– Defense News – The advanced destroyer Zumwalt (DDG 1000) is scheduled to put to sea next week to begin a series of sea trials. It will be the first time the 610-foot-long ship meets the ocean, the culmination of concept and design work that began in the 1990s. The Zumwalt and her two sister ships are built with a tumblehome hull, where the sides slope outward rather than inward or at a straight vertical as in most ship designs. The configuration, part of the ship’s low-cross section or stealth characteristics, is reminiscent of some designs of more than a century ago, but the DDG 1000 takes tumblehome to a new extreme. Essentially, no one has ever been to sea on a full-sized ship of this type.