Free Surface Correction (FSC)
Free-surface correction for a slack tank - reduction in effective GM caused by liquid shifting in a partially-filled compartment.
Tank geometry
Moment of inertia i = l·b³/12
512.0m⁴
FSC
0.0105m
Reduces effective GM by 1.0 cm.
Formula, assumptions, and limits
Assumes a rectangular tank free surface. For trapezoidal or cylindrical tanks, use the tank-maker's FSC table. Total FSC in a ship's stability book is the sum over all slack tanks.