What characteristic distinguishes a planing hull?

A planing hull is specifically designed to rise above the water's surface at higher speeds, allowing the boat to glide on top of the water rather than pushing it aside. This characteristic is what enables planing hulls to achieve higher speeds efficiently due to reduced water resistance. When these hulls reach a certain speed, they generate lift which allows them to transition from a standard displacement mode, where they displace water, to a planing mode where they skim across the surface. This capability makes planing hulls ideal for activities like watersports and recreational boating, where speed and agility are paramount.

In contrast, other hull types, such as displacement hulls, are designed to travel slower by moving through the water by displacing it, which is reflected in the other choices. The depth of draft is also less relevant for identifying planing hulls, as they are typically shallower than displacement hulls. Thus, the defining feature of a planing hull is its ability to rise and glide on top of the water at high speeds.