YOUNG PROPS 14.5x17 4-Blade Aluminum Propeller for Mercruiser Alpha/Bravo One — 15-Tooth Flo-Torq II Hub, Right-Hand

The YOUNG PROPS 14 1/2 x 17 4-blade propeller is a direct-fit aluminum replacement for Mercruiser Alpha and Bravo One sterndrive and compatible outboard setups, designed to restore acceleration and cruising performance.

This four-blade propeller combines a 14.5-inch diameter with a 17-inch pitch and a 15-tooth hub to match many Mercury/Mercruiser 135–300 HP sterndrive and compatible outboard systems. Built from alloy-aluminum and supplied with a Flo-Torq II style hub kit (part 835257Q1), it’s intended as a reliable spare or replacement to help maintain speed, throttle response and drivability without requiring aftermarket modifications.

Will this prop fit my Mercruiser Alpha or Bravo One drive?

If your boat uses a 4.75" gearcase and a right-hand rotation propeller, this unit is engineered to fit directly as an OEM-style replacement for many Mercury/Mercruiser sterndrive and compatible outboard applications in the 135–300 HP range. Confirm gearcase size, spline/tooth count and rotation before purchase.

• Diameter: 14.5 inches and pitch: 17 inches for the intended performance band.
• Hub tooth count: 15, matching many Mercruiser Flo-Torq II hubs.
• Rotation: right-hand (clockwise when viewed from stern).
• Gearcase compatibility: fits 4.75" lower unit gearcases common to Alpha/Bravo One drives.

How does a 4-blade design affect speed and handling?

A four-blade configuration increases bite in the water, improving acceleration and reducing ventilation in heavy loads or rough water compared with three-blade alternatives. Expect stronger mid-range thrust and steadier planing, with a modest trade-off in top-end rpm versus a three-blade propeller of similar pitch.

• Better low- and mid-range acceleration for quick plane and load carrying.
• Improved hole-shot and reduced slippage with heavier boats or gear.
• Smoother pull in choppy conditions and when towing.
• Slightly lower theoretical top speed than a lighter three-blade of same pitch.

What comes in the box and how easy is installation?

YOUNG PROPS ships this propeller with a Flo-Torq II compatible hub kit (835257Q1) and the necessary hardware to mount it, including thrust washer, drive sleeve, aft adaptor, tab washer and prop nut. Installation is straightforward for anyone familiar with sterndrive prop changes; basic tools and attention to torque and tabbing instructions are required.

• Included hub kit: 835257Q1 Flo-Torq II components for simple installation.
• Hardware provided: forward thrust washer, drive sleeve, aft adaptor, tab washer, prop nut.
• Installation notes: check spline engagement, torque spec, and tab washer seating.
• Recommended: a quick sea trial after installation to verify shaft alignment and rpm targets.

How durable is this alloy-aluminum propeller and what warranty is offered?

The propeller is manufactured under controlled quality processes intended to balance strength and light weight for efficient performance. YOUNG PROPS provides a 12-month replacement warranty covering blade fracture and hub slippage under normal use (excludes wear, impact damage, improper fitting or modification).

• Material: alloy-aluminum for corrosion resistance and reduced weight.
• Quality control: manufactured to consistent standards to protect engine loading.
• Warranty: 12 months for blade fracture and hub slipping (limited conditions).
• Exclusions: normal wear, accidental damage, or incorrect installation.

Who is this for: This YOUNG PROPS 14.5x17 4-blade propeller suits boat owners with Mercruiser Alpha or Bravo One sterndrives (and compatible outboards) who need a cost-effective, OEM-style replacement to restore acceleration, towing performance or everyday reliability. It’s a good choice for anglers, family runabouts and boaters who prioritize mid-range thrust and improved handling under load.