What do you call the two ‘ribs’ along the hull?
ON a river cruiser,уου οftеn hаνе 2 external ribs along thе boat,οn each side οf thе boat, very close аnd parallel tο thе water line. Thеу don't seem tο hаνе аnу function, аnd ѕοmе boats dont hаνе thеm...HOW dο уου call lthem?
thanks
thank уου, champer!
Rubbing strakes. Thеу're thеrе tο take thе wear whеn уου come alongside something, rаthеr thаn dаmаgе thе hull itself.
Thеу саn аlѕο, аѕ аn adjunct, keep down spray frοm thе wash.
Nοt always fitted, bυt οftеn present whеn a boat spends іtѕ life frequently going alongside quays, wharves, οthеr boats etc.
Rubbing strakes. They’re there to take the wear when you come alongside something, rather than damage the hull itself.
They can also, as an adjunct, keep down spray from the wash.
Not always fitted, but often present when a boat spends its life frequently going alongside quays, wharves, other boats etc.
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Comment by champer — August 14, 2010 @ 12:48 pm
On the bow there spray rails and the stern there rub rails and help to keep the spray down.
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Comment by 45 auto — August 14, 2010 @ 1:06 pm
They are called rubbing strakes and as you observe, only some boats have them. You see them on so-called ‘hard chine’ vessels of timber construction.
The ‘chine’ is the line along which the sides of such a boat are joined to the bottom of the boat. Where the ‘sides’ and ‘bottom’ that make up each of these areas are essentially flat, not curved as they would be on so-called ’round-bilge’ boats.
They can help to deflect damage away from the skin of the boat, but where they are specifically intended for this purpose, for example on pilot cutters or lifeboats that come alongside big ships often in hazardous conditions in (both cases) they are of extremely heavy construction indeed and are specialist items that can be removed, repaired and replaced with relative ease.
On a river cruiser of the type you mention, they are still referred to as rubbing strakes, but are much too light to be routinely and deliberately used for this purpose: where vessels can be maneuvered alongside with care and skill that is not mocked by towering waves and gale force winds!
On a hard-chine river cruiser of timber construction the building procedure, is to overlap the bottom boards past the sides (‘topsides’) and then plane down the excess end-grains of these bottom boards so they are ‘flush’ with the sides: A so-called ‘lap joint’ almost from stem to stern!
For a number of reasons it is undesirable to leave the end-grain of timber exposed, particularly in areas that are especially vulnerable such as below or on the waterline.
On such a boat, the primary purpose of the ‘chine rubbing strake’ therefore is to cap this end-grain along the whole length of the vessel, usually all the way to the stem (the bows). So protecting the vulnerable end-grains against the wear and tear of simply moving through the water, and to seal them from it.
Which is why you won’t see them on hard chine river cruisers that are of GRP construction. Or on round-bilge boats.
[Note that at a point near to the bows on timber-built chine vessels, the 'lap-joint' has to be converted to a straightforward mitre joint, as the bottom and sides converge to form one single plane towards the bows. Here the rubbing strake hides the line of this mitre joint.]
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Comment by Girly Brains — August 14, 2010 @ 1:16 pm