Zen 24, a new electric sailboat design from Japan

Stability characteristics of the Zen 24 compared with other hull types

Characteristics of sailboat stability with same L.W.L., Beam, Displacement and Keel weight

  hull sections largest righting moment capable sail area boat speed rolling motion feel of ride
  wine glass last stage medium slow slow tender
  Zen form middle stage large fast moderate stable
  hard bilge first stage large fast quick stiff


Types of the hull sections and the characteristics of stability

The stability curve by the type of above hull section

4 Comments to Stability characteristics of the Zen 24 compared with other hull types

  1. Jeff Mueller says:


    I don’t get much out of the top drawings, but am trying to determine whether the green line in the stability curve graph at the bottom id the actual engineered righting curve for the Zen 24? It seems to indicate ultimate stability at about 127 degrees, is that correct? This is an important number for an offshore boat.


    • Yoh says:

      Good question Jeff,
      The ultimate positive stability is at about 52 degrees, not about 127 degree.
      The stability curve indicated with green line at about 127 degree means 0 stability lever which is the angle that the boat lose righting moment. After that, boat has negative stability! Stay capsized if you don’t have a wave to help you to stand up again.
      This is a basic engineering for naval archtecture.
      This graph show just a diagram to makes a point.
      But the curve is almost actual on a calculated based on the hull shape and displacement of the Zen 24.

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