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PROPELLER EXCITED VIBRATORY FORCES FOR NS SAVANNAH DERIVED FROM MODEL WAKE SURVEY

Propeller forces and moments induced by the nonuniform inflow velocities into the propeller plane of the N.S. Savannah are calculated from a wake survey conducted on a model of the ship at a displacement corresponding to 16,200 tons and at a speed corresponding to 20.5 knots. A harmonic analysis of the wake was made for the longitudinal and tangential velocity component ratios. The analysis indicated that the seventh harmonic (seven blades) has the smallest relative harmonic amplitude. The magnitude of the thrust fluctuation in percentage of the mean thrust amounted to 18.0 percent double amplitude D.A. at 20.5 knots. The torque fluctuation in percentage of the mean torque amounted to about 15 percent D.A. at the same speed. The eccentricity factor e/D is close to those of other surface ships.

  • Supplemental Notes:
    • This document is available for review at the Department of Commerce Library, Main Commerce Building, Washington, D.C., under reference number DTMB-LTR-962.
  • Corporate Authors:

    David Taylor Model Basin

    Department of the Navy
    Washington, DC  United States 
  • Authors:
    • Hinterthan, W B
  • Publication Date: 1964-9-9

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 35 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00026631
  • Record Type: Publication
  • Source Agency: Maritime Administration
  • Files: TRIS, USDOT
  • Created Date: Feb 14 1973 12:00AM