Davidson Laboratory Provides Venue for Global Dynamix Model Testing

HOBOKEN, N.J. - The Davidson Laboratory at Stevens Institute of Technology provided the venue for a series of model tests to assess surface towing stability of submarines for Global Dynamix, Inc. (www.gdynx.com), a Connecticut-based maritime technology distributor and sub-sea salvage R&D company.

During general transiting conditions, emergency conditions, and/or prior to decommissioning, naval submarines will need to be surface-towed to and from various locations.  However, submarines under surface tow often display undesirable tow characteristics such as yawing or extreme kiting to one side.  To circumvent adversity, submarines need to be cautiously and dexterously towed in a stable manner in both open ocean or through narrow water passages.

A 1/48 th scale Virginia Class submarine model with three interchangeable stern configurations, created by FX Models, was tank-tested to evaluate stability under surface-towing conditions. The test matrix included three different sterns, varying displacements and towline arrangements over a range of speeds up to 10 knots. The measurements included towline tension and horizontal deflection angle. The results indicated positional stability under a majority of tested conditions with large drift angles for the towline with all the control fins in their fixed locations. A stern down trim, which can be obtained by deploying the sternplanes with the leading edge down, was observed to provide towing stability throughout the speed range with minimum towline loads.

The Davidson Laboratory at Stevens, which celebrated its 75 th year in operation in 2010, has the largest wave tank complex of any U.S. university. It is one of the world's best known hydrodynamic and ocean engineering research centers, and has played a role in virtually every major maritime and coastal engineering advance, from developing the modern submarine to re-engineering the capabilities of the Apollo space capsules.

About Stevens Institute of Technology

Founded in 1870 and celebrating 140 Years of Innovation, Stevens Institute of Technology, The Innovation University TM , lives at the intersection of industry, academics and research.  The University's students, faculty and partners leverage their collective real-world experience and culture of innovation, research and entrepreneurship to confront global challenges in engineering, science, systems and technology management.

Based in Hoboken, N.J. and with a location in Washington, D.C., Stevens offers baccalaureate, master’s, certificates and doctoral degrees in engineering, the sciences and management, in addition to baccalaureate degrees in business and liberal arts.  Stevens has been recognized by both the US Department of Defense and the Department of Homeland Security as a National Center of Excellence in the areas of systems engineering and port security research. The University has a total enrollment of more than 2,200 undergraduate and 3,700 graduate students with almost 450 faculty. Stevens’ graduate programs have attracted international participation from China, India, Southeast Asia, Europe and Latin America as well as strategic partnerships with industry leaders, governments and other universities around the world.  Additional information may be obtained at www.stevens.edu and www.stevens.edu/news.