By the 1930s, the principle of the planing hull was well established. Engines were light and strong. Boats designed during this decade tended to be narrower than later designs.
The Chris Craft Racing Runabout was designed in the mid 30s and continued until the early 50s. It was light and fast. Later models were varnished.
Chris-Craft Customs, commonly called barrelbacks were designed in the late thirties. Heavily influenced by the streamlining trend of the time, their upper transoms described a semicircle.