Hiking, water competitions, fishing! How many unforgettable summer days and winter dreams are connected with them! But after all, in order for these dreams to come true, first of all you need to have some kind of vessel. Here at least this catamaran with the tempting name “Rest”!
Of course, you know that a catamaran is a vessel consisting of two hulls connected by a platform or superstructure to accommodate passengers and cargo. There are catamarans motor, sailing and rowing. Depending on the mode of movement on the water catamarans are divided into displacement and gliding. There are vessels consisting of three hulls connected by one common platform. They are called trimarans. In general, ships with several hulls connected to each other are called polymarans (from the word “poly” ?? many).
Catamaran “Rest” ?? motor, gliding. With a relatively small size, the hull has a rather high side, protecting the driver and passengers from splashing water and ensuring safe navigation in “fresh” weather. The durable hull makes it possible to operate the catamaran at high speeds, with outboard engines “Moscow” and engines of greater power.
The catamaran hull consists of two symmetrical floats connected by a bridge, forming one common platform with the sides of the floats 2.66 meters long and 1.63 meters wide, on which are placed five seats. The bottom of the V-shaped floats, to the stern, smoothly passes into an almost flat area, providing gliding along the surface of the water. The sides of the floats in the nose have a small camber, which serves to repel splashes as it moves along the agitated surface of the water. In the stern of the board a few fill up. This was done to ensure that the water coming out from under the bottom did not wring the sides and did not inhibit the movement of the catamaran. Low wings are made on the deck in the stern, protecting the stern with motors from splashes. Lower platform surface ?? flat, gradually descending to the stern, and the height of the lumen under the platform is chosen so that when the catamaran moves, the platform does not touch the water.
The catamaran hull is divided into three compartments.
The bow section of both floats is used as a forepeak, where different property is required for swimming. In the middle of the hull is a cockpit, designed for five people. The two front seats are spaced to the sides, at the stern wall ?? one triple sofa. The seats are made of foam, covered with colored texin. The backs of the front seats are adjacent boxes designed to store food and luggage. The bottom part of the cockpit is covered with vents of waterproof plywood, in the front part there is a wide windshield made of plexiglass with metal edging for fastening the awning. On the windshield at the sides are mounted running distinctive lights (green on the right side, red on the left side) and swing out lights. In the middle part of the glass top fire is installed. Navigation lights and swing lights are powered by a motorcycle-type battery installed in a special box in the aft of the cockpit under the seat of the left float.
On the catamaran, you can install an awning of plastic film, stretched on the windshield, and two U-shaped folding frame of duralumin tubes. The frames are installed in the sockets on the inside of the cockpit. On the left side in the front of the cockpit is the driver’s post. On the control panel, a steering column with a steering wheel of an automobile type is mounted, connected with the outboard motors through the gear-drive transmission, the handle of the “reverse ?? gas “manometer ?? speed indicator, converted from pressure kg / cm 2 to speed readings in km / h, and toggle switches. A nest for the flag is also provided here. On the front panel there is also a place for watches and brackets for fastening a portable battery receiver of the “Atmosphere-2” type.
Two outboard engines “Moscow” are hung on transom floats, fuel tanks are installed below the deck. The motors are connected by remote control of the reverse and gas with the driver’s station with the help of rigid rods and cables in a flexible metal sheath.
On the catamaran “Rest” can be installed and stationary engines of low weight, for example from motorcycles “K-750”, “M-72”, “M-61” or from the car “Zaporozhets”. But it is necessary to make a special foundation. In order for the propeller to work under normal conditions, the engine mounted on the platform in front of the aft seats should be lowered along with the platform bottom, and the propeller shaft bracket should be installed under the so-called anti-cavitation plate. Any stationary engine must be equipped with a remote control of the reverse and gas from the driver’s station.
For towing and mooring of the catamaran on the deck in the nasal tips of the floats there are two curved eyes with carbines that prevent the tugs from slipping. In the aft part of the transom floats are aluminum handles that serve to carry the catamaran, mooring, as well as for fastening it when transported by car or trolley.
The catamaran hull is mainly made of pine. The keel with a section of 25 X 50 mm is joined to the bow “on the mustache” without additional fastenings. The stem is glued out of 4 pine and 2 oak planks with a cross section of 8 X 80 mm on a special template. Zygomatic stringers and fenders ?? single section (20 X 30 mm), bottom stringers ?? 18 x 30 mm, onboard ?? 15 x 30 mm. Underdeck (12 X 15 mm) and longitudinal (15 X 30 mm) ties of the platform are also made of pine.
