Speed has become the commodity convertible buyers most favor. Aware of this, Riviera took no chances in the design of the 58. While the builder's in-house design team is proven, Dutch naval architect Frank Mulder was commissioned to assist in the design of the hull, and tank testing was done in Britain. Mulder specializes in high-speed planing hulls and is best known for his large, high-speed motoryachts. "Whether you're designing a large yacht, a patrol boat or a sportfisher, the basic rules governing planing hulls and speed apply", Mulder said.