Multihull ships (vessels, craft, boats) comprise a great variety of types, sizes and applications. A very specific sub-group of multihulls is the Small Waterplane Area (SWA) multihulls. A twin-hull version of this subgroup is commonly known as SWATH (Small-waterplane-area twin hull). At the present time, the main interests in shipbuilding and shipping industries of multihull vessels are focused on engine-powered ships.