Propulsion Device for a Boat

FIG. 1 is a perspective view of the invention; FIG. 2 is a front view thereof; FIG. 3 is a rear view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a top plan view thereof; and, FIG. 7 is a bottom plan view thereof. The broken line shown in the drawings are for the purpose of illustrating portions of the propulsion device for a boat and form no part of the claimed design.