AV plate on 20' Seafari
My AV plate 1.75" above keel was pretty good on my ETEC 150 HO powered 20' Seafari with a 5 blade High Five prop, but when I redid the transom last year raised it to about 2.375" from keel to bottom of AV plate. A better position; a little more WOT RPM, better steering feel on my non-feedback, mechanical steering, perhaps a little more bow rise and porpoise tendency sometimes (which will be fixed by trim tabs). One of my barefoot friends likes to run at about 44 mph. Before the transom redo could get him to about 41 MPH GPS speed on a boom and full length bimini up.
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