JPS6418794A - Double-layer type boat construction - Google Patents

Abstract

PURPOSE:To increase both the capacity of a boat and the attitude recovery against waves by forming a relatively narrower lower layer section under the upper layer section formed above the standard boat bottom, the lower layer section successively extending in the direction of the length of the upper layer section, and mounting a propelling engine inside the lower layer section. CONSTITUTION:A boat has both the upper layer section 1 above the standard bottom line 2 and the lower layer section 2 projecting downward from the center part of the upper section. The lower layer section 2 has relatively narrower width in comparison with that of the upper layer section 1 and extends successively in the direction of the length of the upper layer section 1 of the boat. The double-layer bottom part of the boat 1 consists of the upper layer section 1 and the lower layer section 3 divided by the standard bottom line 2. At least a propelling engine is mounted inside said lower layer section 3 so that the inner space of the boat may be increased and the shipping capacity of cargo and the passengers occupancy also increased. Furthermore, the center of gravity may be lowered sufficiently with respect to the center of buoyancy may be lowered and the boat has the sufficient attitude recovery so that the boat can take sufficient countermeasure against dangers in the natural condition and maintain safe cruising.