Relational 3D Modeling for Marine & Industrial Design
Donald L. Blount and AssociatesToday's guest hardly needs an introduction: Donald Blount is renowned worldwide for his accomplishments and contributions in the fields of naval architecture and marine engineering. As a naval architect, he creates designs which combine years of testing and experience with cutting edge technologies while constantly setting new industry standards. We are very pleased to present some of his and his company's work on our website.
Donald began conducting individual research and directing engineering
programs relating to emerging technologies in the field of hydrodynamics
at the David Taylor Model Basin. Then for three decades, he honed his
craft with the Department of the Navy, Combatant Craft Engineering
Department, serving the last nine years as department head.
DLBA’s technical achievements have been successfully demonstrated with the Blue Riband Award for fastest transatlantic passage won by Bravo Romeo Ltd.’s Destriero, the 67m gas turbine-powered vessel which averaged 53.1 knots during its non-refueled transatlantic passage (picture left, click on the thumbnail). The most recent DLBA design to hit the water is the latest Spanish Royal Yacht Fortuna, a 41.5m gas turbine-powered superyacht which has already reached 65 knots and is expected to exceed this. (Fortuna is featured in Volume 14 of The Superyachts book.)
These beautiful yachts were designed with the help of MultiSurf. Here is what DLBA designers have to say about the program: "The hull design is so critical to the overall performance of the vessel that only accurate calculations and analysis methodologies are used. With this in mind, MultiSurf is a wonderful tool. We have many important design criteria which must be considered on all our projects." Once these criteria are determined, and an outboard plan and profile of the vessel is agreed upon, the engineer or designer can immediately begin developing hull lines in MultiSurf. The large number of entities in the program and the excellent graphical user interface (GUI) allow for accurate 3D modeling of the hull lines to be achieved in a smart and efficient way. "Also, if the client has a change request, or requires design modification to an existing hull, the parametric nature of MultiSurf allows for specific changes to be made in a minimal amount of time, which is beneficial for both us and the client. Additionally, AeroHydro's Hydro program provides a simple and powerful tool in yielding hydrostatic analysis. MultiSurf allows for exact calculations of surface areas, weights, and center of gravity locations, which is integral in compiling detailed weight estimates. Many of our design criteria are based on weight estimate data."
DLBA's MultiSurf designs are directly compatible with computer-aided machining tooling and processes. A very productive working relationship exists between DLBA and Davis Boatworks of Wanchese, North Carolina. The latest project is a 70’ Sportfisherman. "Many Davis boats are offered with or without propeller tunnels, depending on their particular draft requirement. These propeller tunnels are a great application of the component feature in MultiSurf. Rather than developing the tunnel geometry from scratch each time they are required, a component can be imported and parametrically adjusted to suit the design requirements of the tunnels themselves and to ensure proper fit on the hull bottom."
In addition to MultiSurf, DLBA designers use the solid modeler SolidWorks together with its add-on surface modeler SurfaceWorks (another AeroHydro product), designing parts such as steering systems, propeller struts, helm units and consoles, sea chest inlets, machinery layouts, furniture, and complete deck design. SurfaceWorks helps as a go-between from MultiSurf to SolidWorks.
Robots at work