This blog post is a highlight of the ongoing support that UBC SailBot is receiving from Orca3D, a marine design plugin for Rhinoceros made by DRS Power & Control Technologies. Orca3D was used in the analysis of Ada to determine her hydrostatic stability and subsequently weight budgets for components in and on her hull. So far in the design of the hull for Ada 2.0, Orca3D has been an excellent tool for calculating the hydrostatic stabilities of candidate hull designs.

As mentioned in a previous blog post (Ada 2.0 and 4000 km of Ada 1.0 Travel) the UBC SailBot team is actively working on designing Ada 2.0 to compete in the 2018 Vic-Maui Race. The design for the hull is well underway and four candidate designs have been modeled and analyzed. One of the most important analyses that must be conducted on a hull design is the hydrostatic stability of the hull at different degrees of heel. Orca3D has been instrumental for this analysis as it performs, among many other functions, hydrostatic stability calculations.

Using Orca3D for this purpose saves a great deal of time relative to traditional methods, namely integrating over sections, as it plugs in seamlessly to Rhinoceros, the CAD program being used to model the hulls. This means that no data export to another program is necessary, and you can set the program to output all manners of useful data and add information to the CAD models themselves (ex. waterplanes).

Orca3D is also more precise compared to integrating over sections as it computes most of the hydrostatics parameters from the surface mesh.

With the ongoing support of a license for the Orca3D plugin, we can continue to efficiently and precisely analyze our designs. Also, continuing access to Orca3D will allow us to explore its wide-ranging functionality, beyond just stability analysis.

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