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MODELING
Ribbon instead of a parachute. Tips for a modeller
Directory / Radio control equipment Models of rockets of category S6. Four classes include category S6 - missile models for flight duration with a tape. In my opinion, this category captivates both spectators and athletes with its entertainment. After all, the entire flight takes place, as they say, in plain sight. These models and competitions are the best suited for beginner athletes "rocketmen". The championship class in the S6 category for both boys and adults is one - S6A. The technical requirements for a sports "projectile" are as follows: one engine (impulse - no more than 2,5 ns) - one, length - at least 500 mm, body diameter - more than 40 mm, starting weight should not exceed 100 g, maximum fixed time in the round - 3 minutes (180 points). The main part (a kind of rescue system) that provides the longest flight time is brake bands, the number of which is not limited for competitions. They are made of a homogeneous, non-perforated material with a length to width ratio of at least 10:1. In flight, the tape must be fully unfolded. The athlete can use any tape, depending on the weather conditions. It must be admitted that since the "birth" of this category (S6), all design and technological developments have been carried out mainly with brake bands. Here is the direction of these searches: the choice of dimensions and material, thickness and laying methods. Start conditions dictate to the participants of the competition and the choice of the type of brake band. So, for wind you need a "hard" tape, for calm - "soft". The degree of "rigidity" determines the thickness of the starting material - the film. For the former, it ranges from 0,015 to 0,025 mm, for the latter it is about 0,01 mm. It must be admitted that the FAI code does not limit the number of brake bands for competitions. Ways of laying the brake tape - a great many, the most common - "accordion". It resembles the bellows of a Russian musical instrument. Step (fold width) - from 5 to 25 mm. Many athletes, after folding the tape, subject it to molding (heat treatment). When folded, the tape is clamped into the device and kept in this state at a temperature of 55 ° - 60 ° C. Such processing of the brake band increases its rigidity, it keeps the "accordion" for a long time. The best athletes for each flight in the new tour use a different tape, allowing time for the "rest" used.
A good confirmation of the above are the brake bands of the 2006 world champions among adults - Polish athletes. Their dimensions are as follows: length - 1050 mm, width - 97 mm, accordion pitch - 4 - 5 mm, film thickness - 0,02 mm. In the program of the world championships, the starts of the category of models with a ribbon (S6) were included in 1978. It was the third world championship in a row and the first in which Soviet athletes made their debut. The only medal - bronze was won then by the author of these lines. Since then, our athletes have become winners, but not champions in different years: Oleg Belous, Viktor Kuzmin, Yuri Firsov, Sergei Ilyin and Oleg Voronov. At the first World Ikareade held in 1997 - a kind of Olympic Games in aviation sports, Nikolai Tsygankov became the champion in the category (S6). Currently, the category of the model with a ribbon is the most popular. It is in it that the largest number of athletes always participate. And this category is included in the program of all stages of the World Cup. Today the story is about champion models in the category (S6). The proposed model of the S6B class rocket (Fig. 1) was developed by designer Alexander Tarasov (Yugorsk). This class of sports models with an engine up to 5 n.s. for many years has the right to "citizenship" in the championships. The body is molded in one piece on one mandrel with the largest diameter of 39,9 mm. The thickness of the used fiberglass is 0,03 mm, the winding is in two layers. Before forming, the fiberglass is annealed, and the mandrel is slightly heated and lubricated with a separating mastic ("Edelvaks"). To avoid the occurrence of air bubbles between the layers during knurling, the still raw workpiece is wrapped with a tape 10 - 12 mm wide and placed in an oven with a temperature of 60 - 70 ° WITH.
