Hang-glider Vympel-9. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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Hang-glider Vympel-9. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

According to the directive of the Central Committee of DOSAAF dated May 25, 1979, hang gliding clubs are allowed to build hang gliders only according to drawings approved by the technical commissions of local hang gliding federations. In addition, flights on self-built vehicles must be carried out only after their examination by representatives of technical commissions on the ground. This decision is due to the need to ensure flight safety both during training and in the process of sports performances and is designed to reduce to zero the still existing cases of injuries.

(click to enlarge)

One of the first devices recommended by the technical commission of the Moscow Federation as the main sports model of the open class is the Vympel-9 hang glider. It was designed on the basis of the serial French apparatus SK-2 provided to us by M. Gokhberg. "Vympel" turned out to be a fairly simple and reliable aircraft with high flight performance, in particular, with excellent maneuverability. Despite the small dome (40 '), it has quite sufficient stability and at the same time good handling. Such characteristics are obtained due to the selection of the rigidity of the side pipes, the use of reinforcing bushings, rigid profiling of the central part of the dome (in front - with a profiled pipe and behind with the help of a special rack).

With the frame of this hang glider, you can use three sets of sails of different areas, which have different aerodynamic characteristics. Each sail is available in two versions - single and double. Sails with a double surface are equipped with profiled battens that run along the entire chord of the wing and rest on the front ends of the main frame tube.

Main technical characteristics:

Span - 9,55 m, sail area - 16,4 m2, speed range - 25-60 km / h, aerodynamic quality - 8. A complete set of working drawings of the apparatus was distributed by the federation to the country's leading hanging clubs for study and improvement in relation to their own production opportunities.

The main differences between the Vympel-9 model described in this issue of the magazine and the SK-2 are as follows:

instead of dacron 914 mm wide, domestic lavsan (yacht fabric) 800 mm wide was used for sewing the sail, which led to a change in the sail in plan, the number of seams and the location of the armor;
a new design of the central node was introduced;
used armor, profiled to the front pipe.

The expediency and necessity of the modifications made were shown by comparative tests of hang-gliders SK-2 and Vympel-9. The main characteristics of the "Vympel" did not differ from the SK-2, and the result of flight tests was the recommendation of the bureau of the Moscow Federation of Hang Gliding to use the design of the "Vympel-9" for its manufacture in sections and hang-gliding clubs with practical experience in the development and construction of complex devices. The drawings of the device are coordinated with the technical commission of the All-Union Hang Gliding Federation.

(click to enlarge)

Hang-glider "Vympel-9" (click to enlarge): 1 - sail, 2 - bow assembly, 3 - fairing, 4 - mast, 5 - side pipe, 6 - reinforcing sleeve (stocking), 7 - transverse pipe, 8 - rack sail mounts, 9 - keel tube, 10 - central assembly, 11 - control trapezoid, 12 - instrument cluster, 13 - guy line kit, 14 - batten, 15 - side knot, 16 - batten retainer, 17 - set of supplies and accessories, 18 - cover, 19 - equipment

The frame of the apparatus is shown in Figures 1, 2 and 4. It differs from the previously described traditional structures by a profiled fairing in the front part of the keel tube, as well as by the side tube docking system and the design of the central unit. The ordinates of the fairing profile are shown in Figure 3. I would like to note that all the details of the frame are very technologically advanced and there cannot be any special difficulties in their manufacture.

The sail (dome) consists of two semi-wings. Their design is absolutely identical, with the only difference that the right half-wing is a mirror image of the left. Each is sewn from five straight pavsan panels; their location is shown in Figure 2. Each semi-wing is supported by seven armor, five of which are parallel to the keel tube. The half-wing tips form two battens, they are set at an angle to the central beam.

Lavsan panels are interconnected by parallel lines with a zigzag seam. Lat pockets 35 mm wide are formed in the overlap of the longitudinal seams. Lat pockets for the first version of the sail reach only the seam of the sleeve of the side tubes, while the battens from the first to the fifth are straight, and the sixth and seventh must be profiled and rest on the side tube with their ends.

For the second version of the sail, all battens are made profiled, their battens reach the side tubes, while the battens themselves rest with their front ends on the side tube.

The correctness of the manufacture and installation of the sail can be checked according to the table. On it you can check the line of sagging of the trailing edge, for which the hang glider with the canopy installed on it must be positioned with the control stick up. One of the reasons for the significant deviations of the sagging line from the tabular one is the errors made when stitching the panels; the only remedy for this defect is to remake the entire seam. It is especially important to achieve the symmetry of the right and left half-wings, otherwise the effect of "stall on the wing" is inevitable, which is very unpleasant and dangerous for the pilot.

Stretch marks and fittings are shown in the figures. All these structural elements are preferably made of stainless materials. Cables must be in a polyethylene sheath; buckles, slats, bolts and fingers - have a protective coating.

Authors: V.Bugrov, N.Grushin

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