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Effects of the Hull Vane®’s submerged elevation on seakeeping performance are studied. As a case study, the Orela planning-hull crew boat is considered. Three foil’s submerged elevations are investigated: h/T = 1.5, 1.0 and 0.75, where h is the submerged elevation and T is the design draft. Model tests were done and the experimental data were verified using results of numerical simulation. In all cases, the Hull Vane® results in a decrease of both the heave and the pitch responses. For a sailing boat with 22-knots speed (Fr = 0.57) in sea state 4 head seas, the decrease of heave rms reaches 18.9% and the decrease of pitch rms reaches 20.4%. Furthermore, for the same ship speed, the shallower the foil’s submerged elevation, the smaller the decrease of the heave response but the larger the decrease of the pitch response, compared to the case without foil.

Hull-Vane® Submerged-Elevation Optimization for Improved Seakeeping Performance: A Case Study of an Orela Crew Boat