When you're ready to come about on a multihull, do it decisively, and make sure you are close to the wind yet still maintaining good speed. Trim the mainsheet in hard before tacking. This will allow the mainsail to act like the aft section of a windvane, helping swing the boat into the wind. Find a lull in the waves and bring the helm over smoothly, and keep it there until you approach 45 degrees off the wind on the new tack. At that point slowly reverse the helm to bring the boat onto your new heading.
Itís really that simple, but youíd be surprised at the number of novice multihull sailors who get themselves into trouble tacking. As you pass through the wind, ease the mainsheet a bit to reduce the windvane effect, which is no longer needed, and to allow the mainsail to fill and provide power on the new tack. If you lose momentum during the tack and need to backwind the jib, delay the release of the headsail sheet until the back side of the jib has filled and is pushing the boat off the wind on the new tack. As soon as you're well through the wind, but no further than necessary, release the windward sheet and haul the leeward sheet in quickly to get the boat moving forward again. Always trim the jib first and then the main. And by all means allow the boat to pick up speed before trying to sail close-winded again.
When sailing to windward, you'll have to allow for additional leeway in any shallow-draft boat. Daggerboards help reduce leeway by offering resistance under the water. Use the recommendations of your boat's builder or designer along with your own experience under sail to determine how much daggerboard to deploy in various sea conditions. On catamarans that have a daggerboard in each hull or trimarans with a board in each ama, use both boards in light winds to give you the most lift. In moderate winds, use only the leeward board since it will be in slightly deeper water as the boat heels. As you gain speed or fall off the wind, the daggerboard can be raised gradually. High speeds can make it difficult to raise the board, so you may find that you have to reduce speed temporarily to ease the pressure on the board.
If your boat has daggerboards, raise the boards gradually as you head off the wind. When running, have the boards almost all the way up, immersed just enough to improve steerage. You will probably want to use some more daggerboard in stronger winds to help unload the pressure on the rudders. With so little heel, the typical rolling motion of a monohull is all but eliminated on a multihull, and the tendency to broach is greatly reduced. And thatís good news because less roll means less chance of accidentally jibing.
Even if you do jibe suddenly, intentionally or not, it will undoubtedly seem like a routine maneuver, since chances are the boom will be well above head height. The boom and mainsail foot on most multihulls are of modest proportions, and with the boat traveling at a good rate of speed, all you have to do is avoid the mainsheet and the traveler as they come across the boat and youíll be safe and sound.
|"With so little heel, the typical rolling motion of a monohull is all but eliminated on a multihull, and the tendency to broach is greatly reduced. "|
To jibe intentionally, begin turning the boat downwind as the mainsail (both the sheet and the traveler) is trimmed to bring the boom on centerline. As the boat turns and the mainsail passes through the wind and begins to fill on the other side, ease the mainsheet and set for a broad reach. Make sure to maintain boat speed to keep the apparent wind light. Release the windward jib sheet and trim the leeward jib sheet.
Many multihull cruisers like to dowse the mainsail and fly twin headsails downwind, with one sail poled out on a permanently mounted whisker pole. Twin headsails can be rigged using twin forestays, twin grooves in a roller-furling track, or a two-ply headsail. Use a working jib and genoa in stronger winds, then a genoa and drifter in lighter winds until it's time for a spinnaker. With little rolling to contend with and no main to block the wind, both sails tend to stay full. Average speeds with this rig are usually impressive.
If you choose to fly a spinnaker, you'll find that it's much easier on a multihull because of the wide foredecks. Occasional surfing down the backside of a wave is normal for a multihull, but consistent surfing is a warning telling you that itís time to reduce sail. While youíre still learning what your boat can do and how it behaves in different conditions, it's best to reduce sail early. The speed of a multihull makes the apparent wind relatively light, so reef as though you were sailing to windward, which you may have to do suddenly.
When youíre maneuvering a multihull under sail in tight anchorages or around docks requires some practice, particularly with some of the heavier cruising cats that lack good, crisp response to the helm. Give yourself some additional time and distance to turn, and be aware of how quickly a multihull can accelerate in a gust or come to a stop once headed into the wind. Just play your main and jib just as you would with a monohull, and once you find your preferred anchoring spot just allow a sufficient amount of runway and head up into the wind so that you can drop your hook. After that you'll be ready to relax and enjoy all of that additional deck space that multihulls offer.
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