HYDROCORT MUSTANG | MODEL CONSTRUCTION

It was called hydrocardon, although it is more like a kind of water motorcycle. Built is sports microsode the Donetsk regional station of young technicians in the circle of “Small shipbuilding.” As reported in the editorial of the Director of the station N. Vladimir Vasilyev, the club celebrates this year its fifteenth anniversary. Initially, in the classroom young engineers studied the structure and purpose of a variety of sports and pleasure craft, have developed a new design .mostly motor boats. The work aroused great interest guys, but I felt that something still was missing. It soon became clear that the young “shipbuilders” I wanted not only to create a motor court, but also to experience them and more — to compete: whose machine was faster, so, technically perfect.

For these purposes it was required simple in construction, the original scheme and safe on the go microcode that can satisfy the thirst of the boys to race on the water. I wanted to find the option closest to the capabilities and age of the young shipbuilders. This design became hydrocort.

The first samples were created ten years ago. They immediately showed that the search direction chosen. Microcode unexpected way combines the attractive quality of motorcycle, scooter and jet skis: rider sat astride and managed the steering wheel, as the rider, while the case microsun resembled a scooter, and bends almost up to the edge of the water ski. From sample to sample improved the overall layout of the remote control system an outboard motor, the shape of the bottom, which largely depended on the driving performance of microsun.

In 1973 was held the first competition, which was attended by 10 teams from four cities of Donetsk region. So there’s a new kind of water-motor sport — hydrocutting. Its emergence was supported by our magazine, published the description and drawings hydrocort, diagrams of trails for competition and approximate rules are developed at the Donetsk oblsud. These materials caused a great resonance: the address of the station came a lot of letters from groups and individual enthusiasts of technical creativity.

“Hydrocutting as a sport, — says N. Vladimir Vasiliev, — in our area has become quite firmly in the lives of many collectives of children’s technical creativity. Last year we held the eighth regional competition among schoolchildren”.

Today, on the basis of urban and regional stations of young technicians working 16 groups of young gidrotartrata. This means that technical continues to search for the best design of unusual sports microsun. More than 10 types hidrocharme developed over the period from 1972 to 1980. Offering one of them to our readers, we hope that the publication will further promote hydrocortone is an interesting area of technological creativity and exciting competitions PA water, and the initial class training of skippers and sailors of small boats.

Fig. 1. Hydrocort “Mustang”:

1 — body, 2 box seats, 3 — seat, 4 — fuel tank 5 — knize, 6 — roller, 7 — rotary fixture, 8 — engine, 9 — cable bracket-gas, 10 — transom, 11 — turn cable, 12 — throttle, 13 — emergency switch 14 — the wheel 15 — steering shaft, 16 — trim ring, 17 drum, 18 — emphasis of the shaft, 19 — handle.

The Mustang is a sports boat with the hull lines “deep “V” and flat part of the bottom. In the draft went to the principle of hydrolyze used in the design of the widely known boat “Sea horse” by William Fox. Such an easy ship rises on a wave and at the same time not jumping out of the water even at very high speeds, as long and narrow skis are not very sensitive to changes of angle of attack, relatively gently receives the load, and the force of hitting the wave she is relatively small.

Hydrocort Mustang speeds up to 50 km/h. It is easy to control, has small dimensions and weight (about 40 kg), can be used not only for sports but also for an exciting holiday on the water.

HOUSING MANUFACTURER

Start building hidrocharme need with frames. Their sizes from table blazovich ordinates are transferred onto graph paper; each of the frames is drawn in full size. Then the picture is transferred onto cardboard or heavy paper — get templates.

These templates are laid out and three of the frame hydrocort. The first is cut out of plywood with a thickness of 4 mm, the binding of it is made of slats 20X30 mm, attached with screws and epoxy. The second and third frames, full of pine boards with a thickness of respectively 15 and 20 mm.

Ready-made frames are cut and spaced grooves for installation of stringers and keel. They go through every 150 mm from the median plane. All the longitudinal ribs and the lining Board are made of straight grained pine. Deck stringers 6 pieces with cross section of 15X15 mm. the same size at the bottom of the stringers, which should be held under longitudinal planing steps are laid on the finished case. For sheathing Board used a pine plank 15X50 mm, and for keel — section 20X40 mm.

Transom Board does not have to be an extruded one piece. It can be dialed from pine sticks section 30X40 mm and covered on both sides with plywood 4 mm thick, screws and epoxy resin. The dimensions of the transom plate 38X290X380 mm.

To build the frame of the case will need a slipway, which is made of boards section 30X200 mm. It is a rectangular box measuring 400 mm X2000, which is better set on the table or gantry for ease of operation. Using a level on the slipway to discourage the line of the deck: it must be no more than 150 mm from the bottom edge. This line marks space and cut the grooves for the frames. Further, here, mark the line of the DP and pull the steel string that DP oriented risks of all frames (keeping in mind that hydrocort going up the keel).

The first frame is attached to the end of the bench. Also perpendicular to the line of the deck installed and the second, and the transom is at an angle of 10° thereto.

To the frames on the screws and epoxy to fasten the stiffeners: bottom stringers, keel, fairing the side.

After one day, the set is removed from the pile, and further the Assembly is hydrocort down the keel on a flat table in sequence. Initially set on the screws and epoxy the deck stringers; their length is limited to the first frame. To impart the desired curvature of the bow hydrocort plywood 4 mm thick mold made. To the upper edge on the nails Usagi and resin strap, attach two 20X20 mm; they serve for the attachment of plywood sheathing. To bend at the farm patterns, they make cuts one-third of the thickness. On the side facing to the first frame, straps slightly produced so as to be mounted on the frame what on it in the area of DP is marked and cut by a groove; the lower edge of the patterns cut into the keel and fastened with screws on the resin.

