|
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese|
MODELING
Corrugated cardboard with a motor. Tips for a modeler
Directory / Radio control equipment Not so long ago, the magazine "Modeler-Constructor" talked about the simplest model of a glider, made of ordinary corrugated cardboard packaging - a material, although not an aircraft model, but quite durable, rigid and light. By the way, a square meter of corrugated cardboard with a thickness of 3 mm has a mass of only 400 g, respectively, the density of this material is only 0,13 g / cm3! Experiments have shown that durable and lightweight corrugated cardboard is quite suitable for creating flying models. It is only necessary when cutting and processing corrugated cardboard to take into account some of its features and use a cutter knife sharpened literally to razor sharpness, otherwise the cut lines turn out to be torn. When designing and manufacturing the simplest models, several specific design techniques for working with corrugated cardboard have been developed. Thus, it turned out that the rather high rigidity of this material makes it possible to create spatial elements of models from it with virtually no internal set. In particular, the fuselages and wings, after gluing, acquired quite sufficient strength and rigidity both in bending and in torsion. Corrugated cardboard has another feature due to its cellular structure - this is the difficulty of joining the panels cut out of it. However, in the process of creating models, a fairly simple method was developed for this. It consists in the preliminary edging of the ends of these panels with miniature channels made of thick drawing paper. First, a pattern of this channel is carefully marked on the workpiece - for corrugated cardboard 3 mm thick, the total strip width will be 9 mm, the width of the profile shelves will be 3 mm each. Then, with a sharp joint knife, shallow (approximately half the thickness of the paper) cuts are made along the two inner lines of the pattern, and only after that a 9-mm strip is cut off from the sheet of paper and bent along the cuts in the form of a channel. Next, the end of the panel and the inside of the "channel" are smeared with glue - assembly "liquid nails" or clerical PVA, after which the edging is fixed on the end of the panel with ordinary clerical pins until the glue dries. Finished panels are joined with the same glue - the connection is quite strong. So, we present you another, this time - a more complex aircraft, made almost entirely of corrugated cardboard. This is a cord model of an aircraft with a KMD-2,5 engine, which is a high-wing model of a classic design with a straight wing.
The fuselage of the model consists of two corrugated cardboard sidewalls, top and bottom panels, as well as a motor mount made of 10 mm plywood. In addition to these basic parts for the fuselage, you will also need front and rear wing supports and a landing gear carved from basswood. The rear fuselage lug is also made of linden. The production of the fuselage begins with the preparation of corrugated board panels - side, top and bottom. It should be noted that the side panels must be exactly the same - this can be achieved if, after marking the contour of the panel on a sheet of corrugated cardboard, transfer the coordinates of its corners to another sheet with a needle. As mentioned above, corrugated cardboard should be cut with a sharpened joint knife using a ruler. You should first practice - the knife should be oriented so that the cut plane is perpendicular to the plane of the sheet, and the corrugated cardboard should be cut with two or three sliding movements of the knife. If there are no torn corrugations or "noodles" from repeated knife movements in the cut plane, this will mean that the work has been done as it should. After preparing the fuselage panels, it is necessary to edge their ends with "channels" bent from strips of drawing paper, as already described above. When assembling the fuselage, it should be borne in mind that the front and rear wing supports, as well as the base of the landing gear, are fixed with glue in the slots in the sidewalls. First, these wooden parts (including the motor mount) are installed on one of the sidewalls, and only then the second side panel is docked in place. At the end of the assembly work, the top and bottom panels are glued. In order to ensure the perpendicularity of the fuselage panels, it is recommended to keep the adhesive in the simplest fixture until the adhesive is cured - the same was used earlier when edging the panels. The tail unit is also made of corrugated cardboard. The blanks for the keel and stabilizer are edged with paper profiles - their shape is shown in our drawings. The leading edge trims are best bent and trimmed with a 3mm plywood strip with a rounded long edge. The edging of the rear edges of the keel and elevator is made with a double-folded strip of drawing paper; the remaining edges are edged with paper "channels". The elevator is mounted on the horizontal tail with the help of figure-eight loops made of nylon thread. The wing of the model is straight, with a flat-convex profile, its relative thickness is 13,3 percent (20 mm). The use of corrugated cardboard makes it possible to implement a rib-free wing scheme - the shape of the profile is supported only by two end and two central ribs at the junction of the wing and fuselage. If necessary, you can install one more corrugated cardboard rib in the middle of each half-wing.
The top panel of the wing should be convex, and to make it so, along the front inner part of the corrugated board blank, a smooth plastic rod (for example, a toothbrush handle) should be pressed through several parallel recesses, placing them between adjacent corrugations. The workpiece prepared in this way will easily bend in the intended places. Finally, the panel is edged with paper channels. Wooden embedded parts (docking nodes and the base of the control rocker) are first fixed with glue in the slots on the lower wing panel; glue fixed on the bottom panel and ribs. A lead weight of 25 g is fixed near the end rib of the right (outer) wing. Next, the ribs and embedded parts are smeared with glue, and the bottom panel prepared in this way is covered with the top one, after which the resulting "sandwich" is attracted by rubber bands to a smooth smooth board until the glue is completely cured. It remains to fix the front and rear edges of the wing from pine slats - and the wing is ready. Chassis model - spring type, and the spring is made of sheet duralumin 2,5 mm thick. Wheels - plastic, rubberized (from a child's toy), with a diameter of 40 mm, they are attached to the spring with M3 bolts and nuts. The rocking chair is also made of duralumin - from a strip 2 mm thick. The control rod is made of a duralumin knitting needle with a diameter of 3 mm - its ends are flattened and holes with a diameter of 2,2 mm are drilled in them. The elevator horn is made of a piece of steel wire with a diameter of 2 mm, bent in the form of the letter "G", on the horizontal and vertical parts of which thread M2 is cut. To install the boar on the steering wheel, a lime bushing with a diameter of 10 mm with an axial 2 mm hole is glued into the latter; the horn is fastened to the steering wheel with two nuts, the nuts are fixed from unscrewing with a drop of nitro paint. The engine is closed by a hood glued from fiberglass and epoxy resin on a foam blank. To prevent the shell from sticking to the foam, the blank is insulated with an ultra-thin cling film before work. The fuel tank with a capacity of about 70 mm is soldered from 0,3 mm thick tinplate. Three copper tubes are soldered into the tank - filling, draining and engine power tube. It should be noted that the finished tank must be installed in the motor mount before it is glued into the fuselage. It should be noted that corrugated cardboard is very hygroscopic, therefore, after assembly, the wing and fuselage must be painted with two layers of car enamel. The corrugated cardboard model turned out to be light and volatile. I must say that the significant rigidity of this lightweight material sometimes leads to breakage of the wing or plumage during hard landings. Probably, in the next models it will be necessary to change the method of attaching the wing to the fuselage - fix it not with screws, but with rubber rings on wooden pins. Author: I.Mnevnik
▪ Silencer for model aircraft engine
A New Way to Control and Manipulate Optical Signals
05.05.2024 Primium Seneca keyboard
05.05.2024 The world's tallest astronomical observatory opened
04.05.2024
▪ Restoring vision with wireless implants ▪ Lifetime charging for Tesla electric vehicles
▪ section of the website Experiments in Physics. Selection of articles ▪ article Votes are weighed, not counted. Popular expression ▪ article How Do Archaeologists Know What They're Finding? Detailed answer ▪ article Master-receiver service station. Job description ▪ article Dutch lacquer Elemi for oil paintings. Simple recipes and tips
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua |
We recommend interesting articles Section 
See other articles Section 
Latest news of science and technology, new electronics:
All languages of this page