Lift and Drag Characteristics of NACA 16-309 and NACA 64A309 Hydrofoils.
Abstract
Lift and drag data were obtained by the David W. Taylor Naval Ship Research and Development Center (DTNSRDC) for two NACA foil shapes geometrically similar to the forward foil system of the PCH hydrofoil craft. The NACA foil shapes were the 16-309 (presently used on PCH) and a modified 64A309 section. Information was obtained for flap angles up to 17.5 degrees and pitch angles up to 12 degrees. There was good agreement between similar measurements made in the High-Speed Tow Facility and in the Rotating Arm Facility. Experimental results indicate that the 64A309 foil can achieve a higher lift-to-drag ratio than the 16-309 foil. Although the angle of pitch at which cavitation inception occurred was approximately the same for the two foils, the inception occurred at a higher lift for the 64A309. The 64A309 section produced more lift with changes in flap angles than did the 16-309 section. Flap effectiveness decreases at the larger flap angles as velocity is increased. Depth of submergence of the foils noticeably influenced lift and drag, particularly at depths less than one chord length of the foil. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1976
- Accession Number
- ADA032272
Entities
People
- David W Taylor
- Douglas E. Layne