Modern Design: 1. D/L = 150 2. Cp = 0.58
3. = approximately 1770lbs (approx 800kg) 4. LOA = 18ft 0” (5.5m) 5. DWL = 14ft 9” (4.5m) 6. BOA = 7ft 10” = 7.8ft (2.4m) 7. BWLmax @ DWL = 6.0ft (1.9m)
Coefficients, act as a guide, but the designer has to make a judgement in the first instance selecting a coefficient – usually based on a comparison with similar vessels, or experience.
In the second instance he/she must exercise judgement as to the shape selected, and how this is to be manipulated.
5. WHY IS AMBIGUITY SIGNIFICANT? It is considered significant
in design that ambiguity
allows the designers imagination to work at exploring options, thereby avoiding restrictive mental images or design pre-cursors (atavars) of design options, in a manner analogous to the initial sketches of the marine designer.
It is further considered that of drawings and coefficients in the paper illustrate the sense of ambiguity, as it is this very lack of precision and definition that allows the imagination of the designer to extend and explore the design space.
Arnheim makes these points:
“As long as the guiding image is still developing it remains tentative, generic, vague.
This positive quality distinguished from geometrical
however, is by no means a negative quality. Rather it has the
of a topological shape.
vagueness, As
shapes, a topological
shape stands for a whole range of possibilities without being tangibly committed to any one of them. Being undefined in its specifics, it admits distortions and deviations. Its pregnancy is what the designer requires in a search for a final shape. [1]
Figure 12. Modern option
The sheerline, bow rake, and DWL differ, although freeboard at the bow and stern are the approximately the same. BWL @ midships DWL also differs as the modern version was eventually developed as a hard-chine, not multi-chine model.
The coefficients used and basic overall geometry are identical, variations could be brought into line if desired.:
D/L = 150 Cp = 0.58
= 1770lbs (approx 800kg) LOA = 18ft 0” (5.5m) DWL varies = (5.3m) & (4.5m) BOA = (2.4m) BWL varies = (2.24m) & (1.9)
The question of topological shape is interesting (especially in view of software developments currently underway) In terms of visual form we can see that the topological nature of sketches has a potential unavailable in other images, for as examples suggest, geometric shapes are definitive, but topological shapes:
Stand for a range of possibilities and are Intangible.
Undefined in specifics. Admit distortions and deviations.
Flexible. Goldschmidt says;-
“A sketch is a reflection of the guiding mental image, but it is not, and cannot be, identical with it, and this difference is precisely what makes it a precious instrument for the designer”. [5]
While Arnheim considers:- “By making a sketch, the designer supplies the mental image with the assistance of an optical image, which has
© 2008: Royal Institution of Naval Architects
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