The COASTAL DRILLER has a trim of 2.13 feet by the stern. The draft in sea water at the forward draft marks is observed to be 8.0 feet. The KML is __________.
• Longitudinal metacenter (KML) and how it relates to trim • How trim in feet, draft readings, and distance between draft marks are used to find longitudinal stability terms • The relationship between moment to change trim (MCT 1 inch or 1 cm) and KML
• Think about which hydrostatic or stability formula links the vessel’s trim to the longitudinal metacentric radius (KML). • Ask yourself: what additional ship dimension is normally involved when converting a known trim and draft condition into a value for KML? • Consider how small‑angle trim is related to a metacentric height-type term and the vessel’s length between perpendiculars or draft mark spacing.
• Verify what KML represents: distance from the keel to the longitudinal metacenter, not a moment or a trim value itself. • Make sure you use consistent units (feet vs inches) throughout any formula you recall for trim and KML. • Before choosing an answer, check that your result is a reasonable magnitude for a longitudinal metacentric radius on a vessel the size of COASTAL DRILLER (typically a large number of feet).
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