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Clinker-built, also known as lapstrake-built, [1] [2] is a method of boat building in which the edges of longitudinal (lengthwise-running) hull planks overlap each other. Where necessary in larger craft, shorter hull planks can be joined end to end, creating a longer hull plank ().
The reason for this is that when the boat is level, the drain or other opening will always be above the waterline, and so water will only flow out. At sea, when the boat rolls in the waves, the opening may sometimes be below the waterline. If the seacock is open, water may flood the boat, causing it to sink. Sea valve at lower right
Assembling a ship hull's planks by mortise and tenon joint strengthened with dowels. This construction technique relied extensively on structural support provided by peg-mortise-and-tenon joinery through the shell of the boat. This method of ship construction appears to have originated from the seafaring nations of the Mediterranean, although ...
Carvel built or carvel planking is a method of boat building in which hull planks are laid edge to edge and fastened to a robust frame, thereby forming a smooth surface. Traditionally the planks are neither attached to, nor slotted into, each other, having only a caulking sealant between the planks to keep water out.
Cutaway long keel. The Baba 30 is made of a solid GRP (glass reinforced plastic) hull moulded with plank lines to give the effect of a timber hull.Alternating layers of 1.5oz Mat and 24 ounce woven roving were used in the hull's construction, six layers of this were used on most of the hull but 10 - 12 layers were used around the keel.
Then, on a single day, the cement is applied by a team of plasterers. The cement:sand ratio is a very rich 4:1. As the hull thickness is typically 2.5 to 3 cms, ferrocement is unsuitable for boats less than about 15 metres LOA as there is a weight penalty; above that length there is no penalty. Properly plastered ferrocement boats have smooth ...