Mercury - Black Max 3-Blade Extra Cup Aluminum Propeller 16" Diameter x 11" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 78112CP1. Overview. There's a reason so many boaters swear by the Mercury Black Max propeller-it's dependable, smooth, and feels like a natural extension of your boat. The Mercury Black Max 3-Blade Extra Cup Aluminum Propeller (Part Number 78112CP1) takes that same trusted performance and adds a twist-literally. With an extra cup at the blade tips, it grips