Two. If it has three, it would be a "tri-maran".
A catmaran is a leader
A trimaran has 3 hulls.
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There are two different elements to a keel. They are the hydrodynamic element and the structural element. In layman terms, the keel is the backbone. There many different hulls. When you speak of hulls, you have displacement hulls, semi-displacement hulls or planing hulls. Hulls come in different shapes like moulded or hard chined or simply chined.
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Two hulls - catamaran Three hulls - trimaran
A trimaran has 3 hulls, a main hull and two smaller outrigger hulls.
Yes, the plural noun hulls is a common noun, a word for any hull or hulls. The word hulls is also a verb (hull, hulls, hulling, hulled). Example uses: Noun: The hulls are removed before the grain is ground. Verb: This is the machines that hulls the grain.
The plural form of "hull" is "hulls."
Just one...unless it is a catamaran, then it has two to three.