HYDRODYNAMIC LOADING COEFFICIENTS FOR THE AGEH-1 MAIN STRUT-POD-FOIL SYSTEM AS DERIVED FROM THE 1975 FLAP INCIDENCE CONTROL EXPERIMENT

As part of an investigation into minimizing control power requirements for hydrofoil craft, a technique has been developed for obtaining complete hydrodynamic lift and moment characteristics of a flapped hydrofoil from equilibrium data obtained in flap incidence control experiments with a freely pivoting foil. This method employs a simple mathematical model and various crossplots of the data to separate the effects of camber, foil incidence angle, and flap angle using a minimum amount of data. Existing model data for the AGEH-1 main strut-pod-foil system under subcavitating conditions have been analyzed by this method, and effects of depth and velocity are described. Velocity effects were attributed to air and/or water flow out of the pod. Relatively high values of flap lift effectiveness (0.3 to 0.4) were obtained. Centers of pressure (lines of action) for lift due to camber, angle of attack, and flap angle are presented. Recommendations are given for improving the accuracy of the measurement and analysis techniques. (Author)

  • Corporate Authors:

    David Taylor Naval Ship R&D Center

    Ship Performance Department
    Bethesda, MD  United States  20084
  • Authors:
    • Coder, D W
    • Layne, D E
  • Publication Date: 1978-5

Media Info

  • Pagination: 87 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00191571
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: DTNSRDC/SPD-0332-05 Dept. Rpt.
  • Files: TRIS
  • Created Date: May 26 1979 12:00AM