Tug or 'water tractor'; has drive in prow and roller in stern, which is vertically mounted and rotates about longitudinal axis and has roller drive and has rudders upstream of roller

摘要

The tub has a drive (1) in the prow and a roller (3) in the stern, which is vertically mounted and rotates about its longitudinal axis. The roller is assigned to a roller drive. One or more rudders are arranged in the area of the longitudinal central plane or outside the tube, upstream of the roller. The roller may alternatively be inclined to the vertical. The roller may be in one piece with the rudder or supported by it.