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The top deck of the boat or ship rides on pillars but is only tied down by a catch similar to those on skis.
Should the ship or boat start to sink, all passengers can rush to find a spot on the top deck & hang on as they have been instructed that it will remain afloat & unpowered, but afloat long
enough for a rescue. Long enough to be towed to the nearest port if neccessary.
Carley float
http://lean.bfi.org...e&thumb=bfi-00m-m7f
A Carley float in action [oneoffdave, Mar 14 2006]
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What if the boat turns turtle?
sp. "buoyant", "detachable" |
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//Isn't this a lifeboat?// Carley float. |
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Depending on the size of the boat/ship and the sea stte this may be worse than being in separate lifeboats or on floats. Some form of hydrostatic release should be used or the first good wave to break green over the boat will take the roof off. |
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It begs the question, why not an insubmersible boat? |
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I will remind you that boats were formerly made entirely of insubmersible and detachable materials (i.e., wood). People still went down with their ships. |
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The boat itself has to be insubmersible, or you get sucked down in its wake when the boat sinks. (This is why you are advised to swim well away from a sinking ship when it's going down.) |
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So, you're basically putting a boat with no ballast on top of a boat. Or within a boat. Either way, you're building a liferaft, just on a grand scale. |
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