Catamarans can be harder to tack (turn through the wind). Because they are lighter in proportion to their sail size, they have less momentum to carry them through the turn when they are head to wind. Correct use of the jib sail is often essential in successfully completing a tack without ending up stuck in irons (pointing dead into the wind and sailing backwards).
They have a higher average speed.
Catamarans are less likely to capsize in the classic ‘beam-wise’ manner but often have a tendency to ‘pole-axe’ (or ‘pitchpole’) instead – where the leeward (downwind) bow sinks into the water and the boat ‘trips’ over forward, leading to a capsize.
Teaching for new sailors is usually carried out in monohulls as they are thought easier to learn to sail, a mixture of all the differences mentioned probably contributes to this.
Catamarans, and multihulls in general, are normally faster than single-hull boats for four reasons:
each hull of a catamaran is (typically) thinner in cross section than those of monohulls;
catamarans are lighter due to the fact there is no keel counterweight.
catamarans have a wider beam (the distance from one side of the boat to the other), which makes them more stable and therefore able to carry more sail area per unit of length than an equivalent monohull.
the greater stability means that the sail is more likely to stay upright in a gust, drawing more power than a monohull’s sail which is more likely to heel (lean) over.
A catamaran is most likely to achieve its maximum speed when its forward motion is not unduly disturbed by wave action. This is achieved in waters where the wavelength of the waves is somewhat greater than the waterline length of the hulls, or it is achieved by the design piercing the waves. In either case pitching (rocking horse-like motion) is reduced. This has led to it being said that catamarans are especially favourable in coastal waters, where the often sheltered waters permit the boat to reach and maintain its maximum speed.
Catamarans make good cruising and long distance boats: The Race (around the world, in 2001) was won by the giant catamaran Club Med skippered by Grant Dalton. It went round the earth in 62 days at an average speed of eighteen knots.
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