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  Técnic of Drawing:

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Those of us who have an attachment to maritime modeling often, when we go for some of our beaches, we see some boats that we would like to build. We look at it and remember it, however, we do not know how to do it to get an acceptable plan.
This modest treaty, in the form of a summary, will try to solve this fault and will make you (a skilled reader) a good naval technician.
The first thing to do is go to the boat in question, take the sizes of the total sleeve, the maximum height from bow to stern and the center, which will be the minimum. Once in your house, you will make the utensil to the size of the boat under study. (Figures A and B. In cases of large-sized and decked vessels, the sizes can be taken outside as shown in Fig. C). The widget, according to the drawing that is attached, will be of a rule a little longer than the hose of the boat, and another slightly longer than the height of the bow, which will be joined at 90 ° angle. (See fig. 1, num. 10). The vertical rule will guide some 10 or 20 cm to support a regulated wood (in the form of a tape measure) to take the measures.

                                            Figura A                                                                                                                                 Figura B

Figura C

Figure C
To make the description we use a "gussi" model of a length of 4.18 m. In the field drawing no. 1 you can see that we take the measurements on the outside either by Cartesian coordinates.

Figure 1
Materials that we will need: an utensil such as the one described, cord, roll of adhesive paper of 1 cm in width, a meter, a tape measure, a plumb, staircase, notebook and pencil. If it's windy it's good to bring white cards of a foliage format, which did not fit so much.
Work field. We have reached the beach and we are in front of the boat. First we will put the cord tied from bow to stern in the manner indicated in drawing no. 1. Next we will draw the profile of the boat in an approximate way. We will divide the length of the boat on the cord already placed and properly stretched so that the divisions fall onto the center of the quadrants 1,2,5,8,11,14 and 15. If you take notice you will see that both bow As aft the sizes are taken together for the great aftertaste that ships on both ends. The centers on the cord will mark them with small slips of gummed paper. We will take strips of the same paper in the center of these notebooks (see drawing) from the keel to the edge of the boat properly grounded to follow the center of the remainder. With these instructions we will have the boat ready to take the corresponding sizes.
What is a map of lines? The plane of lines of the ship is the descriptive element, which graphically demonstrates the characteristics of its forms. It consists of three projections: longitudinal, transversal and horizontal, which must be made on a scale to allow the lines to be obtained easily and confidently. The lines will rectify one another and move them to other papers or directly to the wood to build the ship.
Before that, however, we will explain the three projections, which shape the ship.
Longitudinal or profile projection. The plane of lines represents, in the longitudinal projection, the profile of the ship of the ship. In addition to its contour, the waterline is determined in it and a series of parallel lines called lines of water, evenly spaced, which are indicated from the bottom up with numbers from 1 onwards.
The waterline and the water line beneath it, are drawn with continuous traces. Those that are above the waterline are fake and are represented with interrupted or discontinuous traces. (See the drawings of field numbers 2 and 3).

Figure 2

Figure 3
The longitudinal profile also shows the cross sections, which correspond to the drawing frames, represented by lines perpendicular to the daigua lines. They are usually separated by equal distances and numbered starting from the left. This projection also shows curved lines that correspond to the profiles of the vertical or longitudinal sections, which we will see now represented in the horizontal projection and that are indicated with Roman characters. (See drawing field number 4 plane in longitudinal forms.)

Figure 4
Horizontal or plant projection. It is usually drawn below the longitudinal projection the horizontal, which corresponds to the representation of the ship seen from above. Figure in this projection the cross sections, as an extension of those indicated in the longitudinal projection.
From a line of cruxia or symmetry axis, directed from the middle part of the stern, to the point of convergence of the bow and parallel to it, we appreciate the vertical sections, which correspond to perpendicular cuts to The water lines. The limits of these, when cutting the ship, produce the curved lines, marked with Roman numerals already mentioned in the projection vertigo



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