NavCad provides:

• Confidence in Predictions;
• Evaluation of hull, appendages, propeller and engine as a total System;
• Large database of prediction methods;
• Expansion of model tests and reduction of trials data;
• Aligned predictions with known data to increase accuracy.

The shaft power analysis determines the overall power requirements of the vessel. By accurately matching the propeller's delivered thrust with the vessel resistance the equilibrium propeller RPM and true open-water efficiency are determined.

The algorithms within NavCad are built from tests of over 1000 models and full-scale vessels. Using algorithms developed by statistically reducing these tests into regressed formula ensures the user of a large and stable dataset. The use of NavCad model test files, with the aligned prediction and extrapolation features allows the user to "customize" and extend this database of hulls without limit.

NavCad can perform a number of different analyses, including:

• Resistance due to hull, appendages, wind, seas, and towed barges or nets;
• Shaft power prediction;
• Propeller optimization and selection of engine and reduction gears;
• System analysis, fuel consumption, and off-design point analysis;
• Free route or towing analysis;
• Model test data expansion;
• Trials data reduction;
• And propeller quicksizing.

NavCad is recognized as the most comprehensive program of its type available today, providing a complete platform for the steady-state equilibrium analysis of performance from hull to engine. In addition, NavCad has a number of features that make it unique. These include:

• The Appguide, which leads the user through the entire process of analyzing the vessel;
• The Method Expert, which ranks the various prediction methods according to their applicability to your design, based on speed regime, range of hull parameters, and availability of hull details;
• Model Test Expansion and Trials Data Reduction, allowing the designer to quickly analyze model test or trials data, and use the results for further powering analysis;
• A Sensitivity Analysis, which helps the designer to understand which hull parameters have the largest impact on resistance performance;
• The Minimum Drag Analysis, which is a powerful tool for optimizing the hullform parameters;
• And Aligned Predictions, which allows the use of model or full-scale data to increase the accuracy of the prediction methods.

Because NavCad is a parametric tool, it can be used in any phase of the design process, starting with very early conceptual studies. As the design progresses, more detailed studies can be carried out. Using NavCad’s minimum hull drag analysis, the designer can define search ranges and intervals for significant data items such as length, beam, or longitudinal center of buoyancy, and NavCad will predict the drag for the various configurations and rank them. NavCad may be used as a standalone program, or as part of the FlagShip suite, the parametric hull data may be read from an IDF file created by FastShip.

NavCad provides the naval architect with a tool to confidently predict the performance of his design, evaluating the hull, engine, and propeller as an entire system, rather than just looking at each in isolation. With its large database of prediction methods and its ability to expand model test data and align predictions, it can be productive in every stage of design.

NavCad is developed, owned, and copyrighted by HydroComp, Inc.

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