Many of today’s propellers incorporate a cup at the trailing edge of the propeller blade. This curved lip on the propeller allows it to get a better bite on the water. This results in reduced ventilation, slipping, and allows for a better hole shot in many cases. A cupped propeller also works well where the motor can be trimmed so that the propeller is near the surface of the water. The cup will typically result in higher top speed on one of these applications.