Yacht Stability
The righting lever and moment


The righting lever (GZ)
The centre of buoyancy of the vessel and the centre of gravity create the righting lever.
The righting lever of the vessel.
The righting moment (RM)
  • GZ times the weight = RM
  • The weight of the boat affects its stability.



The righting moment of the vessel.
  • When the weight is multiplied by the GZ, it gives the RM.
  • A heavier boat gives a higher RM and is harder to tip!
The angle of heeling
  • As the boat tips, RM increases.
  • RM reaches a maximum at an angle of about 60°.
Tha angle of heel of the vessel.


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