EVENT DESCRIPTION
Over 25 years of R&D into the effects of hull appendages for the reduction of vessel resistance through constructive wave interference. Work has focuses on bow bulbs to modify the bow wave, midship bulbs to modify the midship hollow, and a stern bulb to modify the stern wave. The original premise was that waves are a graphic presentation of the pressure patterns on the hull. It takes power to create the waves. Any reduction in the wave train would be a reduction in power required to move the vessel through the water. This has proven to be the case with resistance reduction of up to 26% achieved over the bare hull with potential to achieve over 30% reduction. That would be 30% smaller engines, 30% less fuel tankage, 30% less emissions, and less noise. Certainly, a goal worth pursuing.
SPEAKER/PRESENTER
Patrick J. Bray, Naval Architect, P.L. Eng.
With more than 50 years of experience in custom vessel design, our speaker has led the development of yachts and commercial vessels ranging from 12 to 45 metres, and is recognized for pioneering fuel‑efficient, long‑range motoryachts. His work includes hull‑form optimization for the Canadian Navy’s 33‑metre Orca Class patrol vessels, advanced research into high‑speed craft, SWATH vessels, and over 25 years of R&D focused on hydrodynamic resistance reduction through bulbous bow, midship, and stern designs. This research has involved extensive test‑tank programs and CFD analysis in collaboration with the National Research Council of Canada. He has served as shipyard naval architect for major yacht and commercial builders, overseen class‑compliant construction, received international design awards, published widely in technical journals, taught naval architecture and boatbuilding, mentored university students, and provides stability and inclining services for yachts and commercial vessels under Transport Canada regulations.
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