<?xml version="1.0" encoding="UTF-8"?> <article key="pdf/3161" mdate="2009-06-28 00:00:00"> <author>K. D. Ro and J. T. Park and J. H. Kim</author> <title>Hydrodynamic Characteristics of Weis&amp;ndash;Fogh Type Ships Propulsion Mechanism Having Elastic Wing</title> <pages>684 - 689</pages> <year>2009</year> <volume>3</volume> <number>6</number> <journal>International Journal of Aerospace and Mechanical Engineering</journal> <ee>https://publications.waset.org/pdf/3161</ee> <url>https://publications.waset.org/vol/30</url> <publisher>World Academy of Science, Engineering and Technology</publisher> <abstract>This experiment was conducted in attempt of improving hydrodynamic efficiency of the propulsion mechanism by installing a spring to the wing so that the opening angle of the wing in one stroke can be changed automatically, compared to the existing method of fixed maximum opening angle in WeisFogh type ship propulsion mechanism. Average thrust coefficient was almost fixed with all velocity ratio with the prototype, but with the spring type, thrust coefficient increased sharply as velocity ratio increased. Average propulsive efficiency was larger with bigger opening angle in the prototype, but in the spring type, the one with smaller spring coefficient had larger value. In the range over 1.0 in velocity ratio where big thrust can be generated, spring type had more than twice of propulsive efficiency increase compared to the prototype.</abstract> <index>Open Science Index 30, 2009</index> </article>