Bill Parlatore PassageMaker Magazine
I believe that my Shannon 38 SRD hull design represents a significant breakthrough and will set a new standard in the marine industry for fuel efficient power boat design. There has never before been a power boat like the 38 SRD. This thirty eight foot SRD hull is a totally new design concept that achieves amazing fuel economy while combining great performance, shoal water and offshore capability.
SRD is an acronym for Schulz Reverse Deadrise. The aft hull sections of the 38 Beach Boat are radically different from all other powerboats which have convex or positive deadrise hull shapes. By inverting these aft sections on the 38 SRD, tremendous lift is produced, while the forward sections provide laminar flow that prevents suction. This revolutionary hull design (U.S. patent pending) enables the 38 SRD to reach speeds in excess of 25 mph with one half the engine horsepower of comparable powerboats. The SRD hull shape gives an exceptional flat ride plus excellent all-around performance in waters just 2 feet deep. The speed-to-horsepower ratios and fuel economy of the 38 SRD are extraordinary when compared to semi-displacement and deep V hulls, making the 38 SRD truly unique. With only twin 150HP diesels, the prototype reached a top speed of 21 knots and cruised at 18 knots burning only 11 gallons an hour total, for a fuel burn of about two miles to the gallon. Deep V and trawler hulls at their best use one gallon per mile, and water jet boats obviously burn even more fuel than that. The range of the Shannon 38 SRD with standard tankage is over 500 miles. For those interested in even more economy and range, the 38 SRD was also designed to accommodate surface peircing propeller drivers, a truly 21st Century solution.
Since 70% of the coastal cruising waters from Eastport, Maine to Brownsville, Texas average only 3 feet deep, the 38 SRD with 24 inch draft opens whole new cruising areas to be enjoyed. During the 1990's, the marine market saw a dramatic acceptance of water jet boats touting the virtues of shoal draft boating. The 38 SRD gives the same opportunity to enjoy shallow water without the extra fuel burn, mechanical complexity, difficulty in handling, and high annual maintenance costs of water jet power.
For styling, I looked to create a modern yet traditional profile featuring design elements from classic motor yachts combined with the look of the 21st century. In no way did I want the 38 SRD to look like just another express cruiser or picnic boat. For the interior plan, I looked to achieve maximum accommodations and the proper utilization of space, my goal in all the Shannon sail and motor yachts that I have designed over the last 30 years.
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