Secondary stability, also known asreserve stability, is a boat or ship's ability to right itself at large angles of heel (lateral tilt), as opposed to primary orinitial stability, the boat's tendency to stay laterally upright when tilted to low (<10°) angles.^[1]

The study of initial and secondary stability are part ofnaval architecture as applied to smallwatercraft (as distinct from the study ofship stability concerning largeships).

A greater lateral width (beam) and more initial stability decrease the secondary stability- once tilted more than a certain angle the boat is conversely harder to restore to its stable upright position.

• Primary stability
• Tertiary stability (also calledinverse stability^[2]): Tertiary stability is undesirable as it causes a vessel toremain upside-down.Self-righting watercraft have negative tertiary stability, and nolimit of positive stability. For kayak rolling, the stability of an upside-down kayak is also important; lower tertiary stability makes rolling up easier.

• Ship stability
• Kayak § Types of stability
• Limit of positive stability — boats

Johnson, Shelley (2009).The Complete Sea-Kayakers Handbook, Second Edition. Asbjorn Jokstad. p. 20.ISBN 978-0071748711.

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