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MODELING
Training cord aircraft model. Tips for a modeller
Directory / Radio control equipment This model has been successfully "replicated" by modellers for many years. The secret of its popularity lies in its simplicity of design and good flying qualities. And even despite the invariability of the dimensions of the "serial" model, micromotors with a working volume of 2,5 to 4 cm3 in compression and incandescent versions were installed on its various copies. But the most commonly used was the well-known KMD-2,5, equipped with a propeller with a diameter of 220x120 mm. The length of the cords commonly used for launches is close to the standard value of -16 meters. For the manufacture of model parts, non-deficient materials are mainly used. The construction of this aircraft begins with the fuselage. As a blank, a flat board made of aspen, linden, alder, poplar or non-resinous spruce is suitable for him. The side surfaces of the board must be sanded or chipped clean. The thickness of the workpiece after processing should be within 6-7 mm. On one of its sides, the contours of the future fuselage are applied with a pencil, after which the excess material is cut off. Then they cut out a relief window in the tail section and a cutout for the engine crankcase. Two identical blanks are cut out of millimetric plywood for sheathing the forward fuselage (in the drawing, their contours are indicated by white triangles). These plywood parts are glued to the right and left of the fuselage with epoxy. While the glue is polymerizing, motor mount bars are cut out of beech, hornbeam or ash. They can also be glued to the fuselage with epoxy or PVA glue. Spacers made of pieces of rail with a cross section of 6x3 mm are glued into the window to facilitate the tail section. The keel and false keel are cut out of 1,2 mm birch plywood or 3 mm thick plywood from fruit boxes (it is light, almost white, easy to saw and skin; presumably it is made of aspen veneer on CMC-type glue). From the same light aspen plywood, a stabilizer and a "frame" are cut out, forming the frame of the elevator. In this "frame" after its processing, it will also be necessary to glue ribs-spacers made of pine lath with a section of 4x3 mm. Of course, if you can't find lightweight aspen plywood from fruit crates, other materials will work for the horizontal tail. So, the stabilizer can be made from a linden or aspen plate with a thickness of 3 - 3,5 mm or a balsa plate with a thickness of about 4 mm. The elevator is easy to perform typesetting. Pine slats 8x3 mm will go to the leading edge, 4x3 mm for the trailing edge and rib-struts.
The easiest way is to make the elevator, if possible, from a balsa plate 4 mm thick (of course, without sawing out the relief windows). A groove is made in the tail section of the fuselage for the finished stabilizer. In the finished parts of the horizontal plumage with a thin drill or a hardened steel wire rod with a diameter of 1-1,2 mm, sharpened for a tetrahedron, three or four holes are drilled for the hinge hinges. Their location is shown in the drawing. The loops themselves are formed by weaving a strong nylon or lavsan thread (the use of fishing line is unacceptable). Weaving is performed in the form of "eight". The finished vertical plumage and stabilizer are varnished with one or two layers of nitro-lacquer, after which these parts are painted with NTs brand nitro enamels. The elevator (if it is not all-balsa) is covered with a lavsan film 25 microns thick. The same film or pieces of mica paper on nitro-lacquer are sheathed in the opening of the relief window in the rear fuselage. After installing the wing, to protect the empennage and fuselage (especially the motor mount), we recommend covering their surfaces with a two-component parquet varnish. For the model on which the micromotor with glow ignition will be installed, such varnishing is obligatory. The cockpit canopy can be made from any suitable material. To reduce weight, we use a transparent polymer film 0,3 - 0,5 mm thick, from which a flat figured "box" of the lantern is glued together. For simplicity, it is permissible to cut out a flat outline of the canopy from thin plywood, painting it before gluing it to the fuselage. Controls (rocking chair and hog) - purchased or homemade. The rocking chair is easy to cut out of a duralumin plate (not thinner than 1,5 mm). A good steering horn is obtained from the corner of a plastic box (for example, from a KMD pallet). The horn mount consists of two M2 screws. The rod connecting the rocker and the elevator is bent from a steel spoke with a diameter of 1,8 - 2 mm or a duralumin with a diameter of 2,5 - 3 mm. The axis of the rocking chair is made of steel wire with a diameter of 2,5 - 3 mm. The fuel tank is soldered from "white" (tinned) tin. For its reliable fastening from the inside, a steel screw or M3x14 bolt is soldered into the side wall (still at the stage of bending the tin pattern). For drainage and power supply of the engine, copper or brass tubes with a diameter of 3 mm are used. When soldering, acid (zinc chloride) and POS-40 type solder are used. Note that it is most convenient to pierce the holes for the tubes in the tank with a homemade awl made of OBC wire with a diameter of 3 mm. Such a tool makes even and accurate holes in diameter. In this case, a flanging is formed on the tin, which increases the reliability of soldering.
Wing - a typical type-setting design. To assemble its frame, you will need 10 ribs and 12 spouts, sawn from 1,2 mm plywood, and 4 ribs from aspen plywood 3 mm thick (for the center section and console ends). Sections of the longitudinal elements of the wing are shown in the drawings. The center section has a double-sided lining of 1,2 mm thick plywood. In the central part of the wing and at the end ribs, a wall of 3 mm aspen plywood is mounted between the flanges of the spar. At the end of the outer part of the wing, a compensating weight of 15–20 g is glued. The connection of the end ribs with the edges is reinforced with plywood scarves. The way to install the rocking chair on a figured bar, glued between the shelves of the spar, is shown in the figures. The finished wing frame is covered with lavsan film or mica paper. The wing is glued into the fuselage already in a completely finished form. After numerous experiments on the selection of adhesives for this operation, the connection made on epoxy resin was recognized as the most reliable and durable. Before the first flights, it is useful to check the wing for the absence of twist in the horizontal plane, the position of the center of gravity of the model with the motor installed, as well as the magnitude and symmetry of the up and down elevator deflection angles. Experience has shown that the maximum angle of deflection to one side should not exceed 30°. Of the serial plastic screws, provided that KMD-2,5 is used, the most suitable is "Thermik" with a size of 230x120 mm. Author: V.Viktorchuk
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