This report describes the evaluation by means of model tests of an unusual hull from intended for high-speed operation in rough seas. The from can be described as a surfaced submarine, made longer and more slender in order to attain high calm-water speed. A long natural pitching peak ballast tanks for rough water operation. It was considered best not to attempt to keep water off the deck, and therefore comparatively low freeboard and tumblehome were adopted.nIt is concluded that a semi-submerged ship of the type tested shows promise of attaining much higher rough-water speeds than conventional destroyers, provided sufficient power can be installed.nIt is recommended that further research be directed toward providing a superstructure design that will reduce wave impact effects and a hull form which will require less power at high speed in rough water.
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