Marine Design Plug-in for Rhino

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Speed and Power

 

“How fast will it go?” The Orca3D Speed/Power Analysis module has two different prediction methods: the Savitsky method to predict the speed/power curve for chine hulls, and the Holtrop method to predict the speed/power for displacement hulls. We have integrated the HydroComp Drag Prediction Library, to ensure reliable, accurate results.

Most of the required input parameters are automatically computed from your model, although the user can input or override the values. Results are quickly generated and professionally formatted, and include checks to ensure the validity of the results. Any parameters that are outside of the ranges of the prediction method are flagged.

  Planing_input_dialog

 Holtrop_input1

 

The results of the analysis are presented in easy-to-read reports, which include a summary of input data, checks of the parameters of your design versus the limits of the analysis method, and performance data versus speed. Plots of various parameters are also included, and the entire report may be printed or exported to Microsoft Excel or PDF.

 

Planing_tabular_1

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Planing_power_plot

 

In addition to predicting the performance, the analysis gives insight into how to improve the performance, with a Drag Reduction Analysis. Four key parameter are evaluated, and recommendations given on adjustments to optimize your design; Planing Beam, Deadrise Angle, LCG location, and Shaft Angle.

 

Planing_tabular_2

 

Holtrop_output


 

Chuck Neville Charles Neville Associates

You can also evaluate the results with their suite of performance, weight, stability and other tools. I have found that even outside of boat design they have provided many new and useful controls that add to Rhino’s overall functionality on all kind of projects. Beyond the tools themselves the developers at Orca3d have always offered great support whether it’s understanding the program itself or helping you to figure out the best way to perform a necessary task. And that is probably the bottom line. Orca3d is software designed for Naval Architects and yacht designers by a group of practicing Naval Architects. They understand not just how to write software code, but what tasks need to be done and how a design professional will likely want to do them. Often that kind of experience and sensibility is a rare thing.