INITIAL DESIGNING CONDITIONS AND RESTRICTIONS:
- type of batana: the batana with rounded sides was used as a base for design, because of the aesthetic reason, later was customized;
- length of the boat: maximal length should be 5 m because of the tax exemption; this is also dictated by the plank length (16'5");
- breadth (beam): narrower at the waterline for better hydrodynamic properties, on the other hand this compromises the stability;
- transom: broader and thicker to allow the outboard motor to be attached on;
- the shape of the bilge (bottom): should be V-shaped to facilitate the emptying of rain water, this should be 2,4" high;
- the keel: should be higher due to better stability and to avoid side sliding in navigation, its height should be 4,7", the keel shoe should be 2";
- hold height: the height of hold should be greater for practical reasons; the height from platforms to the beam should be at least 1'4";
- washboard: should be higher (aesthetic reason) with futtocks perpedicolar onto it;
- boat construction elements: they should be traditionally shaped, but thicker due to safety reason: the bilge timbers should be thick 1,6", wide at least 2,7"; the thickness of planking should be 1,1";
- deck: two hatchways with a transversal bench due to mast positioning; without hatchway covers to stimulate ventilation; the beam curvature should be 2,4".
DESIGNING PROCESS:
With respect to the initial conditions the creation of basic lines in side view is required, as well in the top and front view, which determine the boat shape (for this the 2D drawing program Corel Draw was used). The ship plan was designed in the scale 1 : 1. Details:
- in the side view the curvatures of bilge and deck were firstly shaped, then the forms of stempost, apron, keel, transom, stemson were determined. Here also the height of hold was set and the number of timbers was established;
- in the top view the thickness of keel was set and the curvature of both ship sides at deck level and floor level were defined;
- in the front view only the shapes of the boat sides at the main frame and the height of the bottom were required to be set.
The lines were then exported in AutoCAD format and subsequently imported into 3D drawing program Rhinoceros. For each drawing phase is strongly adviseable to save it under different file (to backup the previous work). Drawing phases were the following:
- preparing of basic contours;
- shaping of the keel, stempost, apron, stemson and transom;
- defining the shape of floor and bilge timbers, and beams;
- positioning of the keelson, beam shelf and lower ceiling plank;
- marking the lines to cut the planks;
- drawing of the futtocks;
- preparing the four planks for the washboard.
Each construction piece was then rotated with its base parallel to the top view. The visible and invisible edges were highlighted using a thicker continuous or dashed line. The procedure then required to print the construction parts on A4 paper format in the scale 1:1. For larger parts multiple pages were printed and subsequently glued together with caution paying attention to perfectly align them. Following this procedure the drawings were prepared for the transfer on wood using carbonless copy paper.
 |
| 3D boat plan grid in Rhinoceros. |
 |
| Half view of the partially prepared ship plan. |
