Evaluation on the Resistance of Traditional Pole and Line Vessels in North Sulawesi
Resistance of traditional pole and line vessels
DOI:
https://doi.org/10.35800/jip.v14i2.69653Keywords:
pole and line, resistance total model, trim fishing boatAbstract
Ship resistance is a critical factor influencing vessel performance during fishing operations. Previous studies of traditional pole and line vessels in Indonesia have focused mainly on catch performance, leaving a knowledge gap concerning the hydrodynamic characteristics of the hull, particularly under varying trim conditions, which directly affect fuel efficiency and propulsion. This study evaluates the total resistance of two traditional pole and line vessel models under different trim conditions and identifies the more hydrodynamically efficient design. Two vessels were studied: Usbar (LOA 15.85 m) from Bunaken Island and Aldeis (LOA 15.50 m) from Bitung, North Sulawesi. Scale models (1:20) were tested in a recirculating flume (450 × 300 × 70 cm) at Sam Ratulangi University from July 2022 to January 2023. Total, frictional, and residual resistance and wetted surface area were measured at eight velocities (0.23–0.41 m s⁻¹, Fr = 0.083–0.147) under four trim conditions (−1°, 0°, +1°, +2°), with three replicates per combination. Analysis of covariance showed significant effects of vessel type (F = 24.17, p < 0.001), trim (F = 18.93, p < 0.001), and their interaction (F = 3.42, p = 0.019) on total resistance. Even keel produced the lowest resistance in both models. Aldeis, with a smaller block coefficient (0.54 versus 0.58), a smaller midship coefficient (0.60 versus 0.74), and a wetted surface area approximately one third smaller, showed lower resistance under every condition tested. Wetted surface area rather than the prismatic coefficient governs this difference at displacement speeds. The Aldeis hull form therefore offers better power efficiency and provides a quantitative basis for improving traditional pole and line vessel design in North Sulawesi.
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