By adding a thrid hull to make it a trimaran. The outer two hulls are slightly raised acting as stablisers. This enables you to have a slimmer than normal hull for the middle thus creating less drag in a straight line.
A trimaran
Trimaran
Double hulled ships, outriggers Double hulled ships, outriggers
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A catamaran - is a twin-hulled sailing boat.
A catamaran, a twin hulled speedster.
Catamarans.
Technically, the first steel hulled ship was the French warship 'Redoubtable ' in 1876. However, iron hulled ships had been used 30 years before this.
The lightning is conducted through the metal to discharge into the water. Metal-hulled boats, airplanes, and buildings are frequently hit by lightning with no harm to the occupants.
A multi-hulled yacht or boat is also known as a catamaran. The official Definition is: A multi-hulled boat has at least three hulls, with the outside hulls extending forward beyond the central or inside hull or hulls.The hulls are tapered with a cross-sectional configuration that increases in side front to rear, thus forming a channel or tunnel between adjacent hulls which decreases in cross-sectional size front to rear. Air entering the tunnels is compressed, thus imparting a lifting force to the hulls lifting the hulls partially out of the water to decrease the hydraulic drag on the hulls.Multi-hulled boats are often offered for charter vacations around the world. An example of a multi-hulled boat is the Aldebaran located in the Caribbean: www.bookaldebaran.com
Robert Fulton