| 摘要 |
The object of the invention consists of a pair of retractable hull appendages to be installed on planing crafts, having the shape of planes or tables or fins placed astern, parallel to the port and starboard sides capable, when lowered, to create a lifting force in correspondence to the area astern of the boat. <??>Such action is derived from the appendages which function as a barrier in order to prevent the fluid threads flowing under the keel from escaping sideways, thus creating a water pressure rise under the stern. <??>The invention enables the boat to plane easily with less power involved, as a consequence of the reduction of the passive forces of resistance to the water caused by all trim control systems in use today. <??>Moreover, the compression of the fluid water threads under the keel enables the boat to acquire better propulsion. <??>Note: It is proposed that this abstract be published together with fig. n DEG 5 <IMAGE>
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