Mercury - SpitFire 4-Blade Aluminum Propeller 10.3" Diameter x 13" Pitch Right-Hand Rotation Four Blades Aluminum Satin Finish 8M8026630. Overview. There's a real difference between a prop that simply moves your boat and one that brings it to life. The Mercury SpitFire 4-Blade Aluminum Propeller falls squarely in the latter category. Designed for smaller outboards but built with the spirit of performance, it delivers crisp acceleration, solid grip, and the kind of control that makes every outing