Three foil sections with different thickness ratios are theoretically designed to delay cavitation inception and give high lift/ drag ratio. The thickness to chord ratios are 3.86%, 6.48% and 9.71%, respectively. Cavitation performance as well as noncavitating performance are examined by the noncavitating and cavitating foil theories, and by cavitation tunnel tests such as hydrodynamic force measurement and cavitation observation. From these test results, the foil performance and design method are evaluated as well as the accuracy of the theoretical prediction is discussed. It is found that the present designs have been successful.
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