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NavCad™ version 2009 includes many new features,
such as:
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NavCad™
is a software tool for the prediction and analysis of vessel speed
and power performance. It also provides for the selection of suitable
propulsion system components - engines, gears and propellers.
Built from a very comprehensive library of algorithms, NavCad can be used for the design and analysis of virtually any type of monohull or catamaran - from large displacement vessels to fast planing craft
. The Project View contains a tree (much like Windows Explorer) that you can use to quickly open data entry forms and run calculations. It also contains a "snapshot" of the project's principal parameters - such as Displacement, L/B or engine power. The Performance Summary is a spreadsheet presenting the current system performance. It is a complete look at the results of your project calculations, from resistance all the way through engine power, fuel rate and cavitation. The Performance Summary also underscores the fundamental nature of NavCad™ - where all performance items are related through a Hull-Propulsor-Engine equilibrium. What vessels can I evaluate with NavCad™ ? NavCad™ can be used for virtually every type of displacement, semi-displacement and planing craft, river barge, sailboat and catamaran. Towing and free-running analyses are supported, as are a variety of propulsor options. |
What
makes NavCad™ different ? What is the "minimum hull drag" analysis ? Once hull data has been entered and a resistance prediction built, you can analyze and optimize your hull with the Minimum hull drag analysis. You define search ranges and intervals for significant data items (e.g., length, beam, LCB), and NavCad™ predicts the drag for the configurations and then ranks it. The configuration with the minimum drag is displayed at the top of the list, with the difference from minimum displayed in percent of drag. The calculation also has the ability to review a compromise analysis, using a time-weighted average of two speeds. |
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| NavCad™
new function: blade impulse pressure. This is a prediction of the pressure on the local hull region around the propeller from combined cavitating and non-cavitating pressure impulse of blade frequency. |
Blade impulse pressure is a vibration excitation source, and thus is a useful parameter in evaluating the likelihood of noise and vibration from the propeller. |
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| Naval
architects, marine engineers, hydrodynamicists and researchers in
shipyards, design consultancies, equipment manufacturers, navies
and research institutions all rely on NavCad™. |
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Prediction
accuracy is insured by offering a) the largest available suite of
prediction methods (over two dozen for bare-hull resistance alone),
b) compatible components between methods, c) calculations built
from contemporary state-of-the-art methodologies, d) a complete
analysis environment where critical components (like shallow water
resistance, for example) cannot be forgotten and e) dedicated evaluation,
testing and internal R&D (see MacPherson, D.M., Reliable Performance
Prediction: Techniques Using a Personal Computer, SNAME Marine Technology,
Vol. 30., No. 4, October 1993). In addition, NavCad™ contains HydroComp's Method Expert prediction method ranking system. This feature takes your vessel data and ranks all monohull prediction methods based on speed regime, ranges of hull parameters and the availability of hull details (e.g., if waterplane coefficient or trim, for example, has been entered and is used in the method). It also takes into account HydroComp's extensive knowledge about prediction method behavior and reliability. Warnings are raised if a method has shown poor results for the given vessel information. |
What
propulsor types are supported by NavCad™ ?
NavCad™ greatly extends your propulsor options. In addition to the popular B-series, Gawn and Kaplan propellers, NavCad™ includes surface-piercing and cycloidal propellers, cupped propeller prediction, use of custom Kt/Kq data and the much anticipated waterjets. Can
NavCad™ evaluate cupped propellers ? |
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do I use my Kt/Kq model test data ? New file types have been added to allow you to enter Kt and Kq versus J data from your propeller model tests or wake-adapted calculations. These simple ASCII files are then used as the source of propeller performance for Shaft Power and System Analysis calculations. NavCad™ even properly applies scale correction during the calculations. At the current time, these files cannot be used for Optimum Propeller calculations (since the propeller P/D ratio, number of blades and blade area ratio are already defined). What kind of support is available from HydroComp ? NavCad™ includes both on-line and printed User's Guides and Help systems, which can generally answer most questions. In addition, 90 days free maintenance and telephone/fax/e-mail support are included with the purchase. The annual maintenance, support and update (MSU) subscription offered by HydroComp will insure that you continue to receive all updates and in-depth technical support. HydroComp also maintains an extensive library of technical references that can be accessed by users. A quarterly newsletter provides useful hints and suggestions, and on-site or seminar training is available. Technical support is of course also available through DS&T. Can I use NavCad™ with my other software ? NavCad™ is suitable for use either as a stand-alone tool or in conjunction with other naval architectural design software. NavCad's simple parametric hull data makes entry of vessel details very easy. NavCad™ also supports the IMSA open hull data transfer standard (IDF) so that hull data developed in a design or stability program can be exported to NavCad™. |
Like all NavCad files, the format for the waterjet files is available from HydroComp. We also provide a Microsoft Excel template to help create waterjet files. Many files are already being made available to NavCad users who are up-to-date on their support and update subscription . . |
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| NavCad™ is a Windows program for use with Windows NT, 2000 or XP. A pentium CPU, 8 Mb ram and 10 Mb of hard disk space is required. Windows 98 can also be used, but is no longer officially supported. With regards to hardware, any modern PC will do. Who
uses NavCad™ ? |
| Link to Hydrocomp inc. |
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