Mercury - Enertia 3-Blade Stainless Steel Propeller 15.3" Diameter x 14" Pitch Left-Hand Rotation 3-Blade X7 Stainless Steel Polished Finish 8M0151228. Overview. There's a feeling you get when your boat lifts cleanly onto plane - smooth, steady, and full of power. The Mercury Enertia 3-Blade Stainless Steel Propeller (Part Number 8M0151228) was built for that exact moment. It's sharp, quick to respond, and feels almost intuitive, like it knows what you want before you do. Designed for those who