Accession Number : ADA309350

Title :   Side-By-Side Seakeeping Tests of the USCGC PADRE (WPB 1328) and the USCGC SHEARWATER (WSES 3).

Descriptive Note : Final rept.,

Corporate Author : COAST GUARD RESEARCH AND DEVELOPMENT CENTER GROTON CT

PDF Url : ADA309350

Report Date : APR 1996

Pagination or Media Count : 58

Abstract : This report contains the results of a limited set of side-by-side seakeeping tests using the USCGC PADRE (WPB 1328), a semi-planing monohull, and the USCGC SHEARWATER (WSES 3), a surface effect ship (SES). The objective was to obtain data that would allow the ride quality of the two boats to be compared. A short side-by-side test drifting in beam seas was followed by two sets of underway tests. Underway tests were performed at 15 knots in 3.2 ft. seas, and at 18 knots in 3.7 ft. seas, at five headings to the sea: head, bow, beam, quartering, and following. A waverider buoy was used to measure sea state. A Humphrey, Inc. motions package was installed in each boat. Roll, pitch, and yaw angle, roll, pitch and yaw rate, and heave, surge, and sway acceleration measurements were recorded and analyzed. The results of the analysis are presented in graphs and tables. Based on limited data taken at moderate speeds in low sea states, there was little difference between the motions of these two patrol boats while underway. The monohull rolls much more than the off-cushion SES while drifting in beam seas.

Descriptors :   *SEAKEEPING, *SURFACE EFFECT SHIPS, *PATROL CRAFT, *COAST GUARD SHIPS, ANGLES, MEASUREMENT, OCEAN WAVES, YAW, ACCELERATION, GRAPHS, MOTION, RATES, DRIFT, BOATS, SEA STATES, BUOYS, RIDE QUALITY.

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE