Kann mir jemand erklären wie ich die Hydrostatische Funktion auf mein Volumenmodell anwenden soll?
Bei mir heisst es immer: “Wasserlinienfläche = 0” !!??
Gruss Rainer

Can you post your model, that will certainly help to pinpoint the problem.

(and if possible, ask questions in English, a large part of the people here can read/write English and so you increase the chances of someone answering your question)

you are right Menno.sorry about my german…

I designed a model and would like to know how it behaves in water. I have found the function hydrostatics, but do not know how to use it.

model.3dm (1.2 MB)

You need to provide Waterline Elevation in Rhino global coordinate system units (Z coordinate). For elevation 0 waterline is below your boat, so no data to show. Your model lowest point is about 370 units above XY plane.

Also to not get confused I advice to choose units that should be used in your model.

got it ;-), thank you Lukasz.
in fact my exported file lost the units. The original includes already mm…
however, as I understand now, i have to make an assumption how far the volume dips into the water?
I thought and hoped, that will be calculated for me?

Rhino is not a stability software. You are talking about balance between weight and dispalcement (including heel and trim angles). It is often realized in stability software in loop until difference between weight and displacement is below some tolerance. Rhino is not providing such funtionality. You could write your own script for that (it will not be as efficient as in real stability software), or try Orca 3D plugin.

thank you for your prompt assistance :wink:

As free solution you may also check SwordFish or my Hull Shape Assistant.


where is the difference between

  • Orca 3D
  • swordfish
  • hull shape assistant

if competitors, which are you prefer to use?

To be as honest as possible I think we would need to add here also Rhino built-in hydrostatics, Nemo plugin, SeaHorse Hydrostatics plugin and Naval Architect Toolbox plugin to the list of tools helping with calculating hydrostatic data. I will try to write some comaprison in next few days, but my opinion may be biased since I am developer of one of those tools.

advertising is welcome, but I do not want to install everything only to find out that I do not need it

which is yours and where is your focus?

ORCA is a full blown, highly accurate plug in for Rhino that includes many features for the design of yachts and ships including full hydrostatics and stability, cross curves of stability, the capacity to run a lines plan, weight study, displacement speed analysis through the Holtrop Method and finally, a truly cost-effective computational Fluid Dynamic Analysis tool that was born from a partnership with Semerics. ORCA is a very valuable tool for the yacht design and ship design community and far exceeds any other Rhino plug in tool for naval architecture.

thank you Robb
frankly speaking, I’m not a professional in this field and therefore the tool is too expensive for me ;-(

How much do you know about boat design and analysis? What do you want to know about the design?

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As Rob wrote Orca is most sophisticated and complex toolbox well integrated with Rhino to design vessels with length below 80m (longer vessels need damage stability analysis which is not implemented in Orca).

However tool is just a tool, and its choice is irrelevant if you don’t know what you want to do.

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Actually, I don’t know much about boat design.
I just want to know here if my shape is good in the water.
What happens when I get in? What happens when a person sits on the right or left (lengthwise about in the middle)? And how deep does the boat sink more into the water when 2 people (a ca 90kg) sit next to each other?

I draw out a scribble with some different situations. The question is whether the functionality is good enough for those hypothesis?

You may need a consultant. Or a lot of time and boat design/stability books. I am not specialized in boats, but maybe @Robb or @davidcockey could suggest something.