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Message: <blockquote data-quote="Jdero620" data-source="post: 488753" data-attributes="member: 31696">Not sure the anatomy of an OB exactly, (as im sure you can tell by now), the lowest plate sits probably 1-2 below the bottom of the boat, while the top plate is about 3 above the bottom and skims the surface of the water on plane. 5" or so between them. Not sure how to add a pic, as its not allowing me to drag one off the desktop. Google BF20D and you'll notice a bottom plate just above the prop, and one of a similar shape facing backwards. Appears the bottom plate is anti vent, whats the upper one about then?</blockquote>