The frames are assembled from pine billets with a cross section of 40 X 18 and 50 X 18 mm, with the frame frames of floats being assembled from billets with a cross section of 40 X 18 mm, and the internal RIB of the float and the transverse beam of the bridge ?? from bars with a section of 50 X 18 mm. All the elements of the frames are interconnected into the joint and fastened with plywood knits 3 mm thick on the glue “VIAM-B3”, with the pressing of nails 1.5 X 20 mm. The frames of the front and rear seats are made of pine blanks with plywood knits and are assembled during installation of the equipment on glue “VIAM-B3”.
Then the plywood seat shields with foam rubber covered with texinovite are installed on the frame. Behind the front seats are mounted luggage boxes, the frame of which is assembled from pine blanks with a cross section of 20 X 30 mm and is sheathed with 3 mm thick plywood. A plywood cover with a thickness of 6-8 mm is installed on top of the loop, which serves simultaneously as a table. Inside the cockpit, along the deck, a 3-mm ply coaming coaming is installed on screws of 3 X 15 mm in size, which is covered by an ash panel from the side of the deck along the perimeter. The front panel is made of plywood 8 mm thick and attached to the glue with screws to the beams using wooden bosses.
For the hull shell used BS plywood. The bottom of the floats and the flooring platform are made of plywood 5 mm thick. The sides, deck and cladding of the platform are sewn with plywood 4 mm thick, the bulwark has a thickness of 3 mm. On top of the cladding along the groove of the board with a deck is set an ash flange with a cross section of 25 X 30 mm. The catamaran set and lining from the inside are covered twice with hot drying oil and grounded with red lead or ground No. 138А. Seatbacks, case casing, front panel, cockpit coamings, layout and shoulders are coated with walnut stain and then varnished three times with an oily lacquer paint 6c. Outside, the casing at the joints for better waterproofing is glued over with strips of glass fabric on epoxy glue and painted with pentaphthalic paints.
It should be noted that the design of the case is designed for two engines “Moscow”. The use of more powerful outboard or stationary motors (up to 2 X 20 HP) is possible, but it is necessary to increase the thickness of the bottom cladding of the floats to 6 mm and introduce additional transom mounts. No other changes are required.
We start with a breakdown of the plaza.
On. plywood board 2 m wide and 0.8 m high draw a vertical line ?? The axis of symmetry of the hull ?? and denote it by the letters DP (diametral plane). At a distance of 625 mm on each side, parallel to the DP, we carry out the symmetry axes of the floats (DP of the floats), breaking a grid around them with a cell size of 100 X 100 mm and observing the strict perpendicularity of the intersections of the lines. On these grids, according to the table of the ordinates and the theoretical drawing, we draw out life-size frames, inflicting at the same time the width of the elements of the set and tracing all the brackets on the design drawing. From the plaza, we remove the full-sized knolls form, transfer them to plywood and cut it out. Putting blanks to the plaza, we mark and cut off by size all the elements: beams, ribs, florimbers, related to the same frame. Then we place all the elements on the square around the perimeter of each frame and, putting the knits in the right places, fasten these elements together with several nails. Then, turning the frame, set the knits on the other side. So we collect all the other frames. After assembling the frames, glue them together with “VIAM-B3” glue, observing the coincidence of their contours with the drawing on the plaza.
Knits to them we glue with glue nails 1.5 X 20 mm. After this, the frames must be dried at a temperature of 20 ° C or higher during the day. At lower temperatures, the exposure time is increased.
The stem is glued on a special template, the design of which is shown in the figure. Harvested slats are smeared with glue and are successively laid one on top of the other in a “package.” Then the “package” is placed on the edge and is attracted to the template by clamps. In this case, the oak slats when bending the “package” should be on the side of the template. Pressing the “package” is necessary until it repeats completely the form of the template. After that, the “package” should be dried. When the workpiece is dry, it is removed from the template, the glue leaks are cleaved and using a plane to achieve a flat surface and a width corresponding to the dimensions in the drawings. The width of the laths in connection with this need to take a slightly larger width of the stem.
By preparing the parts for the stem and keel, you can proceed to their connection, adjusting the “mustache” so that a fracture does not form at the junction and one continuous smooth line is obtained. After fitting the “usa”, the keel with the stem is glued together and compressed with clamps. “Us” at the joined parts need to be planed at a length equal to their tenfold thickness. Such a connection does not require additional fastening and is held securely with one glue. To the tabs (two keels with stems) on the glue attached front bosses. After that, you can begin to manufacture the stocks.
