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Ship motion test
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<p>In <a href="/facts/Marine_engineering/EJTTeWsk">marine engineering</a>, a ship motion test is <a href="/facts/Hydrodynamics/y7uzSCfg">hydrodynamic</a> test performed with <a href="/facts/Ship_model/DGVCbD4e">ship models</a> for the purpose of designing a new (full sized) ship, or refining the design of a ship to improve its performance at sea. Tests are carried out in a <a href="/facts/Ship_model_basin/mwS8UIED">ship model basin</a> or "towing tank". There are various types of test: the model may be towed along a straight line or circular path, and may be subjected to oscillations. Forces acting on the vessel are measured using a <a href="/facts/Dynamometer/IcDW7VUg">dynamometer</a>. The tests may be evaluating the overall design, or focusing on the characteristics of a <a href="/facts/Propeller/0IN0JKXC">propeller</a>. </p>