The ornamental design for a propulsionunit for ships and boats, as shown and described.
FIG. 1 is a perspective side view of a propulsion unit for ships and boats.
FIG. 2 is a front side view of the propulsion unit shown in FIG. 1.
FIG. 3 is a back side view of the propulsion unit shown in FIG. 1.
FIG. 4 is a top side view of the propulsion unit shown in FIG. 1.
FIG. 5 is a bottom side view of the propulsion unit shown in FIG. 1.
FIG. 6 is a right side view of the propulsion unit shown in FIG. 1; and,
FIG. 7 is a left side view of the propulsion unit shown in FIG. 1.
The broken lines showing the propeller blades are for the purpose of illustrating portions of the propulsion unit for ships and boats that form no part of the claimed design.