The heeling force of the sail is balanced by the force of the keel.
This opposes the heeling moment of the wind pushing sideways against the boat's sails.
When heavy loads are being lifted, a heeling tank is used to balance the vessel.
Her large heeling tanks and one fuel tank were converted to storage tanks for recovered oil with a combined capacity of 2,033 cubic meters.
They could float in as little as 3 feet (1 m) of water and could dry out in the tidal waters without heeling over.
She also has heeling tanks which can be filled and emptied with seawater in turn to rock the ship to widen the channel.
She also has eight heeling tanks that can be used to free the icebreaker from compressive pack ice.
In some high-performance racing yachts, water ballast or the angle of a canting keel can be changed to provide additional righting force to counteract heeling.