After the resin has dried, the resulting workpiece is processed with a file. Then cut with a sharpened cutter to the desired length. Stabilizers are cut from a 0,6 mm thick balsa plate treated and reinforced with fiberglass. In a package (3 pcs each), they are brought along the contour to the desired shape and fastened end-to-end to the engine compartment of the hull. To one of the stabilizers, pre-wrapped with threads with resin, the MRD fixer is glued - a piece of OBC wire with a diameter of 0,8 mm with a bent end protruding beyond the cut of the body by 6 - 7 mm. A suspension thread is attached to another stabilizer. The head fairing with a slightly rounded top (rounding radius - 4,5 mm) is molded similarly to the body. Connecting sleeve - a piece of fiberglass tube 35 mm long with an outer diameter of 39,9 mm is glued at one end into the lower part (skirt) of the fairing. A balsa frame with a loop connected to the suspension thread is glued into the other end of the bushing. The brake band fastening thread is also tied to it. Streamer (brake band) - dimensions 1550x150 m - made of rigid lavsan film 0,024 - 0,03 mm thick. The weight of the model without MRD and brake band is 7 g. Sports model of the S6B cpass rocket (Fig. 2) of the champion of Russia S. Romanyuk (Uray) is a typical representative of the aircraft of the so-called "Ural" scheme, the author and developer of which is a team of rocket modellers in Chelyabinsk under the guidance of the honored trainer of Russia V.I. .Tarasova. The model is made using a fairly well-known technology. The body is a fiberglass tube of variable section, the maximum outer diameter is 40,3 mm, the minimum is 10,4 mm. Material - fiberglass with a thickness of 0,03 mm in two layers and epoxy resin ED-6. After the binder has cured, the mandrel with the body blank is processed in a lathe (at 600 - 700 rpm) and cut to the required length - 405 mm. Then the mandrel is slightly heated and the finished body is removed from it. Using the same technology, a head fairing and a connecting sleeve 30 mm long are molded. It is glued into the fairing skirt to a depth of 5 mm, having previously degreased its inner surface. The other (end) end of the sleeve is closed with a balsa frame 1,5 mm thick, into which a loop of strong thread is glued. Then the thread of the suspension of the hull and the rescue system is tied to it. Stabilizers are made of 0,7 mm thick balsa plate, their side surfaces are glued with fiberglass on epoxy resin. They are glued to the body end-to-end. A Kevlar suspension thread is attached to one stabilizer. The brake tape (streamer) is cut out of polygraphic lavsan film 0,025 mm thick, its dimensions are 1450x110 mm. Weight of the model without streamer and MWP -10 g. "Universal" of Polish athletes (Fig. 6). You don't see that often. I must say that this is the first time in my memory. Both champions in the same class (SXNUMXA) among juniors and among adults from the same team - Poland. But that's not all. They are Michal Kumar and Leshik Malmuga - student and coach. One can only rejoice at such a creative community. Yes, and their sports "shells" - models of rockets aroused great interest among the participants and specialists of the 16th World Championship in Baikonur. At first glance, it seems like nothing special. Plain, traditional design. But there is something in it that, in my opinion, deserves attention. Moreover, this sports "projectile" is used by Polish athletes in two categories - S6A and S9A. Yes, and in the category of rotochutes (SXNUMXA), the base (body) is made in a similar way. One of the features of the model is a rather long tail cone - 148 mm. This can be seen as the desire of the designers to at least slightly lighten the stern due to the consumption of material for the hull and stabilizers. Another feature is the original decision to eject the model rescue system from the hull and a completely unusual use of a wad. But more on that below.
The body is made of two layers of glass fabric of 39,9 thickness on a mandrel of variable section, the maximum diameter of which is 10,2 mm, the minimum diameter is XNUMX mm. On this part of the mandrel, a cylindrical part is rolled - an engine compartment of three layers. The first is made of carbon fabric, and then two layers of fiberglass. This is done in order to improve the heat resistance of the aft hull. During the knurling process, a coloring pigment is added to the resin. Having allowed the resin to polymerize, the mandrel with the wound billet is clamped into a lathe and the outer surface is processed, after which it is cut with a sharp cutter to the desired length - 425 mm. Then the mandrel is slightly heated and the finished body is removed from it. Using this technology, a head fairing 85 mm long is also molded. Three balsa frames are attached inside the fairing (for rigidity), after which a ring is glued from below - a connecting sleeve machined from balsa, 16 mm wide. The width of the gluing belt is 4 mm. A loop is fixed in the bottom frame to connect the fairing to the body by means of a suspension thread. The stabilizers (three of them) are cut from 1,1 mm thick balsa veneer, the side surfaces are reinforced with "glass". They are glued end to end to the body. A suspension thread is attached along the gluing line of one of the stabilizers. The brake band has dimensions: 1050x97 mm, material - polygraphic lavsan 0,02 mm thick. Laying - "accordion" with a step of 4 - 5 mm. Originally made by Polish rocket scientists wad. Unlike other athletes, this is not a banal piece of cotton wool or a foam cylinder, but a whole paper structure. Its basis is a tube of writing paper 265 mm long and 10,2 mm in diameter. A paper disk (deaf - without holes) is glued to one end of it, on which a cylinder 30 mm long is "planted". At a distance of 100 mm from the disk, another disk is put on the tube - for stable placement of the wad in the model body. The advantage of this wad design is obvious. Its mass is 1,5 g. It does not allow the model rescue system to go down both at the moment of launch and in flight. This does not change the position of the center of gravity of the model. The preparation of the model for flight occurs in this order. First, the wad is lowered down from above until its lower end appears behind the aft section of the hull. The upper part of the engine is inserted into the wad tube to a width of 2-3 mm, and it is fixed in the engine compartment. Next, the rescue system (brake band or parachute) is laid on top and the head fairing is attached. In flight, after the expelling charge of the MRD is triggered, the energy impulse (explosive wave) is transmitted through the tube (in a small diameter - 10,2 mm) and rests against the wad disk. It moves up and ejects the rescue system from the hull. At the same time, he can fly himself. Author: V.Rozhkov
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