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DESIGN OF A 4-PASSENGER COST EFFICIENT 29
COMMERCIAL VESSEL

Superstructure, fiber-reinforced plastic composite was chosen to use for its low weight and
excellent physical properties. Moreover, high-density polyethylene (HDPE) which has low
manufacturing cost, high strength values and recyclable characteristic; aluminum that has low
weight and easier production conditions than other options, at last fiber-reinforced plastic which
has mentioned superior properties were selected as possible materials to manufacture the hull.
Suitable material for the hull can be chosen according to production conditions (budget, time,
location, available resources and etc.).

Scantling calculations were made for each hull material alternative depending on related
regulations. Det Norske Veritas’ (DNV) Standard for Certification No. 2:21 was used for
HDPE, ISO 12215-5:2008 was used for aluminum and FRP scantlings [10].

Detailed weight estimation was made based on the equipment list, scantling calculation, engine
selection, general arrangement and some additional features. HDPE hull option was used for
this estimation because of its higher weight value.

Stability calculation was made on Maxsurf Stability Module with the data taken by detailed
weight estimation. Fuel tank permeability taken as 95% and calculations were made for the fully
loaded condition. Seakeeping analysis was made by using Maxsurf Motions Module for
determination of motion sickness incidence (MSI) risks. Analysis was made for all passengers
and captain’s position. 15, 25 and 32.5 knots for 90, 120, 150 and 180 degree headings were
calculated by software.

3.3 Cost Estimation

One of the goals of this study is designing a low-cost vessel. To achieve this goal, vessel has to
be budget-friendly, both initial and running costs. Initial cost of the vessel includes 2 main
components which are manufacturing and outfitting costs. Hull form was selected as one chined
to decrease the manufacturing costs. Additionally, HDPE was projected for reducing material
cost. Initial cost estimation can be seen in Table 3.

Table 3. Initial cost estimation.

Material HDPE Aluminum FRP
Hull * $4000 $5500 $4000
Superstructure *
Main Engine $41500 $65300 $66800
Equipment $5800
Labor $5000
Unexpected Expenses $5000
Total **

*Estimations based on material prices in **Prices given as U.S. Dollar ($)
market and expert opinions. Material
and labor costs included.

Sayı 4, 2015 GiDB|DERGi