The key to the good performance of the vertical SeaCraft scuppers is a wedge thats about 1/4" tall right in front of the scupper outlet, shown in picture below. It creates a significant amount of suction that really pulls the water out when you're up on plane. I suspect the aeration created by the adjacent vertical step between the center and outer panel of the variable deadrise hull also helps.
Second shot shows the aeration that reduces drag and makes these hulls so soft riding!
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