Propeller Basics - Ventilation

Ventilation occurs when surface air or exhaust gasses are pulled into the boat propeller blades.

When this happens the engine RPMs increase rapidly and the boat loses speed.

Ventilation can be caused by tight cornering, a motor mounted too high on the transom, or by over-trimming the engine.

Propeller Help Guide
P is for Propeller Propeller Basics
How To Choose A Prop
Diameter Pitch
Cupping Rake
Ventilation Cavitation

We tell you everything you need to know about props from cupping to ventilation.

Learn About Prop Characteristics Prop Characteristics
3 Blades VS. 4 Splines
Aluminum vs. Stainless Steel
Performance Exhaust
Left-Handed Props FAQ

If you want to modify your boat's performance, consider the above before making your selection.

Learn About Engine RPM Determining RPM's
Effect of pitch on RPM
Test for Maximum RPM

For safety and efficient performance, it is critical that your engine operates within the RPM range recommended by the manufacturer.