The building berth is made of two planks 40-50 mm thick with edges along the line of the bend of the keel. These stocks beams are installed strictly in parallel, at a given distance from each other and securely fastened into a single unit. Then, bookmarks are installed on the slipways, which are temporarily fixed in the desired position, and the frames are marked according to the theoretical drawing. The points of attachment of the zygomatic stringers are also marked on the stems. In the frames are cutouts for the keel to the required depth. Frames 1,2 and 3 are placed in the nose from the marking line, and 4, 5, 6, 7 and 8 ?? in the stern. When hull hull excess wood on the frames can be removed with the appropriate chamfer. Frames are attached to the keel on the glue with screws 4 X 40 mm (two pieces per frame), turning the screws from the side of the keel. After installation of the frames should be fixed nasal bridge boss. All frames are connected temporarily with each other by longitudinal slats and proceed to the installation of the fender bars, fixing them on the glue and screws 3X30 mm in the cutouts of the frames, specially made to fit the flank bars. Then, in the same way, the zygomatic and bottom stringers, the longitudinal links of the bridge, the underdeck ties and the side stringers are installed.
Having checked the reliability of the fastening of the longitudinal elements of the hull, you can begin the small piece. Malku the body with a planer, periodically applying a flexible rail to the place to be cut and achieving a smooth bend of the contours without gaps and protrusions. The control rail must be taken so long that it lays at the same time at least three frames.
Having grinded the hull, proceed to its trim. First of all sheathe boards with plywood sheets. For each side cut out the pre-cut plywood, adjusting the joints so that they are located on the frames. The docking of the skin sheets is done by gluing them “with a whisker” with a length of at least 50-55 mm. “Us” on the casing is positioned so that it is directed against: soda catamaran. After the trimming of the panels, the joints are covered with a “mustache” and smeared with “VIAM-B3” glue. Gently overlapping each other, the sheets are folded into a bag, fitting the joints. Then, at the joints at the top and bottom, they impose even bars and tighten them with clamps on both sides, achieving the necessary fitting of glued plywood. The dried package of panels of the skin is separated, cleaned of excess glue and set on the sides, seeking the appropriate cutting position. After that, the inside outlines the set with a pencil on the casing, remove it and at the points of contact with the set drill holes for screws at equal distances. After smearing the board with glue, put the trim in place, evenly tightening 3X15 mm screws from the middle to the bow and stern.
First, screws are seldom placed, achieving only the fit of the skin over the entire surface to be glued, and then they add intermediate screws. This is done so that a thin film of glue applied to the wood begins to harden after the skin is mainly drawn to the set. In the same way, the bottom plating is prepared and installed in place. After sheeting the hull, the hull acquires sufficient rigidity, so it can be removed from the pile and turned over.
Sheathing of the bulwark and deck is made on glue with pressing in with small nails. It is quite enough for their reliable fastening. Moreover, the joints of the cladding sheets on the deck can be connected on the beams edge to edge. After the hull paneling has been completed, excess plywood has been removed, glue drips have been cleaned, and the gluing of the cladding is started with fiberglass strips and the hull primer. The body outside and inside is treated with soil No. 138A with preliminary coating with hot drying oil. Then, the seat frames, luggage boxes, cockpit coamings are made and installed on the seats, the front panel is varnished and mounted, customized in place and ground on the slang. The latter are mounted steering and remote control motors and electrical wiring.
To paint the body well with colors of contrasting colors, but not more than two colors. Pre-body is recommended to carefully treat the emery cloth. Paint preferably at least three times.
After painting the case, a windshield, mooring handles, eyes and all other equipment parts are installed, sewn and fitted to the seat position, a lacquered layout and shoulder beads are put.
Before the first exit, you must carefully check the steering, adjust the remote control motors. It is better to lower the catamaran with your nose, since during the stern descent the water can reach the hull through cuts in the transom. Start the engines, warm them up at low speed and go out on the first voyage for running trials. On tests, it is necessary to check everything: the hull, the steering, and the inclusion of the reverse of the motors. If the hull assembly and remote control installation are carried out accurately and accurately, then you will not have to expect any unpleasant complications and a walk on a catamaran will give you great pleasure.
V. BASOV, V. DEMCHENKO. Fig. D. KHITROVA
MAIN DIMENSIONS AND ELEMENTS
Maximum length (m) ?? 4,63 Width greatest (m) ?? 1.91 Bead height: in the nose (m) ?? 0.60 in feed (m) ?? 0.46 Displacement of a fully equipped catamaran (pleasure version) with 4 people. (kg) ?? 560 Body weight with equipment (without motors and tanks) ?? 140 Rated speed with 4 people. and two engines “Moscow” (km / h) ?? 29-30 Maximum passenger capacity ?? 5 people