Low-resistant hydrofoil.

摘要

A low-resistant hydrofoil (1) comprises at least one concave step (2) arranged backwardly in the direction of a chord of blade of the hydrofoil in parallel with the leading edge of the hydrofoil to form a lamellar cavitation layer (3) on the negative pressure surface of the hydrofoil moving under water. The concave step has depth DELTA t and DELTA t/C is more than 0.001 and less than 0.01, c being a chord length. The concave step is 0 <x1/C <0.1, x1 being a distance from the leading edge of said hydrofoil and C being a chord length.