Stefano Huang

An outboard propeller works in one of the harshest environments on a boat. Every trip exposes it to sand, rocks, floating debris, shallow water, and continuous high-speed rotation. The challenge is that propeller damage often develops slowly. A tiny chip today may become a crack tomorrow, while slight vibration can eventually damage bearings, sigilli, or even the lower unit. Learning how to recognize the early warning signs helps boat owners avoid expensive repairs, improve fuel economy, and maintain safe performance on the water. In questa guida, you’ll learn the most common signs of outboard propeller damage, how to inspect your ...

When a boat suddenly loses thrust, engine RPM rises without matching acceleration, or the propeller shows unusual surface damage, many operators assume the propeller is simply worn out. In realtà, the problem may be propeller cavitation. Cavitation is one of the most misunderstood issues affecting outboard motor performance. It reduces efficiency, increases fuel consumption, shortens propeller life, and may even lead to expensive repairs if ignored. Although it is often confused with ventilation, the two problems have different causes and require different solutions. In questa guida, we’ll explain what cavitation is, what causes it, how it affects your boat, E ...

When the boating season ends, many owners focus on winterizing the engine but overlook one of the most important components below the waterline—the outboard motor propeller. Proper seasonal maintenance not only protects the propeller itself but also helps prevent hidden damage to the propeller shaft, gearbox, and seals. Whether you use an aluminum or stainless steel propeller, spending a short amount of time on inspection and maintenance before storage can reduce unexpected failures, improve performance next season, and extend the service life of your outboard motor. This guide explains exactly what to inspect, pulito, repair, and prepare before storing your ...

Most outboard propellers include important information such as diameter, pece, rotation direction, hub type, and manufacturer codes. While different brands may use slightly different marking formats, the basic sizing system is very similar across the industry. In questa guida, you’ll learn what each number means, how to identify the correct propeller for your boat, and when changing propeller size makes sense. Where Can You Find the Size Marks on an Outboard Propeller? Propeller size markings, indicating diameter and pitch, are typically stamped directly onto the outer hub, blade roots, or the rear face near the mounting nut. Common Locations on ...