Mercury – Black Max 3-Blade Extra Cup Aluminum Propeller | 15.5" Diameter x 15" Pitch | Right-Hand Rotation | 3-Blade | Aluminum | Phantom Black Finish | 78116CP1

Overview

There’s a certain peace that comes from knowing your boat will respond exactly the way you expect it to. The Mercury Black Max 3-Blade Extra Cup Aluminum Propeller (Part Number 78116CP1) gives you that confidence every time you leave the dock. It’s smooth, steady, and built for real-world boating—those early morning fishing runs, slow drifts past the reeds, and easy afternoon cruises with friends. The Extra Cup design grips the water a little tighter, giving you more lift and control when you need it most. For anyone who loves the feel of a well-balanced prop under the throttle, this one just feels right.

Key Features

• Diameter & Pitch: 15.5" diameter x 15" pitch for balanced lift and reliable acceleration
• Rotation: Right-Hand rotation for standard outboard and sterndrive applications
• Blade Count: 3-Blade configuration for smooth cruising and strong, consistent thrust
• Material: Mercury’s patented Mercalloy aluminum alloy—durable yet forgiving when hitting light debris
• Finish: Glossy Phantom Black enamel for long-term corrosion resistance
• Hub System: Includes Flo-Torq II Hub Kit 835257K1 to absorb shock and protect drivetrain components
• Design Details: Extra Cup (XC) blade geometry enhances grip and performance—especially on pontoon boats and heavier hulls

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
• Works with MerCruiser Alpha One and Bravo One sterndrives
• Ideal for pontoons, fishing boats, bowriders, runabouts, and small cruisers

Performance Benefits

The Mercury Black Max 78116CP1 is the propeller that quietly delivers day after day, trip after trip. From a standstill, you’ll notice how quickly it bites and gets your boat on plane—no hesitation, just smooth acceleration. Once you’re moving, the Extra Cup design keeps your prop gripped to the water, providing lift and stability even in light chop.

Its Mercalloy aluminum construction gives you the best of both worlds—strength that stands up to long-term use and enough flexibility to absorb light impacts without cracking. That means less worry when you’re cruising in shallow water or unfamiliar spots. The result is a propeller that runs smooth, handles confidently, and keeps your ride quiet and composed.

It’s a prop made for boaters who know that reliability isn’t about flash—it’s about consistency. You can feel the Mercury engineering at work every time you throttle up.

Why is this prop a strong choice vs. alternatives?

• Mercury OEM quality: Designed and manufactured by Mercury’s own engineers for precise fit and factory-level performance.
• Reliable and easy to maintain: Straightforward installation and minimal upkeep make it a dependable choice for all types of boaters.
• Cost-effective vs. stainless: Offers impressive performance and resilience without the high price or stiffness of stainless steel props.
• Versatile fit across multiple setups: Works seamlessly across many Mercury and Mariner engines, making it a go-to prop for boaters who own or operate multiple setups.

FAQ Section

Q1: Which Mercury engines does the Black Max 78116CP1 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?

The Extra Cup blade geometry gives it better lift and grip, making it ideal for pontoon boats and heavier hulls. Its Mercalloy aluminum alloy provides a unique combination of strength and flexibility for real-world boating conditions.

Q3: How do I know if this pitch or size is right for my boat?

The 15-pitch setup provides excellent all-around performance—quick to plane, steady at speed, and efficient at cruising RPMs. Check your existing prop size or owner’s manual to confirm the best match.

Q4: Can this prop be used in both saltwater and freshwater?

Yes. The Phantom Black enamel finish provides outstanding protection against corrosion in both saltwater and freshwater environments.

Q5: What hub system does it use?

It includes the Flo-Torq II Hub Kit 835257K1, which cushions drivetrain components from sudden impact, reduces vibration, and helps deliver a quieter, smoother ride.