liferaft; drogue; drift; series drogue; breaking waves; steepness
The present report documents a test series conducted in the towing tank on life raft drift, towed life raft resistance and towed drogue resistance. These complimented a series of tests conducted by Fleet Technology Limited dealing with the capsize of a 1:7 scale model of a 20 person life raft. Towed resistance experiments conducted on standard drogues at full scale and 1:5, 1:7 and 1:9 scales. Experiments with series drogues (consisting of up to 40 cones in series) were conducted at full scale, at 1:7 scale and for an oversized full scale drogue design. Towed resistance experiments were conducted on a full scale 16 person life raft and on a 1:7 scale model of a 20 person raft. Wind drag experiments were also conducted for a range of canopy orientations relative to the wind direction. Life raft drift experiments were performed with the 1:7 model for 0.35 and 0.75 in regular waves with 1:15 and 1:7 steepness to simulate breaking wave conditions.
National Research Council of Canada. Institute for Marine Dynamics
St. John's, Newfoundland, Canada
Contractor Report (National Research Council of Canada. Institute for Marine Dynamics), no. CR-1997-08 (1997).