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.


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    Title :

    Large diameter propellers of reduced weight


    Additional title:

    Schiffsschrauben mit grossem Durchmesser in Leichtbauweise


    Contributors:
    Hadler, J.B. (author) / Neilson, R. (author) / Rowen, A. (author) / Sedat, R. (author) / Zubaly, R. (author)

    Published in:

    Publication date :

    1982


    Size :

    204 Seiten


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English




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