Capsize angle

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Stability curve: Righting lever arm (GZ) depending on the heel.

The capsize angle is the angle of heel at which a watercraft tips over, capsizes . This angle depends on the course of the ship's stability curve and the course of the acting torque .

Two points are used to characterize the stability curve:

At the static overturning angle , the maximum point of the stability curve, the vehicle would overturn if the moment acting there were angle-independent. However, this is rare, as in most cases it is caused by the wind pressure on the sails and this decreases with the heel.

A counter-example, in which the vehicle capsizes when it reaches the static capsizing angle (or even sooner), would be a floating crane with a lifted load, because here, due to the longer effective lever arm, the acting moment increases with the heel.

At the dynamic overturning angle , the following zero point, the vehicle would overturn without an external moment. One imagines that this angle was reached dynamically, for example by a crusher , hence the name. For small boats and dinghies this angle is typically around 90 °, for yachts with ballast keel it is 120 ° to 150 °.

The stability curve changes sensitive to water ingress or liquid, pourable or shifting loads, see list .


  • Schult, Joachim: Segler-Lexikon. Bielefeld: Delius Klasing, (13th edition) 2008, ISBN 978-3-7688-1041-8
  • H. Dieter Scharping: Construction and construction of yachts Bielefeld: Delius Klasing, (3rd edition) 2008, ISBN 978-3-7688-2489-7