Stability Visualiser
Watch GM change in real time as you consume fuel, introduce free surface, and fill a high ballast tank. The cross-section shows K, B, G, M live — and the GZ curve redraws instantly. Push all three controls to their extremes and see the vessel loll.
What you're practising
How fuel consumption, free surface effect, and high ballast each move KG — and why the combined effect can produce negative GM and loll.
Pass criterion
Explain GM = KM − KG, the free surface correction formula, and what happens to the GZ curve when GM goes negative. Identify loll on sight.
Removes 0t from double bottom (KG 0.5m) → G rises
i_t = 100 m⁴ — toggle to activate
Adds 0t at KG 6m — raises G further
KG
3.10 m
KM
4.20 m
GM
+1.10 m
GZ curve — righting lever vs angle of heel
Module 15 — Study Notes
Full written notes covering GM, righting lever, free surface effect, freeboard, watertight integrity, and heavy weather preparation.
Open Module 15 notes →