Catamaran stability

Discussion in 'Boat Design' started by Conceptia11, Nov 22, 2016.

  1. Conceptia11
    Joined: Nov 2016
    Posts: 1
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: INDIA

    Conceptia11 Conceptia

    Catamaran hulls are known to provide a reasonable metacentric height and hence a lower rolling period, but providing a catamaran hulls for passenger or pleasure crafts make the ship stiff and hence cause violent motions.So how is an ideal rolling period of 10-12 seconds achieved in a catamaran hull?
     
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Same way as any hull...waterplane (i.e. Ixx) to weight (i.e. volume) and height of CG. That's why high speed passenger cats generally have lower beams and more decks than optimum for performance.
     
  3. Ad Hoc
    Joined: Oct 2008
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    Location: Japan

    Ad Hoc Naval Architect

    As JEH notes the key is the WPA.

    This can be achieved in 2 different ways, increasing the volume or reducing the waterplane area. But increasing the volume means a vessel like the big RoRo types circa 5-1000 tonnes. Or if a vessel has a small waterplane area, what is it...a Swath. And it has roll periods that you seek but at much reduced size.

    Take your pick....

    More info here too
     
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