Mercury - Black Max 3-Blade Extra Cup Aluminum Propeller 15.5" Diameter x 15" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish 78116CP1. Overview. There's a certain peace that comes from knowing your boat will respond exactly the way you expect it to. The Mercury Black Max 3-Blade Extra Cup Aluminum Propeller (Part Number 78116CP1) gives you that confidence every time you leave the dock. It's smooth, steady, and built for real-world boating-those early morning fishing runs, slow d