lateral plane area and twin rudder
› DELFTship forum › Hydrostatics and stability › lateral plane area and twin rudder
- This topic has 4 replies, 3 voices, and was last updated 11 years, 4 months ago by
Marven.
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AuthorPosts
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October 10, 2009 at 20:30 #33714
Filip Patcev
ParticipantHi,
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.
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October 11, 2009 at 21:21 #33715
Marven
Keymaster- Place the rudder on the center and double the calculate area
- Ignore the rudder, and manually add the area. I beleice the planform area is also displayed in the keel/rudder wizard
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November 17, 2009 at 05:14 #33760
otaku
ParticipantInterestingly, 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?
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December 5, 2009 at 00:36 #33800
Filip Patcev
ParticipantMarven, 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.)?
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December 5, 2009 at 01:02 #33801
Marven
KeymasterHi 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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