Mercury - SpitFire Propeller 14" Diameter x 12" Pitch Right-Hand Rotation 4-Blade Aluminum Polished Finish 8M0084491. Overview. When you drop the throttle with the Mercury SpitFire prop, you will feel the kind of response that makes you grin before the boat even levels out. It's that quick, confident lift - the kind that turns hesitation into instant movement. The bow rises, settles, and you're slicing cleanly across the water with steady control. This prop doesn't just move your boat; it transf