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, which use underwater wings or struts to lift the vessel clear of the water, standard jetboats use a conventional planing hull to ride across the water surface, with only the rear portion of the hull displacing any water. With the majority of the hull clear of the water, there is reduced drag, greatly enhancing speed and maneuverability, so jetboats are normally operated at planing speed. At slower speeds with less water pumping through the jet unit, the jetboat will lose some steering control and maneuverability and will quickly slow down as the hull comes off its planing state and hull resistance is increased. However, loss of steering control at low speeds can be negated by lowering the reverse deflector slightly and increasing throttle - so you increase thrust and thus control without increasing boat speed itself. A conventional river-going jet boat will have a shallow-angled (but not flat-bottomed) hull to improve its high speed cornering control and stability while also allowing it to traverse very shallow water. At speed, jetboats can be safely operated in less than 3 inches to (7.5 cm) of water.
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Jet Ski is the brand name of personal watercraft (PWC) manufactured by Kawasaki Heavy Industries, Ltd.. The name, however, has become a genericized trademark for any type of personal watercraft. Jet Ski (or JetSki, often shortened to "Ski"[1]) can also specifically refer to versions of PWCs with pivoting handlepoles known as "stand-ups".
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Traditional sailboats are monohulls, but multi-hull catamarans and trimarans are gaining popularity. Monohull boats generally rely on ballast for stability, and generally are known as displacement hulls. This stabilizing ballast can be on the order of multiple tons of lead, for a 12m (39 Ft.) boat. However, it creates two problems; one, that this gives the monohull a tremendous inertia, making it less maneuverable and reducing its acceleration. Secondly, if the boat ever fills with water, it will sink immediately, without question.
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Enjoy an ideal playing ground both for novice and expert windsurfers.he environment alone offers a healing respite, with the low humidity, seawater, sun, and black sands surrounding the senses like the mountains surround the city.
Navigation software - what is good for use on a sailing yacht?
Mon, 13 Aug 2007 19:45:17 +0200
Hi, just a quick question - I've been looking for navigation software and found there is lots of it for sailing yachts. I came across a program called Software on Board that runs C Maps. So, I was just wondering if anyone has this and can tell me what it's like. Can anyone tell me what type of GPS antenna would be best (an internal or an external)? My boat is aluminium and I'm not sure how the signal would go through aluminium, and, is the accuracy of these units as good as each other?
Full discussion ....
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