Mercury - SpitFire 4-Blade Aluminum Propeller 14" Diameter x 17" Pitch Right-Hand Rotation 4 Blades Aluminum Polished Finish 8M0084494. Overview. Some props just feel different the moment the throttle goes down -smoother, quicker, and more connected. That's exactly the experience you get with the Mercury SpitFire 4-Blade Aluminum Propeller (Part Number 8M0084494). Built for boaters who demand more than average, it offers the lift and grip of a four-blade without sacrificing the top-end speed tha