having a notch in the free end portion of the rope to exit.

The combination of essential features that distinguish the invention from the specified analogue, during the implementation of the invention improves the aerodynamic characteristics of the towed aerial false target, reduces the aerodynamic loads on the towing rope and, accordingly, reduces the requirements for the strength characteristics of the towing rope.

The invention is illustrated by drawings, where figure 1 shows a towed aerial false target (target) in the initial state; figure 2 - the same target after the complete unwinding of the rope in the process of towing.

The described device of FIG. 1 comprises: a rope 1, a ring 2 with an opening in the side wall, a target body 3, a node 4, a ring 5, and a fairing 6 with a cutout on the end part. The rope 1 is connected at one end to the target body 3 and is wound on the target body in several layers. The second end of the rope 1 is freely passed through the cutout on the end of the fairing 6 and the hole in the wall of the ring 2. Additionally, the introduced ring 5 is mounted coaxially in the rear of the target with the possibility of rotation about the axis of the target. The cylindrical fairing 6 end parts are rigidly fixed to the rings 2 and 5 with the possibility of rotation with them in the process of winding the rope. The node 4 is intended for fastening the rope to the aircraft using, for example, pyro-bolt.

A device mounted on an aircraft in a container or in another way, at the moment of the guided missile attack, is separated from the aircraft on command from the aircraft, and under the influence of the aerodynamic force of the incoming flow, the rope 1 is unwound from the target body 3 and freely passes through the cutout on the end part of the fairing 6 and the hole in the wall of the ring 2. Ring 2, ring 5 and the fairing 6 are rigidly interconnected and rotate freely under the action of the orthogonal component of the rope tension force.

Figure 2 shows a drawing of a towed false target after winding the rope to a length L. The digital designations of the structural elements in Fig. 2 correspond to the digital designations in Fig. 1. The fastening of the rope 1 on the aircraft is carried out for the node 4 using pyrobolt or in another known manner. After completing a combat mission, the rope along with the target is dropped on command from the board by applying an electrical signal to the pyro-bolt.

To redirect an attacking missile to a false target, the target can be equipped with active means of simulating a radar portrait of an aircraft or include pyrotechnic means to counter missiles with thermal homing heads.

Figure 3 shows an example implementation of the towed false target. The numerals 1, 2, 3, 4, 5, and 6 in FIG. 3 correspond to the numerals in FIG. 1 and FIG. 2. The remaining structural elements in figure 3: radiotransparent fairings 7 and 8; the base of the head antenna unit 9; the base of the tail antenna unit 10, bearings 11 and 12. The bearings 11 and 12 are pressed into rings 2 and 5 and are mounted, respectively, on the narrow parts of the bases of the antenna units 9 and 10, which are rigidly connected to the target body 3.

Tests of the winding mechanism confirmed its performance. The winding speed was 8-12 m / s for a steel rope with a diameter of 1.6 to 3.0 mm.

Since the fairing 6 and the additionally introduced ring 5 are practically not mechanically loaded, their mass can be insignificant, and, accordingly, the influence of their inertia of rotation on the rope winding speed is not significant.

Sources of information

1 Description of the invention to the patent of the Russian Federation No. 2067280, F 41 J 9/10, B 64 D 3/02, Bull. No. 27, 09/27/96.

2 Description of the invention to the patent of the Russian Federation No. 2206049, F 41 J 9/10 (Prototype). Bull. No. 16, 06/10/2003.

Claims (1)

A towed aerial false target made in the form of a target connected by a rope to the aircraft, in the head part of which there is a ring with the possibility of rotation about the axis of the target and with a hole in the wall through which the end of the rope fixed on the aircraft is freely passed, and the rope itself is wound in several layers on the target body, characterized in that in the rear part of the target an additional ring is mounted with the possibility of rotation about the axis of the target and between the head and tail rings coaxially and rigidly secured to a cylindrical radome rings rotatable about the axis of the target, which has a cutout at the end portion to the free rope exit.

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