Propeller Basics - Cupping

The design on many propellers includes a cup on the blade's trailing edge. This cupping or curved lip on the blade edge lets the prop grab the water more efficiently.

Getting a better bite on the water reduces ventilation, slipping, and often allows for a better hole shot too.

Cupping works very well where the motor can be trimmed, positioning the propeller near the water's surface.

The curved lip on the propeller helps get a better bite on the water.
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.