| 摘要 |
A raft (10) is to be towed after a vessel in connection with seismic measurements of the sea bottom. A water flow passage (38) is formed mainly between two side hulls (11, 12) and an upper, front deck (22, 23) and guide surfaces for defining longitudinal rearwardly directed water guide ducts. On the under side of the side hulls (11, 12), from a distance behind their front ends to the rear end of the raft, longitudinal water guide ducts (17) are arranged for leading separate water currents parallel to the water flow passage (38) between the side hulls. At the front end of the raft (10) a middle hull (13) is arranged, which divides the water flow passage (38) between the side hulls (11, 12) into two current portions. At a distance behind the rear portion (13b) of the middle hull, a middle, elongate water guide duct (14) is arranged for collecting parts of the current portions for a course through the middle water guide duct. |
