During the 2019 Miami International Boat Show, Mercury Racing announced that it is expanding its MAX5 propeller family by adding 15.25-inch-diameter offerings of the base model and the all-new MAX5 ST.
The MAX5 propeller—developed and handcrafted by Mercury Racing Propeller artisans—is designed for single and multiple-engine applications, including the 400R outboard and 600 SCi sterndrive. The lab-finished MAX5 provides a measurable reduction in propeller slip (up to 12 percent). In fact, the MAX5 prop is so efficient builders are finding they can run it higher to take full advantage of engines fitted with the race-proven Sport Master gearcase.
Bigger is Better: New 15.25-inch-diameter models offer 3-4 percent reduction in slip compared to the 15.00-inch models on select outboard and sterndrive applications that benefit from elevated transom heights. Half-inch pitch offerings enable engines to be dialed-in to their maximum rpm operating range for enhanced throttle response, optimized cruise fuel efficiency and optimal top speed.
MAX5 ST: The new Mercury Racing MAX5 ST propeller is designed for the 4.6L V8 300R FourStroke outboard with Sport Master gearcase. The shortened exhaust barrel enhances the performance of single-engine bass boats and twin-engine catamarans by keeping the stern planted for a confidence-inspired ride, while the large 15.25-inch-diameter prop stays hooked up at extreme engine heights.
Initial test results are promising. A 300R FourStroke spinning a 31-inch pitch MAX5 ST prop powered a tournament-loaded Bullet 21 XRS bass boat to 97.5 mph with a mere 7 percent slip. All MAX5 propellers feature the Mercury-patented Performance Vent System (PVS), which enables the user to fine-tune the amount of venting needed for quick planing. Visit MercuryRacing.com/propellers to view the Artisans—a video on the hand craftsmanship that goes into every Mercury Racing propeller.