THE EFFECTS OF VARIATIONS OF SEVERAL PARAMETERS ON THE WAKE IN WAY OF THE PROPELLER PLANE FOR SERIES 60-0.60 CB MODELS.
Abstract
The report presents the results of a series of wake surveys conducted on Series 60-0.60 CB models with three different afterbody configurations. These tests were conducted with variations of the following parameters: speed, propeller position, displacement, trim, and deadwood area. This presentation includes the circumferential distributions of the longitudinal, tangential, and radial velocity component ratios; the radial distribution of the mean velocity component ratios; the radial distribution of the volumetric mean wake velocity ratio; the radial distribution of the amplitudes of the harmonics of the longitudinal and tangential velocity component ratios; and the radial distribution of the pressure factor and of the mean advance angle and the maximum positive and negative variations thereof. The most pronounced effect was achieved by removing a portion of the deadwood in way of the stern aperture. This alteration yielded a higher mean longitudinal velocity while reducing the harmonic amplitudes. The displacement and speed also had an effect on the wake distribution. The testing of the moderate U-and V-shaped sterns, however, did not indicate changes of the magnitude that were anticipated. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1969
- Accession Number
- AD0690097
Entities
People
- Alan C. M. Lin
- Jerald W. Grant