Experimental Study on the Application of a Local Propeller for Improving the Propulsion Performance of FRP Fishing Vessels

Abstract

This study aims to evaluate the performance improvement of fishing vessels made of fiberglass-reinforced
plastic (FRP) using locally manufactured propulsion components. Two vessels, KM. Nelayan 271 and KM. Nelayan 371,
were tested to identify and resolve the underperformance issue, as both initially failed to achieve the target service speed of
7 knots. The experimental approach involved field installation, configuration adjustment, and sea trials. On KM. Nelayan
271 , the original D22×P20 (three-blade) propeller was replaced with a D24×P22 (four-blade) model, resulting in a speed
increase from 5.3 to approximately 7.1 knots at 2000 RPM. On KM. Nelayan 371, the gearbox was replaced from WHG17G
(3:1) to MA125 (2:1), allowing the vessel to exceed 8.3 knots using the same propeller configuration. These results
demonstrate that optimizing the gearbox ratio and propeller geometry effectively restores the propulsion balance and
enhances vessel performance. The findings provide empirical validation that domestically manufactured components,
specifically the B-Series propellers produced by BTH Surabaya, can meet the operational standards for small fishing
vessels. This achievement supports Indonesia’s initiative to strengthen the TKDN policy and reduce reliance on imported
marine propulsion systems.