Originally Posted by Capt. Bill11
What is the square partially filled opening on the right side of the picture all about? The original attempt to inject air?
Half way up the right hand side of the picture is the attachment point of the strut to the hull. I'm not quite sure what to call this strut, but it's the strut that holds the bearing inside which the prop shaft turns.
In this picture, in case it isn't clear, the bow of the boat is off to the right, the stern to the left, starboard at the top, and port at the bottom. Between the blades of the prop, the port rudder post can be seen, but the port prop is not visible. The port strut (ahead of the port rudder post) is partially visible.
The similar set of holes above the port prop is not visible, because the keel between the props blocks them from view, although this is not terribly obvious from the picture.