Flushlap

Flushlap, also known as flushed lap or smooth lap, is a design element in flat sailboat hull design where the vertical angle between the hull and the deck is minimized at the point of contact. This results in a smooth, continuous curve connecting the two surfaces. The aim of flushlap is to reduce resistance caused by sharp corners and edges by integrating the hull and deck collectively.

Characteristics of flushlap designs include a streamlined appearance, with the edge of the deck concealed by the hull's curve and absence of overlapping edges or gaps. Flushlap construction may be achieved through integrating frame members, molded materials, or custom builds. Builders often specify flushlap designs in traditional or racy boats, but it can be seen in types from simple to moderately complex designs. It serves several purposes, including both structural and aesthetic advantages.

Differences between flushlap and deck-to-hull designs include reduced wetted surface area when water meets the hull and deck at a same lower corner, versus slight gaps and moist spots that marks other sailboats designs. Overall flushlap results in improved boat stability and aerodynamics but steeper operating costs due to increased design complexity and length demands. Variations may be preferred for certain purposes and settings. Despite complexities, flushlap is generally considered beneficial for sailboats and traditional wooden ships working on water sources. It may be determined that strong accomplishments of known {referen specificity}.