Abstract: In order to prevent the occurrence of corrosion due to the sliding of a relatively wide aluminum conductive layer (12) such as a power source conductive layer or a ground conductive layer, formed on a semiconductor substrate (11), breakage of a lower conductive layer due to the sliding of an upper aluminum conductive layer (12) in case of a multilayer interconnection, and the creation of voids in the lower aluminum conductive layer due to the moisture beneath the relatively wide metal conductive layer in case of a multi layer interconnection etc., the conductive layer structure is constructed so that the conductive layer (12) relatively great in width is divided into several conductive layer portions and so that the width of each of the divided conductive layer portions is in a range of 10 .mu.m to 40 .mu.m.

Abstract: Two embodiments of hull designs for catamarans in which the sponsons are configured so as to provide a displacement type operation and in which the sponsons are configured so as to improve stability while reducing flow resistance. The sponsons are generally curved along their bottom surfaces and have a width that begins at a knife edge, increases gradually toward midships, then decreases with an increasing width section at the rear end thereof. In one embodiment, the sponsons are asymmetric so as to reduce the generation of waves deflected inwardly toward the main hull. In another embodiment they are symmetric. The main hull is also provided with a step at its rear end so as to avoid wave interference and the sponsons have steps at their rear ends so as to reduce front end lift when travelling at high speeds and reduce flow resistance.

Abstract: A catamaran construction formed from a molded fiberglass reinforced resin and a method for making it wherein the hull is comprised of a main hull and a pair of sponsons each affixed to the respective sides of the main hull. The main hull is formed from upper and lower portions, each of which contains the respective portion of the main hull and the sponsons, all integrally connected to each other.

Abstract: A stabilizing device for a hydrofoil type watercraft embodying a fully submerged hydrofoil. A flywheel is supported for precessive effect and is operatively connected to the steering shaft for effecting movement of the steering shaft and associated hydrofoil for generating a stability force on the hull in response to leaning thereof.

Abstract: A structure for holding an underwater projection projecting downward from the bottom of hull of a hydrofoil craft or the like. The projection is connected at its rear end base portion to the hull by a hinge pivotally movably rearward and held at its front end base portion in a predetermined downwardly projecting state by a breakable holder. The projection is held in this state during usual navigation. The holder breaks when a predetermined force acts rearward on the projection, permitting the projection to move about the hinge, whereby the projection is prevented from damage.