lateral plane area and twin rudder

DELFTship forum Hydrostatics and stability lateral plane area and twin rudder

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    • #33714
      AvatarFilip Patcev
      Participant

      Hi,

      I have design of small sailboat with twin rudders but hydrostatic report doesn’t include rudders in lateral plane area. When I have single rudder in the center than it works. But I need twin rudders. Any suggestions?

      Thanks.

    • #33715
      AvatarMarven
      Keymaster
      1. Place the rudder on the center and double the calculate area
      2. Ignore the rudder, and manually add the area. I beleice the planform area is also displayed in the keel/rudder wizard
    • #33760
      Avatarotaku
      Participant

      Interestingly, last night i found that on my twin-rudder model, reducing the gap of some 3 feet between the hull and the rudder decreased the resistance. I am not using a single rudder with doubled surface, since i’m designing a twin-rudder ship and want to have the rudders exported as .dxf and other formats.

      So, is there something beneficial going on that we aren’t appreciating?

    • #33800
      AvatarFilip Patcev
      Participant

      Marven, thanks for your answer but one more question: in which way is calculated center of effort of lateral plane – is it geometric center or some other method (hydrodynamic, etc.)?

    • #33801
      AvatarMarven
      Keymaster

      Hi Filip,

      DELFTship uses calculates the geometric center of the longitudinal section on the centerplane. Only the hydrostatic layers are used for this section, so most likely that would be the hull, keel and rudder.

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