The American Power Boat Association  sanctions a race in which category, which has a hull shape that allows the boat to be supported by planing forces?
American Power Boat Association:  The APBA sanctions races in a number of different categories including the Unlimited Hydroplanes, Inboard, Outboard Performance Craft, Stock Outboard, Modified Outboard, Pro Outboard, Outboard Drag, Offshore and Special Events classes. Hydroplane (boat): A hydroplane (or hydro, or "thunderboat") is a fast motorboat, where the hull shape is such that at speed, the weight of the boat is supported by planing forces, rather than simple buoyancy.
hydroplane