HIGH-SPEED BOAT WITH SUBMERGED BODY

PURPOSE:To ensure the stability of a hull in sailing at high speeds and improve the sea worthiness, by providing a torpedo type submerged body below the bottom at a front portion of the hull. CONSTITUTION:A torpedo type submerged body 2 is provided below the bottom at a front portion of a hull 1, and an inclined surface 3 is formed at a rear bottom portion of the hull 1 in such a manner as to depend more downwardly as it approaches more to a stern end 1a. The hull 1 is kept under trim by stern in sailing at low speeds, and the submerged body 2 at the front portion of the hull is submerged at a shallow position under the water surface, thereby enabling the boat to sail in a shallower water area. On the other hand, in sailing at high speeds, the inclined surface 3 receives a fluid force to keep the hull under trim by stem. As a result, the submerged body 2 is submerged sufficiently deeply under the water surface, thereby reliably obtaining a hull motion reducing effect.