<![CDATA[Rope and fishing-net entanglement can obstruct vessel propulsion and create hazardous manual-removal operations. This applied study designed a shaft-driven scissor-type rope cutter, examined its analytical and finite-element response, and assessed the cutting performance of a CNC-machined prototype on an outboard-motor demonstration rig. A 150 mm rotating assembly was modeled in SolidWorks 2025, and the stopper bolt and blades were examined in ANSYS Workbench 2023 under specified static loads. The analytical transient-torque limit was 152.507 N·m, and the calculated critical stopper-bolt diameter was 3.82 mm. The rotating and fixed blades exhibited XY-plane shear-stress components of 195.59 and 105.11 MPa, respectively; however, their overall maximum shear stresses and equivalent stresses revealed local concentrations that prevent an unconditional structural-safety conclusion. During manual-shaft rotation, 2, 4, and 6 mm nylon ropes were severed in one revolution, whereas 8 and 9 mm ropes required two and three revolutions, respectively. The single manual-rotation tests demonstrated successful rope severance across five nylon-rope diameters. However, these observations do not establish cutting repeatability, structural reliability, or operational effectiveness under powered shaft rotation. Further work is needed to evaluate material-specific strength, blade-root geometry, bolt failure, and dynamically driven cutting conditions.]]>
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