Unlike regular tabs that have a flush or upturned 90 deg. bend on each side of the tab The drop fins have a "Down" turned 90 deg.bend on each side of the tab. The down turned edge depth of the bend is also much deeper (about 3")
It increases the trim tab performance by channeling the water flow under the tab and holding it there to produce the maximum lift capable of a trim tab
These fins angle 90 degrees down on the sides of the tab
They stop the water flow from escaping and keeping it under the tab for the full length of the tab .
It works like a much larger tab to provide more lift .Because of the variable deadrise panels on the seacraft hull you can't put a wide tab on the back of the transom. The drop fin tabs act like a much wider tab giving more lift in a narrower space.
Wish I could post some pictures,but since photobucket stopped 3rd party hosting unless you pay $400.00 a year I can't. I've been trying other photo sites but haven't found one that makes it easy.
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All this,just for a boat ride
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