Analysis Design Results of Kort Nozzle on Yamaha 15 HP Outboard Motor Propulsion System Towards Increasing Ship Speed

Use of Yamaha outboard motors There are very many small farmers (tuna fishermen) with a capacity of 1.5 GT in the Leahari country, South Leitimur sub-district, Ambon city. Apart from being used for fishing, it should also be used to sell the catch to the receiving company, but in reality the sales process to the company uses a rental motorcycle taxi. One of the factors that need to be considered in the process of planning and building a ship is a good propulsion system, the propulsion system itself is Propeller design planning. Propeller is one aspect that must be planned properly in order to achieve the purpose of the ship's function in terms of speed. Propeller that uses a kort nozzle is called a ducthed propeller. The phenomenon that occurs in propeller enclosed in a tube (kort nozzle) is that the velocity of the water flow inside the tube is faster than the flow of water outside the tube resulting in lower pressure inside the tube than the pressure outside the tube. . This pressure difference results in an additional thrust (thrust). In this study, the method used is experimental and statistical tests in which the author will examine the use of a kort nozzle on the Yamaha 15 HP outboard motor propulsion system which is expected to increase the speed of the ship so that fishermen can use vessel to sell their tuna catches to receiving companies.