Ship propeller designing

U ovom je radu je opisan postupak projektiranja brodskih vijaka. Navedeni su i opisani parametri koji nam služe za projektiranje vijaka. Dana je općenita podjela brodskih propulzora i njihove najvažnije karakteristike, kinematička svojstva, geometrija vijka. Utjecaji kavitacije na brodski vijak te oštećenja vijka i njezin utjecaj na iskoristivost vijka. U eksperimentalnom dijelu završnog rada je pokazano ispitivanje projekta vijka pomoću dijagrama serija Wegininškog bazena, ispitana je geometrija vijka ELICHE RADICE B6 za ribarski brod Majka Marija uz pomoć Prop Scan tehnologije i uviđene su razlike u izmjerenim vrijednostima i onima zadanima tvorničkim projektom vijka. Na brodu Naše more posebnim programom je izvršena korekcija brodskog vijka i prikazano je poboljšanje specifikacija broda nakon zahvata korekcije vijka i usporedba sa starim parametrima. Prikazan je projekt vijka za bulk carrier izgrađen u Splitskom brodogradilištu. Proračunom je izabran najoptimalniji vijak, ispitan brodski motor , buduće performanse broda te rizik od kavitacije i doneseni su zaključci na osnovu ispitivanja.This paper describes the procedure for designing ship propellers. The parameters used to design the screws are listed and described. General classification of ship propulsors and their most important characteristics, kinematic properties, propeller geometry are given. The effects of cavitation on the ship's propeller and its effect on the propellers usability. In the experimental part of the paper, a srcew design test was performed using the Wegeningen basin series diagram, the geometry od ELICHE RADICE B6 for Majka Marija fishing vessel was tested using Prop Scan technology and differences in measured values and those given by the factory screw design where observed. On the ship Naše more a special program was made for the correction of the ship's bolt and the improvement of the ship's specifications after the operation of the correction of the bolt and comparasion with the old parameters. The project is shown for a bulk carrier screw built in a Split shipyard. The most optimal screw was selected in the calculation, the marine engine was tested, future performance of ship was examined , the risk of cavitation and conclusion were reached on the basis of the examination