Abstract: A new method of hull construction using double, longitudinal, sealed, alternate and prestressed wooden planking. The hull is formed of an inner layer of longitudinally extending planks and an outer layer of longitudinally extending planks alternately positioned over and glued to the inner layer. Both layers are attached to the ribs defining the hull framework. The inner layer planks are abutted and glued along their longitudinal edges. The outer layer planks are beveled along their longitudinal edges forming longitudinal grooves between each plank. Hardwood splines, running the length of the longitudinal grooves are glued and forced into the grooves.