Navigation:  Quick Start Tutorials > Hydrostatics & Stability

This tutorial shows you the basics of computing hydrostatics and stability in any condition in Orca3D. For more detailed instructions and background information see the Hydrostatics & Stability section.

 

 

In Orca3D, you may compute hydrostatics and stability at a range of waterplanes, or one or more combinations of displacement and center of gravity.

 

1. Start the command through the menu, toolbar, or command line.

2. Select the surface(s) to be included. Be careful to only select surfaces that could potentially be wet. Do not select interior surfaces, only surfaces that are part of the "displacer." Hit Enter.

3. The following dialog will appear.

Enter the Model Sinkage, Trim, and Heel, or the Weight (displacement) and a combination of LCG/Trim and TCG/Heel. You may enter a list of values, separated by commas or ellipses. For example, a list of Model Sinkages might be

       1,2,3,4,5

or

       1,2,...,5

The spacing implied by the first two numbers will be used until the last number is reached or exceeded. Note the commas before and after the ellipses.

4. If your model represents only half of the vessel, be sure to check the box entitled "Mirror About Centerplane."

5. If you'd like to see a planar surface that represents the waterplane in the resulting condition, check "Add Plane(s) Representing Water Surface." The centers of buoyancy and flotation will be marked as well.

6. The model can be moved so that the Z=0 plane represents the waterplane. If you'd like to transform the model, check the "Transform Model to Resultant Condition" box.

7. If you want to see Righting Arm data, check the "Compute Righting Arm at..." box, and enter a list of heel angles. Note that you will now also have to enter the VCG.

8. If you want full output for each heel angle, check the "Print Full Output..." box. This may result in a very large report.

9. If you need to add surfaces to those you originally selected, click on "Add Objects," and select them. Hit Enter, and you will return to the dialog.

10. Click on OK. The results will be computed and displayed in a new window. Use the controls at the top of the report to navigate to the various pages in the report. Note that the report can be printed, or saved in either PDF or Excel format.

 

 

See also:

Hydrostatics & Stability