Abstract
The development of a computer program of an optimization hydrofoil design method using analytical empirical formulation is presented for dimensioning hydrofoil boats fully submerged and surface piercing foils, from a pre-designed high-speed craft. It is part of a design system coded from a methodology for high-performance craft design. The method and its coding are novel, since there are no known design methods or computer programs for hydrofoil dimensioning. The process fully integrates hull and foils, relieving the work and time spending of testing different foils and attitudes, as in CFD. It is straightforward and fast to vary foil configurations. It selects the optimum foil instead of just providing results for judgment. Results are produced in minutes, verifying several different foils, what would otherwise take days or weeks to do, with the same reliability in hydrofoil preliminary design. From the boat’s particulars, seastate, foils profile, material, and layouts, the aft and forward configurations are drawn to scale. The program determines the foils’ areas, chords, angles of attack, lift and drag forces as objective functions, subject to cavitation and structural strength constraints, solved for ranges of thickness–chord ratios and load factors. As results, several graphs and charts are presented by the program, such as the foils’ optimization, Lift and Drag, Angles of Attack vs Speed, Take-off Speed, Resistance and Power. Besides these features, the program is fully integrated with other ones of the design system. This program can help design any hydrofoil boat. A design example is shown.
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The authors wish to acknowledge Bjorn Salte, who developed in 2004 the spreadsheet this program was based on and Diogo F. Christo, who revised and upgraded it in 2017.
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Schachter, R.D., Fonteles, G.T. Preliminary design dimensioning of hydrofoil boats with fully submerged and surface piercing foils. Mar Syst Ocean Technol 17, 53–69 (2022). https://doi.org/10.1007/s40868-022-00113-2
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DOI: https://doi.org/10.1007/s40868-022-00113-2