Course Keeping Stability Model Tests of a USCG Notional Design of a 120 FT WPB Hull
Abstract
Directional stability tests were performed on a 1/18 scale model of the hull of a 120 ft WPB notional design. Captive model tests were performed to add to a data base of basic hydrodynamic information about planing hulls. This information is required for the study of the dynamic stability, course keeping, maneuvering and control of planing hulls. Straight course and rotating arm tests, at two radii, were conducted at the Froude scale equivalent of 12.5 and 35 knots. The two radii correspond to dimensionless angular velocities, L/R, of 0.206 and 0.412. The model was free to trim. The three force components and two moment components, as well as heave and trim, were measured. The yaw angle was varied from -6 to +12 degrees, in either 3 or 6 degree increments. The roll angle was varied from -10 to +20 degrees, in 10 degree increments. Most of the tests were conducted at a displacement corresponding to 135 long tons full size. Rudders were added and the appended hull tested on straight course and at an L/R of 0.206. Straight course rudder effectiveness tests were performed at rudder angles of 0 to 15 degrees in 5 degree increments. A limited number of bare hull tests were conducted at a displacement of 155 long tons, and at an L/R of 0.206. Underwater photographs and video recordings were made of all runs both on straight course and on the rotating arm,
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1998
- Accession Number
- ADA340724
Entities
People
- P. W. Brown
- Walter E. Klosinski
Organizations
- Stevens Institute of Technology