| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pre-nozzle for drive system of a water craft for further improving a drive efficiency of low speed mass ship. <P>SOLUTION: A propellerless pre-nozzle 10a of a drive system for a water craft, which has an inlet aperture and an outlet aperture, fin systems 14a to 14e installed within these, and has not the fin systems 14a to 14e in inlet regions of the inlet aperture and outlet aperture, wherein the pre-nozzle 10a is composed in rotary asymmetry so that the drive efficiency may be further improved. <P>COPYRIGHT: (C)2012,JPO&INPIT |
