| 摘要 |
PCT No. PCT/FI97/00028 Sec. 371 Date Jul. 23, 1998 Sec. 102(e) Date Jul. 23, 1998 PCT Filed Jan. 23, 1997 PCT Pub. No. WO97/27102 PCT Pub. Date Jul. 31, 1997The invention relates to a method and apparatus for installing a propeller assembly in an opening in the bottom of a swimming vessel and for removing the propeller assembly from the opening. The propeller assembly comprises an underwater section including the actual propeller and a top section inside the vessel, between which is fitted a flange element for tightly sealing the opening. The apparatus comprises a hoisting chamber, which is fitted in the opening in the bottom of a vessel, extends inside the vessel to above waterline and surrounds the top section of the propeller assembly. The apparatus further includes guide elements for guiding the propeller assembly during the course of lifting or lowering. In the method, the propeller assembly is lifted away by way of the top of the hoisting chamber after clampings of the propeller assembly to the hull of a vessel are unfastened and hoisting means are secured to the propeller assembly. Installation proceeds in a reversed order.
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