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I've seen a couple of other boats with an off-set prop like that. I think the idea is to have the shaft angled out to port a bit to counter the tendency of an off-set prop on the port side to yaw the boat to starboard, and to allow placing the engine along the centerline of the hull. Of course, under sail the drag would make the boat yaw a boat to port a bit.
As to why they didn't just install a shaft log along the center line, besides the possible easier installation (since you don't have to drill through the keel itself), if you look closely this set-up allows for greater prop clearance w/o having to angle the the shaft down at a much greater angle. Its a trade-off that might well make sense in some designs.
Edit: D'oh!! msmith beat me to it by one minute!! (I gotta start typing faster.)
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