LARGE DIAMETER PROPELLERS OF REDUCED WEIGHT

This is a study of the design and economic analysis of large diameter, slow-turning marine propellers to improve the fuel economy of merchant ships. Detailed designs 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 to a 120,000 dwt tanker are discussed allowing for both strict adherence to IMCO Rules of tip submersion and with a relaxing 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'-foot propeller. Relaxing these rules allows for a 42.5'-foot 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'-foot propeller.

  • Supplemental Notes:
    • Report
  • Corporate Authors:

    Webb Institute of Naval Architecture

    Glen Cove, NY  United States 

    Maritime Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Hadler, J B
    • Neilson, R
    • Rowen, A
  • Publication Date: 1982-4

Media Info

  • Features: References;
  • Pagination: Various p.

Subject/Index Terms

Filing Info

  • Accession Number: 00660467
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Contract Numbers: MA-80-SAC-01061
  • Files: TRIS, USDOT
  • Created Date: Jul 21 1994 12:00AM