A study of the design and economic analysis of large diameter, slow-turning marine propellers to improve the fuel economy of merchant ships. Detailed design of several lightweight propellers were made. It was determined that the best combination for weight reduction is a cast hollow blade with 1 1/4 inch wall thickness and a hollow hub. Other investigations made were: fabrication techniques, resonant frequency effects, hydrodynamic characteristics, cascading effects and tip emersion effects. Costs and benefits as applied and tip emersion effects. Costs and benefits as applied to a 120,000 DWT Tanker are discussed allowing for both strict adherence to IMCO Rules of tip submersion and with a relacing of IMCO Rules. Strict adherence shows a maximum propeller diameter of about 30.2 feet with a resulting annual fuel savings of 1/4 million dollars over the 27.5' propeller. Relaxing these rules allows for a 42.5 diameter propeller turning at 30.8 RPM which would result in an annual fuel savings of one million dollars per year over the 27.5 propeller.
Large diameter propellers of reduced weight
Schiffsschrauben mit grossem Durchmesser in Leichtbauweise
US Government Reports ; Apr ; 1-204
1982
204 Seiten
Report
English
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