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marine rescue

 Rescue aid
 
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In case of a capsized small craft.. marine rescue workers could place inflation tubes under capsized craft and inflate with an onboard compresser on rescue vehicle. This would lift the capsized vessle enabling a rescue of trapped people underneath .....In our community recently there was a capsized vessle.... in which 5 people perished. There were rescue people on the scene... { coast guard} within 15 minutes, but were unable because of restrictions to be of any assistance. They had to wait until the Navy was on the scene. which took 90 minutes
—les2, Sep 02 2002

Car flotation airbags http://www.halfbake...n_20airbag_20system
This idea could be adapted. [8th of 7, Sep 04 2002, last modified Oct 04 2004]

Roll Aid http://www.roll-aid.com/
For kayaks. You just want something a bit bigger. [DrCurry, Sep 04 2002, last modified Oct 21 2004]

Davis Submerged Escape Apparatus http://dspace.dial....rish/people/rhd.htm
Also functions as a lifejacket. Many possibilities. [8th of 7, Sep 04 2002, last modified Oct 21 2004]

[link]






       In the scenario you describe, the floatation device wouldn't have done any good anyway. Having said that, how long do you think it would take to put this device in place and inflate it? I imagine it would be somewhat longer than you can hold your breath.   

       Now if you were to build it into the hull....
—phoenix, Sep 04 2002
   

       You really want to roll the capsized vessel back over, and then keep it afloat, rather than lift it out of the sea (given the relative amounts of energy required). I am sure you could design a flotation device to do that.   

       Whether you could deploy it in heavy seas is another matter. On the principles of the link, I would suggest it would be best if it were already mounted on the boat.
—DrCurry, Sep 04 2002
   

       A very long telescopic keel, that upon capsize would extend and flop to one side a little, thus moving the CoG and tipping the boat over.
—NickTheGreat, Sep 04 2002
   
      
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