Propeller Basics - Ventilation

Ventilation

Ventilation is a situation where surface air or exhaust gasses are drawn into the propeller blades.

When this situation occurs, boat speed is lost and engine RPM climbs rapidly.

This can result from excessively tight cornering, a motor that is mounted very 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
Left-Handed Props
Performance Exhaust
Aluminum vs. Stainless Steel

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.