MULTIPLE HARD CHINE SAILING YATCH MODELING
› DELFTship forum › Hull modeling › MULTIPLE HARD CHINE SAILING YATCH MODELING
 This topic has 6 replies, 3 voices, and was last updated 13 years, 6 months ago by dssdaad.

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December 29, 2010 at 17:08 #34522dssdaadParticipant
Hello,
I am very new at design of yatch(I am a mechanical engineer). My question is about longitudinal chine profile geometry.
The yatchs are sailing there is sometimes a trim angle. To decrease drag of chine profile I think the chine profile must have a collinearity to velocity profile of the yatch. How can it be optimised? My second question is there any option in order to align control points to a vector?
Thank you. 
December 30, 2010 at 14:13 #34524MarvenKeymaster
Optimising your chine profile to reduce the resistance can only be done by calculating the drag. The Delft yacht series included in Delftship is not suited for that since it calculates resistance based upon hydrostatic values and coefficients. What you’ll need is a way to calculating the resistance directly from the geometry. This can only be done by using CFD software.
The answer to your second question is yes. If you have selected 3 or more points then you can use the “Align” command from the “Point” menu which is found under “Edit” in the main menu. It will project all points on to the line which is defined by the first and last selected control point.

December 30, 2010 at 15:24 #34526dssdaadParticipant
One more question please. What can I do if I want to convert a hard chine into a round chine?
Thank you very much for the clear answers.

January 1, 2011 at 18:09 #34527indraParticipant
May I ask a few questions? How do I determine the size of the LWL of a boat like searider if only to know Lmax, Bmax, Draft and Displacement?? And how to calculate the weight of construction of a boat made of fiber?
:cheer: 
January 2, 2011 at 13:40 #34528MarvenKeymaster
metin_mehel wrote:
One more question please. What can I do if I want to convert a hard chine into a round chine?
Select the hard chine edge (the red lines) and then choose “Edge” > “Crease” from the edit menu. This will make a smooth transition between the patches joined by the edge.

January 2, 2011 at 13:47 #34529MarvenKeymaster
As a designer you should always know the weight of your boat. In an early stage you can estimate the weightby looking at similar boats. Later on in the design process you should have enough information to calculate the weight. This means you”ll need to knwo the weight of every part or piece of equipment on board your vessel.
The weight of the construction is calculated by first calculating the required thickness of the structural elements. Then calculate the volume (area * thickness) and multiply this with the relative density of your material. Once this is done for all structural parts you should have the weight of the vessel.
Once you know the weight you can calculate the exact draught, and with it the L_{wl} and B_{wl}

January 3, 2011 at 11:03 #34530dssdaadParticipant
Is it possible to make this round as a constant radius for example 600mm?


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