Construction of a boat made of plywood. Boat made of seven pieces of construction plywood
Boat of seven parts
A short article about the ace «Jack Shprot» (see here) attracted the attention of our team of yachtsmen. I liked the boat very much for its compactness (2,3x1,3 m), rather large capacity — in the photograph there were four adults and two children in it, and the simplicity of the manufacturing technology.
We took the overall dimensions of the ace given in the article as a basis and made a similar plywood boat within a week.
For the construction of the boat, sheets of ordinary construction plywood with a thickness of 4 mm, glued (a «mustache» connection was used) up to a length of 2400 mm. Of these, according to the following sketches cut out the blank skin.
General view of the boat (a), transom cutting (b), cross-section along the midship frame (c) and a sketch of the paddle (d).
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Cutting of the outer skin sheets.
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The case assembly looked like this. Having laid the bottom blank on the floor and the corresponding edges to it — the billets of the zygomatic belts, they were joined together. First, the blanks are connected approximately in the middle of the length of the boat using clips made of copper wire with a diameter of 1.5 mm. Then, gradually bringing the edges closer together, the same paper clips are consistently placed in the nose and stern along the entire length of the cheekbone. At the extremities, the shape of the hull is set by the bow and stern transoms.
Holes with a diameter of 2 mm for paper clips must be drilled in advance in increments of 100-120 mm along a line beaten off at a distance of 8-10 mm from the blank edge processed to a clean size. It is better to twist the ends of the wire from the outside of the case, as shown in the sketch.
The sequence of connections along the grooves of the skin:
a — setting of wire clips and crimping them; b — the groove is ready for the lining of internal fiberglass tapes; c — the layout of the tapes in the joint.
Similarly, the billets of the sides were attached to the zygomatic belts of the skin. Staples were also used to connect the skin to the transoms.
Then all the connections were in two or three the layers are glued from the inside with fiberglass tapes. After polymerization of the epoxy resin and removal of the ends of the paper clips, the same fiberglass strips were applied to the grooves on the outside of the case. When the transverse cans and the nose plate (120x120) were inserted, and the rest bars were glued along the upper edges of the sides, the hull acquired the necessary rigidity. The bottom was reinforced with thin pine strips glued to the plywood from the inside.
As it turned out, for the convenience of assembling the case by this method, it is best to use plywood of the same thickness everywhere, as provided by Jack Holt, the author of the ace. To increase the moisture resistance and durability of the plywood case, we glued it on the outside with two layers of thin fiberglass on epoxy resin. On the bottom they pasted a «falshkil» with a 50x6 cross section. A small fin was placed in the stern to increase stability on the course. Foam blocks were fixed under the cans. The total weight of the boat turned out to be 35 kg.
The four-year operation of the boat as an onboard ace on the yacht «Vityaz» confirmed its high operational qualities. It was also used quite successfully under the Salyut engine.
We think that by slightly reducing the height of the side, and, consequently, by reducing the weight (this will be especially noticeable in the case of water-resistant plywood), a boat of this type can also be recommended to motorists for transportation on the upper trunk of a microliter.
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