航海英语 航海英语 anchoring, mooring and rafting.ppt

* Rafting is a great way to socialize, or to make efficient use of a limited supply of moorings or docks. Once rafted up, you can move from boat to boat along the chain One boat is secured to the mooring, the rest are secured, using an adequate supply of fenders, to the first boat. This should be accomplished symmetrically if more than two boats are rafted * Fenderboards are especially useful in rafting as they provide protection that will not roll away A fenderboard can be made from two standard round fenders attached to a board. Fenders come in many sizes and shapes. Make sure you use fenders that are large enough and positioned to protect all parts of the hull that may come in contact. * Here is an example of side by side rafting * Here is an example of aft to aft rafting * Here is a variation on the Bahamian Moor except the rear anchor is replaced by fenders and lines to other boats. * * The anchor line is called a rode It extends from the bow of the boat to the anchor deployed some distance away from the boat The overall length is important – which we will discuss next * Two primary materials are used to construct a rode – line (or rope) and chain Nylon is the most popular type of line – generally three strand line is used (it stretches better than braided) Nylon is less costly and lighter than chain It also stretches which provides a degree of shock absorbing as the boat is moved about by waves and wind Nylon can become worn, especially on the bottom or rubbing within the chocks on the boat It is certainly easier to handle and work with than chain Chain is rugged and heavy It’s also more expensive But is offers better holding power than rope It’s so heavy that it hangs in a deep catenary (discuss next) Since it does not stretch, it offers little shock absorbing Will not wear like line If plastic coated – it must be inspected or tested for rusting inside the coating and possible failure Usually, rode made up of both – chain near anchor * This is in