RU2208542C2 - Method of deploying auxiliary parachute by means of pneumatic gun - Google Patents

Abstract

FIELD: parachute technique. SUBSTANCE: auxiliary parachute is pressed in case made in form of cylinder with hermetic wall provided with pipe union for delivery of compressed air. Case is located separately from main parachute pack. Auxiliary parachute is introduced into air flow by delivery of compressed air to cavity of case. EFFECT: reduced mass; low cost; facilitated procedure of deploying. 8 dwg

Description

 The invention relates to parachute technology and can be used for reliable commissioning of parachute braking and anti-stop systems, in particular aircraft.

 The well-known and used everywhere method of introducing an exhaust parachute into the stream is based on placing in the chamber, along with the main dome (s) and the exhaust parachute, ejecting springs (see the technical description and operating instructions for the PTK-10240-65 series 2 systems; PT-10370 -65; PTK-23-2M; PTK-29; description of the Phantom, Eurofighter, Mirage aircraft).

 The spring 1 is generally conical and made of high alloy steel. Outside, the spring is sheathed with a fabric cover (see figure 1). The ends of the spring are sealed on a small 2 and large 3 base. On a small base, in the center, there is a pin 4 with a hole (see figure 1, view I). The large base 3 is tightly sewn up with a cloth, and in the center of the base there is a grommet with a hole.

 Before installing the ejector spring 1 in the chamber 5 (see Fig.3), the spring is compressed (see Fig. 2), the pin of the small base is passed into the grommet of the large base and is checked by check 6 with a flag. Compressed spring 1 (see figure 3) is located between the main dome 7 of the parachute and exhaust 8 in the chamber 5 and is attached to the pole part of the main dome. The camera 5 in the end part has valves 9 made of durable fabric, which close it with pressed parachutes and, in turn, are also checked. After that, the pin 6 with the flag is pulled out and the spring 1, being released, produces pressure on the main 7 and exhaust 8 parachutes. After installing the camera 5 (see figure 4) in the container 10 of the aircraft and closing the sash 11 of the container, the valve 9 is uncovered. When landing, when you press the "Release the parachute" button, the pilot opens the sash 11 of the container 10 of the brake parachute, and under spring pressure 1 the exhaust parachute 8, pushing the valve 9, is discharged into the stream and, filling, puts into operation the main dome 7 of the brake parachute (see figure 5).

The disadvantages of the output in the flow of the exhaust parachute 8 using the spring 1 are:
- large dynamic loads on the spring when filling the main dome (from 100 to 500g), which leads to deformation of the spring or its break on a small base 2 and the impossibility of its further application;
- due to the friction forces between the pin 6 and the pin 4, in the process of pulling the checks 6, the spring 1 is shifted to the side, which leads to distortions of the spring 1, and the direction of its action becomes unpredictable;
- if the main dome 7 is pressed too far into the chamber 5, the volume for the spring 1 in the chamber 5 becomes increased, which leads to a turn of the spring 1 (when it is installed) across the chamber 5, and as a result, the parachute 7 is not able to exit;
- when withdrawing the exhaust parachute 8 into the stream, the energy of the spring 1 partially goes to the expansion of the valves 9 of the chamber 5, which reduces the efficiency of the spring 1;
- the inability of service personnel to check the installation of the brake parachute 7 in the container 10 of the aircraft by opening the sash 11 and inspecting the state of the valves 9 of the chamber 5, which also leads to failures.

 In addition to the above method of introducing an exhaust chute into the free stream, there is also a pneumatic method - French patent 551310, 1923.

 This patent provides for the placement of the exhaust element in the inner cavity of a cylindrical pipe open on both sides. The inner diameter of the pipe should correspond to the diameter of the exhaust element. On one side of the pipe, at a certain distance from its edge, there is a nozzle for supplying compressed air, which with the help of kinetic energy must throw the exhaust element out of the pipe into the incoming flow.

The disadvantages of this method are:
- large diameter pipe of the container to accommodate the exhaust element;
- the presence of breakage elements on the inner surface of the pipe of the container for fixing the exhaust element:
- the presence of a large power flow of compressed air from the nozzle, which obviously must exceed the power of the incident flow into which the exhaust element must be introduced;
- low efficiency and high consumption of compressed air.

 In connection with the above, the method of introducing the exhaust element into the free stream, proposed by French patent 551310, 1923, has not found practical application on any aircraft.

 The aim of this invention is to simplify the installation of the brake parachute, its absolutely reliable entry into the stream, reducing the cost of the parachute by removing the spring from its composition, the ability to control its installation on an airplane.

 This goal is achieved by the fact that the placement of the exhaust parachute is carried out in a pencil case separate from the main parachute chamber, which is a hollow cylinder with an airtight wall on one side and an exhaust parachute pressed tightly into it on the other hand, and a compressed air inlet is installed in the airtight wall, and the exhaust parachute is introduced into the air stream by the potential energy of compressed air supplied by a short pulse through the nozzle into the cavity between the wall of the canister and pressed into th pilot chute.

The invention is illustrated by drawings, where:
figure 1 shows a General view of the spring;
figure 2 shows a General view of the spring in a compressed state;
figure 3 shows a General view of the camera brake parachute;
in FIG. 4 shows the placement of the chamber in the container of the brake parachute (the chamber valves are notched, but not opened);
figure 5 shows the parachute in the released position;
figure 6 shows a General view of the proposed container (valve chamber is chiseled and fully open in advance);
figure 7 shows a top view of the proposed container;
on Fig shows the end part of the proposed container.

 The device consists of a container 10, a sash of the container 11 and a pencil case 12.

 When the pilot presses the "Parachute Release" button, the shutter 11 opens, after which compressed air (0.1-0.4 s) is supplied to the canister 12. Air enters the space between the canister bottom and the pressed-in exhaust parachute, using its potential energy, pushes the exhaust parachute 8 out. The exhaust parachute 8, being filled, by means of a halyard mounted on the pole part of the main dome 7, draws and puts into operation the main dome of the brake or anti-stop parachute.

Claims (1)

 Pneumatic method of putting the exhaust parachute into operation, characterized in that, in order to increase the reliability of the main parachute output, the exhaust parachute is placed in a pencil case separate from the main parachute chamber, which is a hollow cylinder with a sealed wall on one side and an exhaust parachute pressed into it tightly on the other hand, at the same time, a fitting for supplying compressed air is installed in the sealed wall, and the exhaust parachute is introduced into the air flow by the potential energy of the compressed air spirit short pulse supplied through the nozzle into the cavity between the canister wall and pressed into it pilot chute.

Images