Trans RINA, Vol 154, Part C1, Intl J Marine Design, Jan - Jun 2012
Figure 7 – Layout development stages for 38’ sailing catamaran
7. LAYOUT PLANNING AND INTERIOR DESIGN
The design of exterior is usually run parallel with boat’s layout planning thus the exterior styling process and the development of general arrangement drawings are inter- related. In our practice preliminary 3D model of a craft is created and is
used to fit depending on propeller shafts kER=1.8...2.0; for
engine length; for system with jet drives
kER=2.2...2.6; for surface drives, pod drives and stern drives kER=1.3...1.7; PT – total installed horsepower, h.p.; z – number of engines.
Engine room not just used to fit engines, but also generator, elements of air-conditioning
desired layout by hand
sketching (fig.7). On results of this process the exterior 3D is updated and further interior modeling is repeated in CAD.
Unfortunately some concept sketches by beginner
designers often provide no real space for the engine or fuel tanks, so those have to be modified significantly and the desired appearance or layout could be lost. There are few checkpoints to remember.
Collision bulkhead – usually installed within 5…10% of length from front end of the waterline; although not required by ISO standards (but required by other rules) it is good practice to provide such.
Regulations for high speed craft define a forward area that is likely to suffer in case of collision, and most regulations do not allow passenger or crew compartments there.
Engine room length lER, m at preliminary design stages can be estimated using formula (valid for single and twin installations):
lk PER T ER 0.072 ( / ) z 0.46 where kER – coefficient of engine room length C-52 system,
water maker, etc. and thus needs decent space for installation and service access.
Space required for fuel tanks is defined from the required capacity of fuel; taking capacity with volume utilization coefficient kF=0.85 for integral tanks and kF =0.6 for built-in bottom tanks. Capacity of fuel is estimated using customer’s requirements or ‘parent’ craft; for planing powerboats can be taken (2…3)L/h.p. of installed horsepower.
Consider hull shapes when drawing the floor plans, as hull sides are not vertical but have some flare. In addition, allow thickness of structure including stiffeners. This is a common problem with ‘land based’ interior designers touching small boats. planning
Accommodation is done
accommodation criteria, schemes and consideration presented in previous chapters.
Detailed procedures for boat interior design are presented in a number of sources; excellent guidelines for boat interior design and styling are provided in [5].
In our practice, interior design for a boat includes styling, plans and elevations furniture and interior
for every materials and fittings, weight room, drawings of
details, selection of interior estimates of interior
©2012: The Royal Institution of Naval Architects
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