The Leeway of an Open Boat and Three Life Rafts in Heavy Weather

A field test of the leeway of three search and rescue (SAR) craft was conducted during November-December 1995 by the U.S. Coast Guard Research and Development Center and the Canadian Coast Guard. The experiment was conducted on the Grand Banks of Newfoundland. The SAR craft included a 5.5 meter wood...

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Bibliographic Details
Main Authors: Allen, Arthur A., Fitzgerald, Reginald B.
Other Authors: COAST GUARD RESEARCH AND DEVELOPMENT CENTER GROTON CT
Format: Text
Language:English
Published: 1997
Subjects:
Physical and Dynamic Oceanography
Marine Engineering
*DRIFT
*BOATS
*LIFE RAFTS
FIELD TESTS
WIND DIRECTION
WIND VELOCITY
STATISTICAL ANALYSIS
CURRENTS
SEARCH AND RESCUE
COAST GUARD RESEARCH
CROSSWINDS
*LEEWAY
*LEEWAY MEASUREMENTS
*ISARC(IMPROVEMENTS TO SEARCH AND RESCUE CAPABILITIES)
Canada
Dunlop
Newfoundland
Online Access:http://www.dtic.mil/docs/citations/ADA338829
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA338829
Description
Summary:A field test of the leeway of three search and rescue (SAR) craft was conducted during November-December 1995 by the U.S. Coast Guard Research and Development Center and the Canadian Coast Guard. The experiment was conducted on the Grand Banks of Newfoundland. The SAR craft included a 5.5 meter wooden-planked open boat common to the Newfoundland area and two versions of the Switlik 6-person marine life raft. In addition, leeway data for a Dunlop-Beaufort 4-person life raft collected during a prevous experiment were reanalyzed. During the course of the drift period, all leeway craft swamped or capsized. This report summarizes statistical analyses of both the pre- and post- swamped/capsized portions of the data records. The leeway speed of the 5.5m wooden open boat decreased from 3.65 to 1.73 percent of the 10m wind speed after swamping. The leeway speed of the Switlik life raft with a full ballast bag and drogue decreased from 1.95 to 0.79 percent of the 10m wind speed after swamping. The leeway speed of the Switlik life raft with four small ballast bags and drogue decreased from 2.82 to 1.13 percent of the 10m wind speed after capsizing. The leeway speed of the Dunlop-Beaufort life raft with a drogue and four man loading decreased from 1.93 to 0.89 percent of the 10m wind speed after capsizing. Prepared in collaboration with Oceans Limited, St. Johns, Newfoundland, Canada.

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