The free ends of the bottom stringers and the hull sides are fixed by means of pine bar 20Х50Х400 mm. He, in turn, symmetrically cut into a pattern and fastened by screws on the resin to the keel and groove patterns. The face of the bar having a width of 50 mm, should be at the level of the deck.

Transom plate is attached using four M8 bolts and epoxy resin. To increase the rigidity of the transom we need to make cnico — triangle of a pine bar 40 mm thick with sides: AB = 300 mm, BC = 200 mm, AC = 400 mm. It is sheathed on both sides with plywood 4 mm thick on the screws and resin. Side sun kniza by a screw, and resin attached to the keel, and the side AB is to the plate.

After preparation of the skeleton of the body, one can start the casing. For this purpose, plywood thickness of 4 mm. should Start from the bottom. Each sheet of the perimeter is laid a strip of fiberglass on the resin — to create a seal, the fastening of the sheet — screws, nails Usagi, also on pitch.

The bottom is sheathed in the following manner. First slanted areas, then flat; the sheet for it to be 80 mm wider than the site itself. If there is no right size of plywood separate sheets are joined to the resin edges “on us” and riveted copper nails.

Before proceeding to the deck plating and the nose of hydrocort, you need to glue resin on the inside all the joints, and then another and the strips of fiberglass. After drying, the entire inner surface cover with a waterproof varnish. For easy carry attach with the M6 bolts three handles: two to the transom, one — bar patterns.

Deck plating is done with plywood 4 mm thick for the same technology as the bottom. The inner plane of each sheet pre-coated with a waterproof varnish, excluding the space for the set. For knize cut groove, which, after securing the plywood is glued with fiberglass.

Trim fore end of the two sheets of plywood with a thickness of 4 mm. Each of these parts is attached to edges of strips of patterns to the first frame to the sidewall and bars embedded in the mold. The technology is the same that of the bottom and deck.

Fig. 2. Theoretical drawing hydrocort (see also table).

When the entire body is ready, you can take on the manufacture of the box-seat. Plywood 4 mm thick sidewall made, and of pine sticks 20X40 mm frame size 150X290 mm, which screws with the resin is attached to the first frame. In the frame in the transom plate grooves are cut in such a way that they can be stacked two strips 20X20 mm, the upper bound which would be at a height of 150 mm from the deck. The distance between the outer faces of these strips should match the width of the transom plate.

Just below these straps are attached to the deck are the same — turns out the box seats, which are screwed on the screws the plywood sidewall. In the place where the box height goes from 150 mm to 230 mm, a jumper from the pine bar. Another jumper is made of plywood 10X200X290 mm — will serve also to impart stiffness, and as a support shaft of the steering wheel.

Upon completion of all Assembly work, the housing must be cleaned with emery paper and to paste the seams with strips of fiberglass epoxy resin. Then fiberglass or gauze on the resin paste over all the bottom of the deck bow section and the box-seat. Overlap the cloth carefully and thoroughly primatyvajutsja not to leave bubbles, the edges overlap by 20-30 mm. After drying, the whole pasted surface is sanded with abrasive stone.

It remains to make the seat cushion and on the bottom to install the sponsons. Preparing for the cushion frame, the size of which is dictated by the inner perimeter of the box seat. To the frame with screws on the resin is attached to the platform made of plywood 10 mm thickness: together they form a cover for the box. On top of it is covered artificial leather on foam pad — soft seat cushion.

The sponsons are cut from the bar 10X40 mm and have a cross-section of a triangle, the wide face which should be parallel to the bottom. The first step is installed under the projecting edge of the trim flat part of the bottom; the second — stringer, the third to the hull side. They are installed by laying strips of fiberglass cloth on the screws with resin.

REMOTE CONTROL

Manufacturer hydrocort ends up installing remote control outboard motor. It includes a motorcycle wheel, the drum helm, cables, steering and gas throttle, rotary fixture and two rollers. Motorcycle wheel welded to shaft any length of steel pipe Ø 20 mm. On it is fixed a drum made of aluminum or PCB Ø 200 mm and height is based on 2-3 round rope, the diameter of which is equal to 3-4 mm.

At the end of the shaft is mounted a bronze stop and the hole in the jumper seat is enhanced by the bronze ring, which plays a decorative role.

The rotary fixture is a yoke, to which are welded the two wings, all of the steel strips 40 mm wide and 4 mm thick. the total length of the wings should not exceed the diameter of the drum. The clamp is attached to the engine block with bolts M10 at a height that would preclude the misalignment of the steering cable, attached to the wings using lanyards and passes through the rollers 40 mm mounted in l-shaped brackets on the edges of the transom plate.

For fixing the gas cable to the engine must be installed in the bracket in the shape of P from a steel strip of a thickness of 3 mm. For the rope outlet in the engine hood is cut. To ensure self discharge gas is set the spring on the throttle lever. In addition, hydrocort must be equipped with a safety switch that ensures the motor to stop if the driver didn’t keep the seat.

PAINTING

The most recent works and finishing. They are executed in the following order. Acetone or baking soda are degreased body and the parts to be painted. Epoxy or primer PF-00-2 should be filled by bumps, cracks, burrs. After drying and Stripping — a common putty with the same materials. Again drying and Stripping, after which a General primer zinc white, another drying and local podgotovka. The prepared surface is painted with a decorative enamels: pentaftalevyh No. 570, PF-115, glyptal. Then drying, polishing and final coating water-resistant (pentaftalevyh, glyptal) varnish, after which a final drying and polishing.

I. TSYGANKOV, head of the society of hydracarina Donetsk obsut

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