Taken from a Facebook page.
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PacificStar said..
that's gota a be photoshop...surely no-one would be that stupid ?
cheers,
The comments went on to say that it was a Catalina design and was useful to give rudder authority when the boat was rounding up..
I gave up reading the page to know how many models where built like this or even if it was successful. My Catalina certainly didn't have this design rudder.