| 摘要 |
<p>1,142,895. Propelling ships. WESER A.G. 7 Dec., 1966 [7 Dec., 1965], No. 54837/66. Heading B7V. The propulsive efficiency of propeller driven marine vessels is increased by the artificial generation of axial vibrations acting on the tailshaft which produce spurious variations of thrust independent of the pattern of the flow velocity to the propeller, the phase, amplitude, frequency and frequency variation of which vibrations can be controlled.</p> |
