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MODELING
Air combat training model Svetlyachok-2. Tips for a modeller
Directory / Radio control equipment We offer you our air combat model. We teach simple aerobatics on it, arrange the first air combat competitions. To begin with, a few words about the methodology of working with modellers adopted in our club. As a rule, the guys perform the main parts and pre-assembly either at home or in school workshops, of course, according to the drawings provided by the club. The final adjustment of the model elements, assembly, debugging, installation of micromotors and tight fitting of the model are carried out in "Firefly". All this significantly reduces the time for manufacturing models and, as a result, allows holding competitions on new equipment once a month. All members of our club are organized into small teams: as a rule, they include students from the same school or vocational school. With such a team, the guys go to competitions, and applications for them must be signed by the director of the corresponding educational institution. As practice has shown, this contributes to the growth of the mass character of such an interesting sport as aircraft modeling. Now more about the model itself, which we called "Firefly-2". For the wing, we chose a plano-convex profile, which made it possible to reduce the dimensions and use the most affordable materials for manufacturing. The mass of the model with the engine does not exceed 400 g, which allows you to fly it quite steadily even at the nominal engine mode.
A few simple devices made it possible to drastically reduce the number of breakdowns and accidents during rough landings, and increase the survivability of the Firefly. In particular, the traditional ballast loading of the outer wing took the form of a protective bracket made of steel wire Ø 2 mm, securely soldered together and fixed at the end of the wing with threads and glue. The length of the development of the large bracket is 420 mm, the small one is 220 mm. Reverse taper propeller nut; this is necessary to fix a 20 mm long vinyl chloride tube on it. A rubber plug is inserted into the tube, which reliably protects the engine and motor mount from damage. For such a nut, you only have to make a special screwdriver key out of a 3 mm thick steel strip. We use propellers, as a rule, standard, stamped from elastic plastic. Almost all the details of the model, in particular the ribs, motor mount, under-engine bars, liners, scarves, are cut with a jigsaw from dense birch plywood 3-3,5 mm thick. In order for the parts to better perceive external loads, the direction of the fibers of the outer layers of plywood plates must correspond to that shown in Figure 4. In addition to plywood, you will also need pine slats of the following sections: for the trailing edges of the wings - 3,5x10 mm, for the spars 4x4 mm, for the leading edges - 6x6 mm. The "brows" glued along the leading edges of the wing are cut from a plywood strip 15 mm wide or veneer (their thickness is 1-1,5 mm). All wooden parts after processing and mutual adjustment are impregnated with liquid nitro-glue - this increases their strength, moisture resistance, and besides, such a primer increases the reliability of gluing. The frame of the model is most conveniently assembled on a flat plane, the connection of parts is with nitro glue. After its complete drying, all edges and joints are cleaned and safety brackets are attached to the outer wing. The docking of these manufacturers with the wing will be much more reliable if you first wind the ends of the brackets in one layer of thread. With the help of the same thread, the staples are attached to the end rib of the wing. Takeoff model type "Firefly" - with hands. After starting the engine, the mechanic takes hold of the end of the outer wing, inspects the site and, at the command of the pilot, ejects the model, trying to make it move along a line tangent to the flight circle. Before launching, the pilot must take the red condom control stick up and carefully inspect the site. Then, giving the mechanic a command to throw the model into flight, make the first movement of the hand in the course of flight. It is not recommended to “work” with your elbow or hand at the first launches - it is enough to raise and lower the entire outstretched arm. This allows the model to deviate the elevator very smoothly, and thus the novice athlete quickly masters the control techniques. It is best to train on a platform with a soft grass surface that protects models from significant damage. At the inner end of the wing there is a cord wiring bracket - it is bent from steel wire Ø1 mm. The wingtips are cut out of foam and glued to the end ribs. The wing is covered with colored mica paper (using nitro glue) or a thin lavsan film (using BF-2 glue). The model marking consists of the initials of the modeler and a two-digit number - the serial number of the model. The horn and control rocker are made of aluminum sheet 1,5-2 mm thick. Holes for carabiners and traction - Ø2 mm, for pivot (screw) - Ø3 mm. Carabiners are curved from steel wire Ø1 mm, control rod is also wire Ø2 mm. The elevator is cut from a plywood plate 1-2 mm thick. Under the steering horn, it is necessary to cut a narrow slot for the passage of a thread with a needle. After setting the boar in place, "sew" it, coat the joint with glue and reinforce with a strip of nylon fabric. The elevator is hinged on the model with threads No. 10. First, drill holes Ø1 mm along the axis of rotation of the steering wheel.
The fuel tank is soldered from tinplate, the drain and filler pipes are copper pipes with an external Ø3 mm. The tank is connected to the engine with a PVC pipe with an internal hole Ø1,5-2 mm. The design of the tank depends on the type of engine used. If the model is supposed to install an engine with a front gas distributor (through the crankshaft), then it is better to make the tank long and low. When using an engine with a jet on its back wall, the tank will have to be made shorter and taller - this will provide access to the carburetor nozzle. Tank volume - about 20 cm3. This is quite enough for training runs and intra-club competitions. Wooden control handle. After four holes are drilled in it, sand its surface on the sandpaper and cover with nitro varnish. Cover the upper end of the control handle with red enamel. A nylon cord is passed through the holes, as shown in Figure 2, carabiners made of OBC wire Ø 1 - 1,5 mm are fixed at its ends. This type of handle allows you to very accurately set the neutral position of the elevator. After attaching the cords between the carabiners of the control handle and the carabiners on the model, check the entire control system for strength. The easiest way to do this is with a household spring steelyard. The control system must withstand a load of at least 8 kgf. If you are preparing several models for the start at once, carefully make sure that the distances from the axis of the model to the axis of the control handle are the same for all (± 40 mm). Before launching, it is necessary to mark the site - you can do this with bright paint or flags. The latter will require at least 16 pieces. When marking, it is necessary to mark the center of the site - a circle Ø 5-6 m and a circle for the flight of models. Author: A.Marchenko
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