RU2785228C1 - Parachute - Google Patents

Abstract

FIELD: parachute technology.

SUBSTANCE: invention relates to parachute technology, in particular to cruciform parachutes. The parachute comprises a cruciform dome with short blades made of fabric with low or no air permeability and straps attached to the blades and the central part to form a box-like structure. In this case, the length of the blades increases towards their edges.

EFFECT: ensuring a minimum difference in length of the lines attached to the blades, which makes it possible to reduce the likelihood of the lines overlapping the canopy and thereby increase the reliability of the parachute.

2 cl, 5 dwg

Description

The invention relates to parachute technology, in particular to cruciform parachutes [B64D17/02].

Known paddle parachute [RU2336201, publ.: 2008.10.20] cruciform in plan, containing a square Central part and four side blades, each of which is attached to the side of the Central part and is directed from it to the outer edge, the side edges of adjacent blades are connected with the formation of a hole at an angle of the central part for the outflow of air from under the dome, and the parachute is made of a material with zero or close to zero porosity, characterized in that the parachute is equipped with aprons made wedge-shaped in shape and fixed above the holes, with each apron oriented and attached angle to the corner of the central part, and the edges of its two sides forming the angle are fixed on two adjacent blades, in addition, the apron is additionally fixed on the blades with the formation of air channels communicating the hole with the atmosphere, and the area of the outlet sections of the channels located on the free side of the apron , are made identical.

The disadvantages of such a parachute include swaying in the process of descent, as well as a low coefficient of aerodynamic drag - 0.6 ... 0.8.

Known cruciform parachute [RU 22674482, publ.: 2006.01.10], the ends of the blades of which are interconnected with the formation of vertical slots for air release, which allows the use of fabric with zero or low air permeability (porosity). To streamline the opening, a corrugation device is installed on the slings - a slider made in the form of a scarf made of mesh material with a reinforcing frame and eyelets.

The aerodynamic drag coefficient of such a parachute is somewhat higher (0.8…0.9), but it still requires a large area of the parachute.

The cruciform parachute chosen as a prototype is also known [Manual for the operation of the reserve parachute of the EVO Cross series, publ. blades, using fabric with low breathability. The ends of the blades are connected to each other, the length of the blade lines increases towards the edges of the blades, and internal lines are attached to the central part of the dome, forming a box-like structure. The aerodynamic drag coefficient of the parachute exceeds 2, which provides a multiple reduction in the area of the parachute while maintaining a given vertical speed.

The technical problem of this design is the significant difference in the length of the blade lines, which provokes the canopy to overlap with the lines in the process of filling the canopy.

In addition, the box structure is extremely stable, making it difficult to control the parachute.

The aim of the present invention is to eliminate these technical problems.

The technical result of the invention is to provide a minimum difference in the length of the lines attached to the blades, which reduces the likelihood of the canopy overlapping lines and thereby increase the reliability of the parachute.

This technical result is achieved by the fact that a parachute is claimed, containing a cruciform canopy made of fabric with low or zero air permeability with short blades and straps attached to the blades and the central part with the formation of a box-shaped structure, characterized in that the length of the blades increases towards their edges.

Preferably, to ensure horizontal movement of the parachute, the ends of the blades of one corner or two adjacent corners of the parachute canopy are not interconnected or are connected by links of variable length.

Brief description of the drawings

In FIG. 1 shows a general view of the parachute.

In FIG. 2 shows a schematic view from below of the dome.

In FIG. 3 shows a general view of the parachute (part of the lines is conventionally not shown) with unconnected ends of the blades of one of the corners of the parachute canopy (the direction of movement of the parachute is the angle forward).

In FIG. 4 shows a general view of the parachute with the ends of the blades of the adjacent corners of the parachute canopy not connected (the direction of movement of the parachute is the straight side forward).

In FIG. Figure 5 shows a version of the link of variable length connecting the open blades of the parachute canopy - the link is part of the angular line of the parachute.

Implementation of the invention

The claimed parachute (see Figs. 1-3) contains a cross-shaped dome 1 made of fabric with low or zero air permeability with short blades 2 and slings 3 and 4 attached, respectively, to the blades and the central part of the dome with the formation of a box-shaped structure.

What is new is that the length of the blades 2 increases towards the edges of the blades, providing a minimum difference in the length of the lines 3.

In the process of opening the parachute when opening the corners of the blades, the corner lines 3 are divided into two - 3A and 3B.

To ensure horizontal movement of the parachute, the ends of the blades of one corner or two adjacent corners of the parachute dome are not connected to each other or are connected by links of variable length.

An example of how the ends of the blades of one corner or two adjacent corners of the parachute canopy are not connected to each other is shown in Fig. 4, in which the direction of movement of the parachute is straight side forward.

An example of a connection with links of variable length is shown in Fig. 5, where a link of variable length is used to change the dimensions of the angular slot, for example, (see Fig. 5) a 3 V sling passed through the ring 5 and connected to the angle of the adjacent blade 2. Below the 3 V sling through the locking loop 6 passes into the extension 7 passed through the ring 8 at the free end 9.

Links of variable length connect the open blades of the parachute canopy, and the link is part of the angled parachute lines.

The extension 7 is connected to the control link 10, which provides a check-in (temporary shortening of the extension 7 and, accordingly, closing the corners of adjacent blades 2). The lashing loop is pulled in below the ring 8 and fixed with a rigid spout of the control link 10.

After the parachute is filled, the 3 V line is released (and, accordingly, lengthened), retracting or releasing the control link provides a change in the size of the angular gap and, accordingly, the speed of the horizontal movement of the parachute.

In the process of putting the parachute into action, the minimum difference in length of the lines 2 attached to the blades makes it possible to reduce the likelihood of the canopy overlapping with lines, since the smaller the difference in length of the lines, the less likely it is to overlap. It has been experimentally established that the drag coefficient of such a parachute does not decrease.

Adjacent open corners (or one of the corners) of the box-shaped canopy allow horizontal movement of the parachute, and the connection of open blades with links of variable length allows you to adjust the speed of horizontal movement.

The present invention was implemented by LLC "Paraavis" in the parachute systems "Tetragon" ("T-34", etc.) and confirmed the reliability of the parachute.

Claims (2)

1. A parachute containing a cruciform canopy made of fabric with low or zero air permeability with short blades and lines attached to the blades and the central part to form a box-shaped structure, characterized in that the length of the blades increases towards their edges. 2. Parachute according to claim 1, characterized in that to ensure horizontal movement of the parachute, the ends of the blades of one corner or two adjacent corners of the parachute dome are not connected to each other or are connected by links of variable length.

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