Patent ID: 7845997

Claim:
A boat-propelling machine for attachment to a boat hull, comprising: a lift force generation device generally comprising a plate-shaped structure; an outer vertical wall unit extending upwardly to a region above at least a draft line during planing travel of the boat and dividable into separately formed port-side and starboard-side vertical wall members, the port-side vertical wall member of said outer vertical wall unit including a port-side section of the plate-shaped structure of said lift force generation device, the starboard-side vertical wall member of said outer vertical wall unit including a starboard-side section of the plate-shaped structure of said lift force generation device; and port-side and starboard-side supports extending rearwardly from respective port-side and starboard-side vertical wall members of said outer vertical wall, and connecting to at least a rear portion of respective port-side and starboard-side sections of the plate shaped structure of said lift force generation device, the port-side and starboard-side portions of said outer vertical wall unit being located above, the port-side and starboard-side sections of the plate-shaped structure of said lift force generation device.