Effects
The twin-hull design provides a stable platform and large, broad decks. The main disadvantages of SWATH watercraft are that they are more expensive than conventional catamarans or mono-hulls, require a complex control system, have a deeper draft, and have higher maintenance requirements. The design of SWATH vessels is also considerably more complex due to the structural complexities inherent to the design. Additionally, SWATH vessels cannot operate in planing or semi-planing modes and as such gain no drag reduction when operating at speeds normally associated with such modes. This marginally limits SWATH speed when compared to equivalent catamaran vessels.
Read more about this topic: Small-waterplane-area Twin Hull
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—Lewis Mumford (1895–1990)