RU2388655C1 - Kite with variable-curvature wing - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to paraplanes. Proposed kite comprises canopy, canopy shroud lines, control strips connected with the latter and control handles and load-bearing strips connected with handles and canopy shroud line. Line end has loop and fan-out into two lines, each with its end furnished with loop connected to canopy shroud lines via line and with control line via line, loop and roller, control line being connected with plate end. Additional load-bearing strip is connected to plate central line, additional line end having a loop and fan-out into two lines, each being connected via additional roller with the loop of load-bearing strip at the point of its secondary fan-out from the plate.

EFFECT: increased thrust at weak wind and stability at strong wind.

2 dwg

Description

Application area

The invention relates to paragliders, and more particularly to kites with a strap, and can be used in light and strong winds.

State of the art

Kites are like a smaller paraglider (soft wing), controlled by a system of two or four flight slings with a length of 10 to 50 meters. The longer the lines, the greater the thrust of the wing, but more difficult to control and the risk of tangling the lines increases.

The kite consists of: a dome (wing), dome lines, power lines, control lines, controls (handles, bar) and a release system.

Frame (balloon) kite. The wing is made of one layer of fabric. To give the wing an aerodynamic shape and the possibility of raising the kite from the water, inflatable balloons were sewn to the wing: one central on the front (leading) edge and several at an angle to the rear edge. On traditional kites of this design there are no dome lines and control lines are attached directly to the ends of the wing. On bow-kites there is an A-row of dome lines, which allows more efficient use of the area of the kite.

Parafoil is a small paraglider. The wing consists of two layers of fabric, defining the longitudinal shape of the kite and internal ribs forming the transverse shape of the wing. Ribs can be straight and oblique (on more expensive kites). Oblique ribs can reduce the number of dome lines and, accordingly, the kite's resistance in flight. To fill the wing with air, the front edge of the kite has air intakes - special openings that can be open, covered with a net or equipped with valves. For the best air distribution inside the wing, holes are made in the ribs. Loops are attached to the ribs, for which dome slings are attached. Typically, dome slings are arranged in rows, starting from the leading edge, A, B, C and D rows are considered. As a rule, power slings are attached to the A, B and C rows, and control slings are attached to the D row. On the edges of the dome (ears) on some kites there are special drainage valves to remove foreign objects (water, debris, sand, snow, etc.).

Dome slings, as a rule, are configured by the manufacturer and largely determine the shape of the wing. Some manufacturers allow intervention in dome adjustments in order to change the angle of attack, twist the ears, etc. Power lines and control lines are attached at one end to the dome lines and at the other end to the controls (handles, strap). As a rule, power slings and control slings are made of polyethylene. Depending on the purpose, the thickness of the slings varies: slings with a strength of 80 to 300 kg at break are used. The length of the lines varies from 40 to 20 meters (the smaller the area of the kite, the shorter the control lines). Loops are made at the ends of the slings, with the help of which the control line is connected to the dome lines and controls. These connections occur by tightening the stranglehold loop of the control lines on the knots that end the dome lines and control leashes.

Controls include pens or bar.

Most often, racing kites, or kites for elementary training, kites for beginners are supplied with pens. Leads from a cord 5-6 mm thick are attached to the curved handles. Power slings are attached to the upper leashes. To the bottom - control slings that are attached to the rear edge of the kite. The upper ends of the handles are connected by a special rope end, which is used to connect to the trapezoid roller. The control bar is most often supplied with freeride kites, since the device of the bar allows the use of several kite traction control systems. Power slings connected above the bar go to its middle and, passing through the hole in the bar, are attached to the chicken-loop system. This system allows you to attach the bar to the hook of the trapezoid and prevent the kite from being unintentionally disconnected from the pilot. In addition, between the chicken-loop system and the power lines there is a quick release system that allows you to very quickly disconnect the kite from the pilot in case of a dangerous situation. Above the bar on the power slings there is a system for adjusting the angle of attack of the kite - a trimmer. The essence of this adjustment is to change the angle of attack of the wing to the incoming air flow. When the trimmer is released, the kite’s thrust increases, but the kite’s flight performance deteriorates. When the trimmer is tightened, the kite’s thrust drops, but it flies much better. Using the trimmer, you can adjust the kite traction on the go. In addition to this adjustment, there is one more that can instantly change the thrust of a kite. This system, “the bar to oneself and from oneself,” acts similarly to the trimmer, but is more efficient. This system is good for practicing gusts of wind and when jumping. The straps have different lengths: the smaller the area of the kite, the shorter the strap.

