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MODELING
Motor yacht model. Tips for a modeller
Directory / Radio control equipment EX-class ship models differ from many others by a successful combination of ease of manufacture and spectacular appearance. The impressive dimensions and technical equipment of these models provide, as a rule, a decent level of sports competitions and increased entertainment, which attract many fans. In this publication - a twin-engine yacht, in the design of which only available domestic materials are used. The basis of the power set of the hull are stringers - pine slats without knots and pitching 1200x8x8 mm in size. Frames and keel are cut from high quality birch or beech plywood 4 or 5 mm thick. It is recommended to glue all wooden parts of the model only with two-component epoxy EAF glue or industrial resins. The assembly of the frame begins with the joining of the frames with the keel, after which the frame is installed upside down on a flat slipway board. To give the stringers the desired shape, they must be preheated over an electric stove or other heat source. Before flexible slats it is useful to soak in boiling water. The bent stringers in the wet state are temporarily fixed at the points of docking with the frames with a thin soft copper wire. After drying, the slats are finally fixed to the frames with epoxy glue. The assembled frame is cleaned so that the stringers do not protrude beyond the theoretical contours of the hull - of course, taking into account the thickness of the skin. The bottom blanks are cut out of plywood 1,2 mm thick. The position of the fibers of the outer layers of plywood is longitudinal. To avoid mistakes, patterns made of thin cardboard or drawing paper are first adjusted to the frame. On the zygomatic stringer, the glued parts of the bottom are processed with sandpaper. Then, transverse bars of frames, bow and stern bosses cut from linden are glued to the set. In this case, the nasal boss is first sawn in draft (with an allowance), glued in place, and only then it is finally processed. The aft boss is made immediately according to the nominal dimensions. The sides are cut out of plywood 1,5 ... 2 mm thick according to prepared patterns. The drawing shows that in the bow of the model the deck forms a slight rise, and therefore, when fitting and gluing the sides, the frame will have to be removed from the slipway. In this case, special attention should be paid to the symmetry of the case. The sides form zygomatic "pockets" with the bottom, which are filled with putty after assembly. Original zygomatic keels are formed, which have a positive effect on the seaworthiness of the model. In the bow underwater part of the hull, additional form-setting pads made of 1,2 mm plywood are glued. The joints are puttied and sanded flush with the contours of the bottom. It is recommended to use self-made putty - based on epoxy resin with the addition of talc or finely grated sifted chalk.
The specified details are made of pine laths with a section of 5x5 mm. Sheathing (sides, walls and roof) - plywood 1,2 mm thick.
The numbers of the patterns correspond to the positions of the figure "Cabinet design". The entire interior of the body is covered with three layers of two-component parquet varnish. In the aft part, from the bottom side, two through holes are marked and drilled for copper or brass tubes with a diameter of 6 mm and for rudder stocks with a diameter of 4 mm. The rudders themselves are cut from plywood plates 1,2 mm thick. A stock is clamped between these plates, and the edges of the rudders are glued together. The inner cavity is filled with epoxy resin. The cross section of the steering wheel is lenticular, symmetrical. At the free ends of the steering shafts, an M4 thread is cut for the fixing nuts. The surface of the rudders is varnished. The power plant is assembled on the basis of two DC motors of the Mabuchi-380 type with the opposite direction of rotation specified by the manufacturer (this is necessary to compensate for the reactive torque during their operation). The power source is silver-zinc (STSS series) or nickel-cadmium batteries with an operating voltage of 6 ... 8 V and with a total capacity of at least 4,5 ... 5 Ah. Deadwoods are used branded or homemade. Propellers with a diameter of 45 mm - plastic, industrial production, opposite rotation. The motor shafts on the collector side are interconnected by a steel spring (which is used for oil seals), which serves as a speed synchronizer. Electric motors are attached to the motor frame with clamps made of tin or soft sheet duralumin. Deadwood cavities should be filled with grease "Litol" or "Ciatim" using a syringe (it is also necessary to lubricate the rudder shafts). In the aft part of the bottom, the deadwoods are brought out and fixed with kerchiefs made of plywood 5 mm thick. Inside the hull, the exit point of each deadwood is reinforced with strips of fiberglass impregnated with epoxy glue. The deck is made of selected rails with a section of 8x3 mm. Gluing is carried out on a sheet of paper or plastic film. The resulting workpiece is processed with sandpaper on both sides. In the aft part, an overlay made of plywood 1,2 mm thick is glued from below. Then the deck is superimposed on the hull, marked in place and cut out with a small allowance. Next, a hatch is cut out for access to the internal elements of the yacht, which is edged around the perimeter with pine slats or strips of plywood to prevent water from entering the hull. The finished deck is glued to the frame. After the glue has cured, the allowance is removed with sandpaper. Above the nuts for fixing the rudders, two holes with a diameter of 12 mm are drilled for a socket wrench, which are closed with easily removable linden plugs. The entire surface of the deck is neatly covered with four layers of parquet varnish, each layer being sanded with fine sandpaper. The superstructure is made of 1,2 mm plywood. The walls and roof are joined using pine slats with a section of 5x5 mm. Portholes and windows are sealed from the inside with a transparent film 0,3 ... 0,5 mm thick. The superstructure and deckhouse are varnished three times inside and outside. Detailing of superstructures and decks is made of various materials. The antenna on the wheelhouse is cut out of plywood 2 mm thick; cases of side lights (left and right) and wave baffle - made of 1,2 mm plywood; life buoys - made of polystyrene 5 mm thick. Flagpoles are made from pieces of brass or steel wire with a diameter of 2 mm. Bollards, spire, anchors, hawse, searchlight, ship siren are carved from pieces of polystyrene or beech. The railing and handrail are made of a copper tube with a diameter of 3 mm, and an additional crossbar is made of a copper wire with a diameter of 2 mm. Connection method - soldering with GUS-40 solder. Before painting the yacht, the sides and bottom are primed three or four times with nitro-lacquer and dry-treated with a fine sandpaper. Coloring is carried out with nitro or synthetic enamels in 4 ... 6 layers with intermediate drying. The last layer is finishing and should remain glossy. It is useful to add 30 ... 35% parquet varnish to nitro enamels to obtain a good gloss and increase water resistance. All small parts are painted separately and fastened in place ready-made. The layout of the paint colors is as follows: white - sides above the waterline, superstructure and wheelhouse, antenna, half of the life buoys, searchlight, fence; green - bottom and sides below the waterline, starboard side light; red - waterline, part of life buoys, left side light, end perimeter of the deck; black - hawse, bollards, spire, wave baffle. Before launching, it is necessary to install a power switch for electric motors on the model. During test runs, a cord or fishing line 70 ... 85 m long is tied to its lever. After passing the allotted distance with a jerk of the cord, the engines stop and the model is pulled to the shore. Debugging the course - only on calm deep water. In shallow water, bottom eddies and currents strongly affect. The straightness of the course is adjusted by changing the position of the rudders. At competitions, the skill of a modeller lies in the ability to take into account the influence of wind and waves when calculating the trajectory of movement over a distance. In any situation, it is better not to correct the position of the rudders on a well-adjusted model, and all "aiming" corrections related to weather and waves should be carried out solely by proactively - moving the ship's bow to the appropriate angle away from the middle of the finish "gate". On the proposed model, it is quite possible to install a two-channel radio equipment for controlling the rudders and engine speeds. The motor yacht will follow a figured course with great success. Happy sailing and seven feet under the keel! Author: V.Antipov
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