Report 4 outlines the methodology and results of the full-scale research tests investigating candidate hull forms.  An outline of the approach to evaluation and optimization of the Teknicraft foil-assisted catamaran (FAC) design by means of computational fluid dynamics modeling is also provided.  This report is released as a draft interim report.  A final report shall be issued following completion of computational fluid dynamics (CFD) optimization studies scheduled for January 2008.

Vessel wake trials have been conducted in this study with two FACs designed by Teknicraft Inc., NZ and by two air cavity/surface effect type vessels designed by M Ship Co. of San Diego, CA.  The vessel wake trials are providing data for calibration and validation of wake transformation models (described in Report 2). 

Vessels tested in wakewash and performance trials, clockwise from top left Spirit, 1060, M80 Stiletto, M38

Shore impact studies conducted in Rich Passage with the FAC Spirit indicated that the vessel design shows considerable promise as a low-impact POFF alternative.  However, the results suggest that further benefits could be gained by the use of an adjustable foil.  Therefore, trials were conducted with the vessel 1060 in February 2006 to assess the potential benefits of utilizing an adjustable-foil catamaran design for a low-wake passenger ferry.  A new research vessel (RV2), presently under development as part of the research program, will be based on Spirit and 1060, but optimized to minimize resistance and wake generation.  A CFD modeling study is being conducted to assist in the design of this second research vessel.

M Ship Co. is a California based company specializing in innovative design of high speed, low wake vessels employing surface effect (air-cavity hull) design elements.  Several of their designs have been identified as having a very high potential for low wake generation at high speeds.  A series of full scale wake wash and vessel performance tests were conducted in San Diego in November 2006 with the two available prototype scale M-Hull vessels: specifically the M80 Stiletto, and the M38 prototype.  It was found that wake energy decreased significantly with vessel speeds above the hump speeds.

Wake Trial and Low Wake Vessel Optimization

Seattle- Bremerton

Passenger Only Fast Ferry Study