Abstract
The necessity for designing for eavi La Lion-free opera Lion on a proposed subcavi tali tig hydrofoil craft has ted to considerable research effort into the study of hydrofoil cavitation. Six NACA 16-series foil sections were investigated theoretically by a method developed at the Bureau of Ships to obtain cavitation boundaries for a three-dimensional foil-pod system. In order to carry out a more complete parametric study quickly, two-dimensional cavitation buckets for these six NACA 16-series sections developed by the Abbott method for obtaining pressure distributions have been factored to collapse onto the buckets obtained by detailed calculations. With the factors obtained, a large number of sections were evaluated for a cruising depth of 2.5 ft, and a foil selection chart has been developed. Hydrofoil section NACA 16-407 was selected for both main and stern foils on the proposed craft after considering the relationships between foil loading and hydrodynamic drag, and also Cz, range, uncavitated, within the bucket, and rough-water performance and turning characteristics. To make this chart usable for the preliminary design of other hydrofoil craft, the effects of foil depth of immersion, sweep, and taper ratio on the cavitation buckets have been briefly investigated.
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