Mercury – Black Max 3-Blade Extra Cup Aluminum Propeller | 16" Diameter x 11" Pitch | Right-Hand Rotation | 3-Blade | Aluminum | Phantom Black Finish |78112CP1 Overview There’s a reason so many boaters swear by the Mercury Black Max propeller —it’s dependable, smooth, and feels like a natural extension of your boat. The Mercury Black Max 3-Blade Extra Cup Aluminum Propeller (Part Number 78112CP1) takes that same trusted performance and adds a twist—literally. With an extra cup at the blade tips, it grips the water tighter, holds plane longer, and gives pontoon and heavy-load boats that extra bit of thrust when it matters most. Every throttle push feels deliberate, confident, and connected. Key Features Diameter & Pitch: 16" diameter x 11" pitch Rotation: Right-Hand Blade Count: 3-Blade design for smooth power and balanced lift Material: Patented Mercalloy aluminum alloy for strength and flexibility under stress Finish: Mercury Phantom Black glossy enamel for long-lasting corrosion resistance Hub System: Includes Flo-Torq II Hub Kit 835257K1 for drivetrain protection and shock absorption Design Details: Extra Cup blade geometry provides stronger grip and lift—especially beneficial for pontoons and loaded boats Engine & Boat Compatibility Designed for Mercury and Mariner 90–115 HP FourStroke Command Thrust outboards Compatible with Mercury and Mariner 135–300 HP TwoStroke and FourStroke outboards Fits MerCruiser Alpha One and Bravo One sterndrives Excellent choice for pontoons, fishing boats, and runabouts that need added lift, steady handling, and dependable midrange power Performance Benefits The Black Max 78112CP1 isn’t just about speed—it’s about control and confidence. The extra cup blade design gives you a stronger hold on the water, reducing slip and providing a smoother ride even when your boat’s heavily loaded or cruising in rougher conditions. When you accelerate, it grabs the water firmly, lifting your boat onto plane with steady, predictable power. You’ll feel the prop’s precision in tight turns and while maintaining slower cruising speeds. Th e added cup helps keep your boat planted, preventing ventilation and improving fuel efficiency. Crafted from Mercury’s Mercalloy aluminum , it’s durable enough to take a beating but flexible enough to absorb minor impacts without cracking. The Phantom Black enamel finish adds protection from corrosion, ensuring it looks sharp and performs smoothly season after season. Co mbined with the Flo-Torq II Hub Kit , it reduces vibration and protects your drivetrain from sudden shocks—so every ride feels solid and controlled. Why is this prop a strong choice vs. alternatives? Mercury OEM quality: Designed and tested by Mercury engineers, ensuring perfect compatibility, balanced performance, and factory-grade reliability. Reliable and easy to maintain: Built from durable Mercalloy aluminum that resists corrosion and handles light impacts, keeping you on the water longer with less upkeep. Cost-effective vs. stainless: Delivers smooth, confident performance at a fraction of the price of stainless-steel propellers, offering true value without compromise. Versatile fit across multiple setups: Ideal for pontoons, fishing boats, and cruisers alike, fitting a wide range of Mercury and Mariner outboards and sterndrives. FAQ Section Q1: Which Mercury engines does the Black Max 78112CP1 fit? It fits Mercury and Mariner 90–115 HP FourStroke Command Thrust outboards, 135–300 HP TwoStroke and FourStroke outboards, and MerCruiser Alpha One and Bravo One sterndrives. Q2: What makes this propeller different from other Mercury options? This version includes Extra Cup (XC) blade geometry , which increases lift, improves grip, and enhances performance for pontoons and heavier boats. It’s built from Mercury’s Mercalloy aluminum for the ideal balance of toughness and flexibility. Q3: How do I know if this pitch or size is right for my boat? The 11-pitch design is ideal for heavier boats or those needing stronger low-end thrust and planing power. Compare with your current prop or consult your engine’s manual to confirm. Q4: Can this prop be used in both saltwater and freshwater? Yes. The Phantom Black enamel finish is corrosion-resistant, ensuring long-term protection in all water conditions. Q5: What hub system does it use? It includes the Flo-Torq II Hub Kit 835257K1 , which absorbs shock, reduces vibration, and protects your prop shaft from impact damage.
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