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Catamarans are the perfect boats to dry out on a beach, or, as many do in tidal areas (including ourselves), use a half tide drying mooring. If the boat has daggerboards then sensibly the rudders should lift to avoid damage, especially if the tide/wind causes waves when refloating. I have used the method seen in this video for 40 years. Very simple and works easily. Please note that this boat is over 30 years old, and I had never tried to lift the rudders with one hand before! Hence the initial hesitation. They would lift more easily if the shafts were greased. A simple snap hook holds the rudder up. Some people use "dinghy style" lifting rudders but that means the blades stick out behind the boat, which has often led to breakages when in a crowded anchorage and unsuspecting dinghies pass in the night. This rudder system works exactly like a conventional semi-balanced rudder when it in the down position. And has the advantage that the whole rudder can be taken off the boat by simply undoing one bolt. And no shaft leaks either! The thin ropes led through blocks to a cleat on the tiller are connected to the outboard. So the engine turns with the rudders, significantly increasing manouverability! I write more about steering systems on my website, see here https://www.sailingcatamarans.com/index.php/19-faqs/sailing-and-performance-questions/109-which-steering-system-should-i-use
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For a review that explains how the Velodyne Martinin 1.5 works: http://features.boats.com/boat-content/2013/03/the-velodyne-martini-1-5-active-suspension-on-a-boat/ For more videos from the Miami Boat Show, visit www.boats.com. The Velodyne Martini 1.5 was the wackiest, and most technically impressive, thing I saw at this year's Miami International Boat Show. In a nutshell, the Martini 1.5—so-named because it will keep your drink from sloshing—is a pontoon boat with active suspension. The system is the creation of Velodyne founder David Hall and a team of very enthusiastic engineers, some of whom were at Miami and gave me a demo ride on the boat. Hall and the Velodyne name may be familiar to audiophiles, as he got his start in 1983 with a patented, accelerometer-based High Gain Servo System to control sub-woofer cone movement. The company, which is based on the fringe of Silicon Valley near Morgan Hill, California, is still in the speaker business and has also developed the Velodyne LiDAR system used for 3D mapping. At Miami, one of the engineers explained that the Martini 1.5 is based on the same premise as their original speaker, "but instead of measuring and reacting to the movement of the speaker cone, we are reacting to the movement of the boat deck to cancel out the action of the waves."