Boat Engine Propellers

Select a propeller by matching the engine manufacturer’s recommended diameter and pitch for your motor and hull; use the engine’s optimal RPM range at wide-open throttle as a guide—smaller pitch increases acceleration, larger pitch increases top speed, and correct diameter must fit your lower unit clearance

Common materials are aluminum and stainless steel: aluminum is lighter and less expensive with acceptable durability for most recreational use, while stainless steel is stronger, holds shape better under load for improved efficiency and top speed, and resists corrosion longer but costs more

Yes; more blades (three to five) increase grip and reduce cavitation, improving acceleration and load handling at the expense of some top speed and fuel efficiency, while fewer blades generally increase top speed and efficiency but may reduce thrust and smoothness

Very important—ensure the propeller hub type, spline count, and shaft size match your lower unit to ensure proper fit and power transfer; mismatched hubs can cause vibration, slippage, or damage to the prop and drivetrain

Regularly inspect for dings, bends, corrosion, and fishing line wrapped around the hub; repair or replace damaged blades, keep the hub and splines clean and lightly greased, and balance the propeller to minimize vibration and wear

Repair or re-pitch can be cost-effective for minor blade damage or small pitch adjustments, but if the blade metal is fatigued, heavily corroded, or the hub is compromised, replacement is safer and more reliable; compare repair cost against new-prop prices and expected performance

Recreational propellers commonly range from budget options under $50 for basic aluminum to mid-range selections around $50–$150, with higher-end stainless-steel or specialty props costing more; the average price across many listings is roughly in the low hundreds