| 摘要 |
PURPOSE: A propeller with double cross sections is provided to increase speed and to prevent erosion due to cavitation by always generating the stable cavitation in sailing. CONSTITUTION: A propeller with double cross sections comprises a normal cross section part(1) and a super cavitating cross section part(2). The normal cross section part has a streamlined cross section. The super cavitating cross section part has a wedge cross section. If the length from a central shaft of a thrust shaft(3) to the end of a propeller is supposed as 100%, the normal cross section occupies the 70% of the length. The super cavitating cross section part occupies the rest 30% of the length. [Reference numerals] (AA) Wedge cross section; (BB) Streamlined cross section |
