Quote: (05-19-2016 06:50 PM)Aquiles_Baesta_Parada Wrote:
Quote: (05-19-2016 06:43 PM)Disco_Volante Wrote:
He permanently planted the fantasy in my head of partying on a catamaran with bikini-clad 19 yr olds. I didn't even really know what a catamaran was before NTP.
Wtf is a catamaran?
https://en.wikipedia.org/wiki/Catamaran
Quote:Quote:
A catamaran (/ˌkætəməˈræn/) (informally, a "cat") is a multi-hulled watercraft featuring two parallel hulls of equal size. It is a geometry-stabilized craft, deriving its stability from its wide beam, rather than from a ballasted keel as with a monohull sailboat. Being ballast-free and therefore lighter than a monohull, catamarans often have a shallower draft (draught) than comparably-sized monohulls. The two hulls combined also often have a smaller hydrodynamic resistance than comparable monohulls, requiring less propulsive power from either sails or motors. The catamaran's wider stance on the water can reduce both heeling and wave-induced motion, as compared with a monohull.
Catamarans range in size from small (sailing or rowing vessels) to large (naval ships and car ferries). The structure connecting a catamaran's two hulls ranges from a simple frame strung with webbing to support the crew to a bridging superstructure incorporating extensive cabin and/or cargo space.
Chosen mostly for their performance characteristics:
Quote:Quote:
Catamarans have two distinct primary performance characteristics that distinguish them from displacement monohull vessels: lower resistance to passage through the water and greater stability (initial resistance to capsize). Choosing between a monohull and catamaran configuration includes considerations of carrying capacity, speed, and efficiency.
Resistance[edit]
At low to moderate speeds, a lightweight catamaran hull experiences resistance to passage through water that is approximately proportional to the square of its speed. A displacement monohull, by comparison experiences resistance that is at least the third power of its speed. This means that a catamaran would require four times the power in order to double its speed, whereas a monohull would require eight times the power to double its speed, starting at a slow speed.[17] For powered catamarans, this implies smaller power plants (although two are typically required). For sailing catamarans, low forward resistance[18] allows the sails to derive power from attached flow,[19] their most efficient mode—analogous to a wing—leading to the use of wingsails in racing craft.[20]
Stability[edit]
Catamarans rely primarily on form stability to resist heeling and capsize.[17] Comparison of heeling stability of a rectangular-cross section monohull of beam, B, compared with two catamaran hulls of width B/2, separated by a distance, 2×B, determines that the catamaran has an initial resistance to heeling that is seven times that of the monhull.[21] Compared with a monohull, a cruising catamaran sailboat has a high initial resistance to heeling and capsize.—a fifty-footer requires four times the force to initiate a capsize than an equivalent monohull.
They can also be quite simple:
![[Image: Bladef16-1up.jpg]](https://upload.wikimedia.org/wikipedia/commons/d/d1/Bladef16-1up.jpg)
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