What Is the Fin on the Bottom of a Boat Motor Called?
If you have ever looked at an outboard motor, whether it is a powerful Honda boat motor or one of the reliable Tohatsu outboard motors for sale , you have likely noticed a flat, wing-like projection at the very bottom, just above the propeller. This unassuming component plays a critical role in the performance and handling of your boat. But what exactly is it called? The fin on the bottom of a boat motor is most commonly known as the anti-ventilation plate . While some people might informally refer to it as a "cavitation plate" or simply a "skeg plate" (though the skeg is a different, distinct part), its primary function gives it its proper name. Understanding its purpose is key to appreciating its design and placement. Understanding the Anti-Ventilation Plate The term "ventilation" in boating refers to a phenomenon where air from the surface, or exhaust gases from the motor, gets drawn into the propeller. When this happens, the propeller loses its grip...