Subcavitating hydrofoil sections with thickened trailing edges offer potential advantages of greater structural rigidity and delayed cavitation inception. In order to evaluate this concept two foils were tested in the M.I. T. water tunnel, one with a relatively thick trailing edge (2% of chord) and the other with a conventional sharp edge. Both foils were designed to develop a lift coefficient of 0.20 and incorporate near-optimal chordwise distributions of loading and thickness. This paper presents measurements of lift and drag as functions of incidence and Reynolds number, as well as surface cavitation inception, and near wake velocity surveys. Data for the thickened foil fitted with a beveled trailing edge and with a splitter plate are also given. These results are compared with analytical predictions, taking account of tunnel boundary effects. Recommendations are offered for further analytical and experimental research.

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