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The generated vibrations are also compared with the natural frequencies of the different parts/sections and adaptions can be done to the structure. On board, noise travels through the structure (mainly low frequencies), more than through the air, so insulating the engine room is not enough as a way to avoid the noise travelling through the boat ...
The boat is then righted, bailed out, and the sails reset, so that in the event of an uncontrolled capsize, the boat and its occupants are familiar with the procedure and may recover. Most small monohull sailboats can normally be righted by standing or pulling down on the centreboard , daggerboard (or bilgeboard in a scow ) to lift the mast ...
Springing as a nautical term refers to global (vertical) resonant hull girder vibrations induced by continuous wave loading.When the global hull girder vibrations occur as a result of an impulsive wave loading, for example a wave slam at the bow (bow-slamming) or stern (stern-slamming), the phenomenon is denoted by the term whipping.
Of the 156 German submarines ("U-boats") surrendered to the Allies at the end of World War II, 116 were scuttled by the Royal Navy in Operation Deadlight. Plans called for them to be scuttled in three areas in the North Atlantic Ocean west of Ireland , but 56 of the submarines sank before reaching the designated areas due to their poor material ...
The strength of ships is a topic of key interest to naval architects and shipbuilders. Ships which are built too strong are heavy, slow, and cost extra money to build and operate since they weigh more, whilst ships which are built too weakly suffer from minor hull damage and in some extreme cases catastrophic failure and sinking.
For more than a decade along the East Coast and Gulf of Mexico, millions of farmed oysters, which are grown in cages or bags in tidal areas, have fallen victim to Sudden Unusual Mortality Syndrome ...
The term oyster reef refers to dense aggregations of oysters that form large colonial communities. Because oyster larvae need to settle on hard substrates, new oyster reefs may form on stone or other hard marine debris. Eventually the oyster reef will propagate by spat settling on the shells of older or nonliving oysters. The dense aggregations ...
Here’s what experts and science have to say about these well-known food aphrodisiacs — and whether they actually help put people in the mood.