Mercury - Thunderbolt Propeller High-Performance Series High-Polished Stainless Steel QS5006X. Overview. Every boater knows that feeling when the hull rises cleanly onto plane and the boat responds exactly the way you expect. It's a mix of trust and relief-like your rig is saying, "I've got you." The Thunderbolt propeller delivers that kind of confidence every time you throttle up. Whether you're running offshore before sunrise or easing into a quiet creek at sunset, it's reassuring to rely on a