Propeller chart analysis has been substantiated by full-scale trials on existing vessels, in both free-running and towing conditions; from these trials wake fractions and thrust deduction factors were obtained; over range of propeller diameters considered there is continuous economic improvement as diameter increases; use of propellers of maximum size would achieve net annual saving, taking account of capital depreciation, between 10% and 15% of annual fuel costs, etc; it is suggested significance of study is that improvement has been expressed in economic terms, leading to design recommendations. (02279)
Controllable pitch propellers in large stern trawlers
Trans Inst Marine Eng
1968
24 pages
Article (Journal)
English
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