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All vessels have keels, it is the backbone of the hull. In traditional construction it is the structure upon which all else depends. Modern monocoque designs include a virtual keel. Even multihulls have keels. On a sailboat the word Keel is also used to refer to the area that is added to the hull to improve its lateral plane. The lateral plane is what prevents leeway and allows sailing towards the wind. This can be an external piece or a part of the hull.
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Because of their relatively low cost and the freedom they afford to owners, personal water craft are widely used for recreation. However, many U.S. states require safety training for personal watercraft operators. Modern PWC include a lanyard attached to a dead man's switch, to turn off the vessel if the operator falls off -- provided the lanyard is attached to the operator.
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There is no engineering limit to the size of jet boats, though the validity of their use depends a lot on the type of application. Classic prop-drives are generally more efficient and economical at low speeds (up to about 20 knots) but as boat speed increases beyond this the extra hull resistance generated by struts, rudders, shafts etc means waterjets are more efficient in the 20-50 knot range. Also, in situations where you need very large propellers turning at slow speeds (such as tug boats) the equivalent size waterjet would be simply too big to be practical. For these reasons the vast majority of waterjet units are installed in high speed vessels and in particular situations where shallow draught, manoeuvrability and load flexibility are main concerns.
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Boating, Sailing And Marine Galore
Sailing crew wanted from Halifax To Scandinavia.
Mon, 20 Aug 2007 11:13:19 +0200
Need one experienced sailing crew member to sail yacht from Halifax to Copenhagen. We can sail Monday August 27. Right now we are 3, but one has got a back injury. It's a Morgan Out Island 41'. Speak English, German, Danish - Share food and Diesel expenses. It's non payed position.
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Sydney Harbour Sea Trials - Seeking Sailing Crew
Sun, 16 Sep 2007 12:26:08 +0200
Seeking sailing crew for 44' steel cutter. Join on Sydney Harbour. Yacht is coming to the end of a major refit so initially short trips (1 to 4 hours) are envisaged. Initial destinations are not important, so by route by negotiation.
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Sailing Crew Wanted From Gibraltar To St Lucia With Arc 2007.
Mon, 27 Aug 2007 18:23:05 +0200
Boat details: Island Packet 420 - 44 foot cruising sloop, fully equipped for long range sailing with two onboard chart plotters, genset, solar panels, wind generator, watermaker, SSB, AIS, radar, and all safety equipment required and recommended by the ARC committee. Sailing crew needed.
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Mercury Marine cuts deeper into workforce
Thu, 11 Dec 2008 19:21:04 GMT
A decline in boat sales has Mercury Marine cutting deeper into its Fond du Lac workforce.
jet skis | jetski | kawasaki jet ski
posted by Tjalk @ 6:26 AM
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