Abstract
Abstract: This study is on the development of 150PS inboard type of compact water jet propulsion system. The water jet is composed of intake, impeller, diffuser, reverse bucket and main shaft. Components of water jet have been manufactured through precision processing after sand casting. Development of water jet pro-pelled engine has been finally completed by processes which are design, production and inspection on each component. The water jet performance characteristics show that 0.29 m 3 /s of maximum flow rate and 37 m/s of flow velocity have been secured in the ground test pool. Field test was performed by 21ft test ship that water jet propulsion equipment developed in this study was installed. As a result, the weight of hull, engine and other parts of the ship has been almost 1.2 ton and 45 km/h of maximum sailing speed has been re-corded with 3700 rpm of engine in the domestic coast test. Keywords: Water Jet, Inboard, Propulsion System 1. 서 론 국내 소형선박의 경우 몰드(mould:선박외형)는 대부분 FRP(fiberglass reinforced plastics:유리섬유강화플라스틱)소재를 적용하여 제작하고 있는 실정이며, 그 외 엔진 및 기타 선박관련 부품은 수입에 의존하고 있는 경우가 많다. 현재 소형선박의 경우 90%가 8m 이내의 선박이며, 이 중에서 5~8m의 선박이 약 50%를 차지하고 있다. 또한, 추진기는 대부분 선외기를 적용하고 있다
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