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Semi-trailer aerodynamic devices are devices affixed to semi-trailers, for the purpose of reducing aerodynamic drag caused by air turbulence.The two major types of device in use are trailer skirts (or side skirts), affixed to the underside of trailers, and trailer tails (or boat tails, or rear fairings), affixed to the rear.
During a storm, daggerboards can help reduce the tendency of a small boat to tip over ("breach") due to waves. A catamaran in a storm would lift the leeward hull daggerboard and fully extend the upwind daggerboard. [citation needed] If there is no wind and an outboard motor is being used, lifting the daggerboards will ensure the least drag. [3]
A long narrow centreboard produces less drag than a short, wide one for a given amount of lift, resulting in a faster boat that can point closer into the wind. A fore and aft, pivoting centreboard can also be used to move the centre of lateral resistance aft to match a change in sail plan, such as furling or dropping the jib.
The bow of the German schooner SS Amphitrite, showing trailboards running from the billethead to the hawsepipe. The trailboards are a pair of boards that may be found at the bow of certain sailing vessels, where they run from the figurehead or billethead back to or towards the hawsepipe.
The bilgeboards are angled so that as the boat heels, or leans under the force of the wind, the leeward bilgeboard becomes more upright, and provides the greatest possible force in the desired direction. Like a centerboard, the bilgeboard can be used as a recovery platform upon which to stand in the event the dinghy overturns via a capsize or ...
The steering oar or steering board is an over-sized oar or board, to control the direction of a ship or other watercraft prior to the invention of the rudder. [ 1 ] It is normally attached to the starboard side in larger vessels, though in smaller ones it is rarely, if ever, attached.