| 摘要 |
<p>The main purpose for this invention is to provide an effective steering device for manoeuvring a boat in narrow passages e g when docking at a quay.</p><p><Paragraphs id="pa02" num="0002" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">The most common arrangement with a conventional boat bottom is that the propeller and propeller house is placed in a thruster tunnel open to both sides of the boat below the water surface.</p><p><Paragraphs id="pa03" num="0003" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">With more modem boats having a shallower hull profile a more effective solution is to have the propeller assembly lowered down through a recess in the hull bottom in order for it to be able to be below the water surface when required.. This is done by swinging the propeller assembly through a recess in the bottom of the boat as shown in fig 1.</p><p><Paragraphs id="pa04" num="0004" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">This invention (in fig 1) fulfils the demands described above by having a propeller assembly (1) with a propeller (3) driven by a motor and placed at each end of a carrying arm (4) which is mounted in a pi fixture (A-A) (fig4) with pivoting axles (6) and which therefore can be swung down through the bottom of the boat and placed under the water surface.
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