| 摘要 |
A barge having fore and aft propellers respectively mounted in longitudinal tunnels has bottom intake and discharge respectively forward of their associated propellers and has combination intake and discharge ports at the outboard ends of said longitudinal tunnels. The respective end ports are guarded against entry of debris by a plurality of vertical vanes movably mounted to swing around their respective vertical axes for additional steering purposes. Respective transverse tunnels having combination intake and discharge side ports at their outer ends and joining the respective longitudinal tunnels at their inner ends are located forward of the aft propeller and aft of the forward propeller. Side ports are protected by grills to prevent entry of debris. Vertically installed valves are mounted in the respective tunnels adjacent the respective propellers for opening and closing the tunnels individually. Horizontally installed valves are mounted in the bottom intake ports for similar purposes. Extendable fins are recessed into the fore and aft sides of each side port, the forward side fins being extendable slanting aft and the after side fins forward for directing the flow therefrom. The placing of the bottom ports forward of their associated propellers enables the barge to lift and dig itself free if it should ever run aground. The extendable fin mounted adjacent the side ports assist in sterring the barge. The propellers are driven by engines that can also be remotely controlled. A radio antenna can receive control signals and electronically controlled machinery can be adapted to actuate all movable parts.
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