UNDER A PYRAMIDAL SAILS

UNDER A PYRAMIDAL SAILSThe proposed microart class DX-02 is built using the experience of Czech and American athletes, as well as materials of the journal “modelist-Konstruktor” about sailing armed with a pyramid scheme. Its design allows to realize the advantages of this scheme over the traditional in terms of the competition in this popular youth class. The yacht is easy to manufacture, and build it could even by a constructor of ship models with little experience.

The basic building material for the housing is Styrofoam: polystyrene-tion of dense packing melkosortnyj or grade SS-4-40. The benefits of this material — availability, ease of handling and… almost completely unsinkable.
 
The construction of the hull begins with the preparation of the necessary templates of its contours. On thick paper or cardboard are plotted the contours of the body top, side, as well as the contours of cross-sections “2”, “4”, “6”, “8” to control the processing of the workpieces on the proposed technology. If you decide to run the hull in the traditional way (from a set of frames and stringers), you will need a complete set of cross sections in the form of templates and contraband for final control of the shape of the contours.
 
Case not have to be made from a single piece of foam. Quite suitable timber, glued from several pieces. It is better to use joiner or casein glue. Discard PVA glue, otherwise when handling the cloth all the seams will be, and around them formed “failures”.
The foam core of the hull is prepared as follows. Take two pieces of foam and dock along the longitudinal plane of symmetry. A soft pencil mark the position of the plates of the keel and rudder, then sandpaper wrapped around a flat block of wood, selected sites for their installation. The pattern of the side view on the plane of joining of the pieces is applied to the contours of the lateral projection of the nucleus with an allowance of 1.5—2 mm and cut it heated nichrome wire or saw blade of the hacksaw blades. Skin bring the deck surface to the exact contour. Along the entire deck will later be glued in stringer cross section 5 X15 mm, so it is with a knife cut a groove 5×7,5 mm. the Finished half of the body glued together with casein glue, aligning the grooves for the keel) rudder. It remains to lay out the pattern outline of the case from the top and trim excess. After that, the foam core of the hull a rough draft ready.
 
The bow section are cut from bars of soft wood — alder, aspen or basswood, glued along the longitudinal axis with a sheet of 1 mm plywood. Into the foam of the workpiece saw blade blade saw through the groove under the plywood piece. The nasal boss glued with epoxy. Finally it is treated along the contour together with the foam core.
 
General view of the yacht
 
General view of yachts:
1– bow-boss, 2— bonding area (plywood 1.2 mm), 3— Midel’veys (pine 5x 15×800 mm), 4 — bow reinforcement Board (pine 5x15x50 mm), 5 — the gaff rig, 6 — mast, 7 —contour-square, 8 — feed enhancement Board (pine 5x15x50 mm), 9 — transom (plywood 1.2 mm), 10 —wheel, 11 — the direction of gluing paper strips, 12— Kiel, 13 — ballast (lead, tin 800 g), 14 — the mount the mast on deck (2 mm duralumin).
 

 
 
Projection
 
The projection of “housing”. Rooms the theoretical cross sections are consistent with the previous figure.
 
 
 
Adjustable mast
 
Adjustable support mast.
And — strap mounting mast, B — mast lock.

 
 
 
 
Mast Assembly
 
Mast Assembly:
1 — pin (5-mm steel wire), 2 — threads, impregnated with adhesive, 3 — the trunk of the mast 4 — crispity, 5 — supporting washer 6 — force quirk of thread and epoxy, 7 — pin.
 

 
 
 
 
Overall dimensions sailing snap
The total size of the sailing rig.
 
 
The most laborious part of the work — handling a knife and skin the exact contours of contraband “2”, “4” and “6” with respect to the symmetry halves. Then the stern glued with epoxy to the transom 8 and the longitudinal stringer (Midel’veys) and the guys fixing — side housing — rail 5 x 15×50 mm (flush).
 
To obtain a hard and smooth outer surface of the housing are glued together with paper strips. Good newsprint or fine writing. It was cut into strips with a width of 30 mm, smear with carpentry or casein glue and placed under a 30° angle to the longitudinal axis of the model. The edges of the strips must be joined to, and not to lie overlap. When the first layer is completely closed case, on top of placing second, but under an angle of 120°. Once the glue dries, the casing with the sides of the nose wear an old nylon stocking, the excess of which is pulled over the stern and tie with thread. Stocking it plays the role of covering. His coat with glue, allow to dry and then cut off the excess.
 
The keel and the rudder are cut out of 2 mm aluminum or 1.5 mm brass sheet. Before gluing the keel to it fastened lead ballast, moulded from clay or alabaster. The last split is performed in several stages. First wood cut fool in the form of ballast. Then from clay molded partitions on the vertical axis of the connector and the dummy utaplivayut to partition in water mixed with ground alabaster or clay. After the mixture has hardened, the dummy is extracted from the resulting mold halves. The clay wall is removed. The surface of the mold halves smeared with a thin layer of mastic or oil, and again inserted in her ass and poured the remains of the mortar of alabaster or of clay. After the final – I of curing a matrix-form separate and remove the dummy. Halves of the matrix wipe off, removing the remaining separator, and modify a file the slots in the mounting location of the plate keel. At the end of the keel plate drill some holes in which are formed during casting of the jumper, tightly fixing the ballast (the hole diameter is at least 5 — 6 mm).
For young modelers will fit other technology obtaining the ballast cargo of two plates of tin or lead with a thickness of 10-12 mm. Workpiece fastened to the keel with two screws or rivets, and the finished keel with the load and the wheel glued to the hull with epoxy.
 
For finishing the body primed with a layer of bright synthetic enamel or nitro; over the dried enamel is applied a layer of putty which was then sanded cloth, carefully aligning the surface, but not allowing the removal of the coating to the paper layer. After sanding the model again covered with a layer of ground coat enamel. For the final painting we recommend to apply alkyd or nitroemali bright colors to the boat was clearly visible on the surface of the water.
 
The hollow mast is made of four pine slats 3x12x800 mm, laminated in epoxy resin and machined to a round section (to the upper end of its diameter reduced to 6 mm). In the base of the mast glued a rod of wire with a diameter of 5 mm, and the tip — wire of diameter 2 mm. Before that, the ends of the rods wrapped with cotton thread # 10 and coated with epoxy resin. The ends of the mast also wrapped the threads with glue – eating to prevent cracks. After all, the product is coated with nitrocellulose lacquer to a glossy Shine.
 
Crispity and outline-square curvature of the 2-mm steel wire and are connected by soldering. Crispity fastened through the support washer, is sawn from a 2-mm dural sheet and secured to the mast threads impregnated “with epoxy”. The resin is applied so as to form a large fillet between the mast and the washer. Geeks and guys make fishing line or nylon cord. On the case guys attached to the lugs of brass or copper 1.5 mm wire, glued with epoxy resin into the side sections with rvec.
 
The cloth sails are cut out from a thin synthetic fabric with allowance for podvorot and the firmware thread. Allowance of fabric on the “belly” is about 7…9 mm along the length of the lower edge of the sail. For the best aerodynamic qualities of a sail the lower part of the contour is square tighten a thick (50 µm) drafting Mylar film with tape-“Scotch”.
 
How to debug running properties model and sail arms are virtually indistinguishable from previously known. The only thing you need to pay attention to this account of the vector of apparent wind. In connection with the rapidity of the model it is more important than on a conventional yacht snail.
 
S. GORSHKOV, engineer

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