Kites with handles have a small wind range, because they do not have the ability to reduce the angle of attack of the wing and its traction with increasing wind.

A kite of suitable area is used for each wind power.

Kites with straps have a wide wind range, because they have the ability to reduce the angle of attack of the wing with increasing wind, but they do not have the ability to increase the curvature of the wing profile to the optimum value in light winds. The safety system also includes a leash, which is attached to the control feet at one end and the pilot’s equipment at the other. In case of activation of the security system on the chicken-loop, the kite remains attached to the pilot only through a lish. But if the situation is completely bad, then the pilot can unhook the leash from himself.

The prior art solution is known [1]. The device is a balloon kite. The lengths of the lines change when you move the bar. Management is performed by changing the angle of installation of the profile. This solution allows you to change the angle of attack to change traction. The disadvantage is the low thrust of the kite in light winds due to the small curvature of the profile. The prior art solution is known [2]. The device is a balloon kite. The lengths of the lines change when you move the bar. Management is performed by changing the angle of installation of the profile. This solution allows you to change the angle of attack to change traction. The disadvantage is the low thrust of the kite in light winds due to the small curvature of the profile. The closest analogue is the Ozone Frenzy kite [3]. It is a kite with a bar. The control lines are connected to the dome lines through the rollers. A power sling is attached to the central sling of the bar, at the end of which a loop and branching into two slings are made, each of which has a loop at the end connected by at least one sling with dome slings and at least one sling through a loop and a roller with a control sling connected to end of the bar.

The lengths of the lines change when you move the bar. Management is performed by changing the angle of installation of the profile.

The solution provides a large wind range by changing the angle of installation of the profile. The disadvantage is the low thrust of the kite in light winds due to the small curvature of the profile.

Technical result: it is possible to increase traction in light winds and increase stability in strong winds.

The implementation of the invention

The claimed technical result is achieved due to the fact (see Figure 1) that the kite with a strap (12) as a means of control, containing a dome (wing) (1), dome slings (2), control slings (11) connected to domed slings (2) through rollers (3, 4) containing a power sling (10) connected to the central sling of the strap (12), a loop (15) and a branching into two slings (16), each of which has at the end, a loop (7) connected by at least one line with dome lines (2) and at least one line through a loop and roller (3 and / or 4) with a control line (11) connected to the end of the bar (12), characterized in that an additional power line (9) is attached to the central line of the bar, at the end of which a loop (14) and a branch into two lines (8) are made, each of which through an additional roller (5) is connected to the loop (7) of the power line in place of its secondary branching from the strap. The curvature of the profile of the dome (wing) (1) is adjusted using an additional power sling (9). When tightening the slings (9), the curvature of the profile decreases to reduce traction and increase stability in strong winds. When releasing the slings (9), the curvature of the profile of the dome (wing) (1) increases in order to increase traction in light winds. An additional degree of freedom in the kite management system allows the user to expand his wind range.

Figure 2 shows examples of changes in the curvature and angle of attack of the wing profile for different wind forces, where a and b are the profile for medium wind strength, c and d are the profile for strong winds, e and e are the profile for light winds. In the known solutions [1, 2, 3] in kites with a bar, the curvature of the wing profile can only change together with a change in the angle of attack according to a fixed law. In the claimed solution due to the introduction of an additional sling, the curvature of the profile can change regardless of the angle of attack.

Information sources

1. Patent FR 2887223.

2. Patent FR 2873093.

3. http://www.flyozone.com/landkites/en/products/de-power-kites/frenzyfx/.

Claims (1)

A kite with a strap as a control tool, containing a dome (wing), dome slings, control slings connected to dome slings through rollers, containing a power sling attached to the central strap sling, a loop and a branching into two slings are made at the end of the sling, each of which has a loop at the end connected by at least one line with dome lines and at least one line through the loop and roller with a control line connected to the end of the bar, characterized in that it is attached to the central line of the bar and an additional power sling, at the end of which a loop and branching into two slings are made, each of which is connected through an additional roller to a loop of a power sling in the place of its secondary branching from the bar.

Images