Mercury - SpitFire 4-Blade Aluminum Propeller 10.6" Diameter x 11" Pitch Right-Hand Rotation Four Blades Aluminum Satin Finish 8M8026620. Overview. You can always tell when your prop is dialed in just right. The boat leaps forward, grips the water like it was born for it, and you feel that steady pull of clean, confident thrust. That's exactly what you get with the Mercury SpitFire 4-Blade Aluminum Propeller. It is designed for small outboards but delivers big-league performance - faster acceler