Ship Free Surface Effect (FSE) & Virtual GM Loss Calculator
Determine virtual rise in center of gravity ($GG_1$), second moment of liquid surface area ($i_T$), and longitudinal bulkhead subdivision benefits for slack tanks.
Vessel & Slack Tank Geometry
Ballast = 1.025, HFO = 0.95, MDO = 0.85
Free Surface Correction & Fluid GM
Virtual Loss of GM (GG₁)
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Effective Fluid GM_fluid
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Second Moment i_T
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FSE Moment tm
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Cubed Breadth Law
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Longitudinal Bulkhead Effectiveness
Dividing a slack tank in half reduces free surface loss to exactly 1/4 (25%).
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