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A bubble curtain is a system that produces bubbles in a deliberate arrangement in water. It is also called pneumatic barrier. The technique is based on bubbles of air (gas) being let out under the water surface, commonly on the bottom.
Yermak, the world's first icebreaker with a pneumatic anti-icing system. A pneumatic anti-ice system is a technology that uses air or another gas to prevent ice buildup on ships sailing in icy waters. It is housed below the waterline on the ship's hull. Pneumatic anti-ice systems use compressed air or engine exhaust as the working gas, which is ...
Corvette fenders and boat dinghies are commonly manufactured this way. It is very different from the hand lay-up process. The difference comes from the application of the fibre and resin material to the mould. Spray-up is an open-moulding composites fabrication process where resin and reinforcements are sprayed onto a reusable mould.
A further application of the pneumatic barrier is to decrease the salt-water exchange in navigation locks and prevent salt intrusion in rivers. . [1] Pneumatic barriers are also known as air curtains. The pneumatic barrier is a (non-patented) invention of the Dutch engineer Johan van Veen from around 1940 . [2]
(The axial movement of cones is not mandatory, however; a split bushing squeezed radially with a linear force—e.g., set screw, solenoid, spring clamp, pneumatic or hydraulic cylinder—achieves the same principle without the cones; but concentricity can only be had to the extent that the bushing's diameters are perfect for the particular ...
Strip-built, or "strip-plank epoxy", is a method of boat building. [1] Also known as cold molding, the strip-built method is commonly used for canoes and kayaks, but also suitable for larger boats. The process involves securing narrow, flexible strips of wood edge-to-edge around temporary formers.