en سازه کشتی Ship Structure مقاله پژوهشي Research Paper <span style="font-size:8pt"><span new="" roman="" style="font-family:" times=""><span style="font-size:11.0pt">High-speed monohull vessels with chine hulls are widely used due to their simple design, but maintaining optimal performance at high speeds requires precise hull force analysis. This study utilizes 3D scanning to capture hull geometry, refining it in AutoCAD for efficiency. Hydrostatic and hydrodynamic assessments are conducted using Maxsurf, applying the Switkowski method.</span></span></span><br> <span style="font-size:11.0pt"><span new="" roman="" style="font-family:" times="">The study examines vessel motion, crew comfort, and water ingress under different sea conditions. Results indicate that at a 5.4-degree trim, pitch motion intensifies in harmonic waves, yaw motion increases in beam waves, and pitch and heave motions are more pronounced in head waves. Water ingress becomes a concern at this trim in Beaufort 2 and 3, with MSI peaking at 12.5% in Beaufort 3. The lowest resistance occurs at 5.22 knots, but higher trims raise power demands. Manual trim adjustments using outboard engines and jacks effectively mitigate these effects.</span></span> high-speed vessel,hydrostatics,hydrodynamics,crew sea conditions,water ingress 12 27 http://ijmt.ir/browse.php?a_code=A-10-8180-1&slc_lang=en&sid=1 Seyed Reza Samaei samaei@srbiau.ac.ir 10031947532846004360 10031947532846004360 No Assistant professor, Technical and Engineering Faculty, Science and Research Branch, Islamic Azad University, Tehran, Iran; samaei@srbiau.ac.ir Mohammad Asadian Ghahfarokhi m.asadian@srbiau.ac.ir 10031947532846004361 10031947532846004361 Yes Assistant professor, Department of Marine industries, Science and Research Branch, Islamic Azad University, Tehran, Iran; m.asadian@srbiau.ac.ir