Is it possible to combine a sailboat, motorboat and submarine?

Discussion in 'Motorsailers' started by tahroo, Sep 14, 2012.

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  1. dskira

    dskira Previous Member

    1833

    [​IMG]
     
  2. Yobarnacle
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    Yobarnacle Senior Member

    What would you name it?
    "GLUB GLUB glub" ? :p
     
  3. allwet
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    allwet Junior Member

    slightly submersible?

    What about a surface boat that can go down to 50' or so to ride out a storm instead of bouncing around on the surface? There would be some rolling but much less than at the surface.
     
  4. NavalSArtichoke
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    NavalSArtichoke Senior Member

    There was a chap on these forums who wanted to combine a submarine with a train, locomotive and all, so I guess anything's possible. Whether or not anyone would want it is another thing entirely.
     
  5. Mik the stick
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    Mik the stick Senior Member

    My ad vice is DON'T DO IT.Its just not worth it.
    My preliminary very ball park calculations predict 22hp for 5kt underwater speed in a 48*14*12ft boat. Which with a 24v motor is 684 amps or 149 amps with an inverter giving 110 volts. Diesel electric drive is the sensible way to go.

    Problems
    Assumming batteries are 60amp/hr three connected in parallel give 180Amp/hrs which would run for an hour at Max speed which is usually the best a WW2 sub could do.

    As a sub goes under it must be kept stable, to go down to 50ft (measured to the keel) I will say takes 50 tons of water. As depth increases the sub is crushed so that 55 tons of water starts the boat sinking again. But at 65 feet the boat displaces less water than before. So to stop the boat diving perhaps 7 tons of water will need to be pumped out.

    WW2 subs could dive to 200-300ft which generally equaled their length. So a reasonable dive depth would be perhaps 90ft with double that as an absolute crush depth. If 55 tons of water caused a dive speed of 10ft/sec, then 5 seconds after the start of the dive your dive speed will increase and if you don't get some water out of the boat you won't be able to stop diving and you could reach crush depth before you can react to the situation. A failed compressed air valve is a death sentence.

    The required training to get that right I think is beyond most people. The need to have someone to help you compounds the problem. That is why submariners tend to be a very elite group in any navy.
     
  6. upchurchmr
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    upchurchmr Senior Member

    Not true.
    I was on a US sub (missile) in 1985 at 300' taking 50 degree rolls.
    It was a really big typhoon. Upset my poor tummy quite a bit.

    Actually it was probably a lot less than on the surface, it just didn't seem like it at the time.

     
  7. Padillac
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    Padillac New Member

    Sleeping beauty..

    Actually during WW2, a one man wetsub was developed in UK that could be sailed and paddled as well as powered electrically. Google "sleeping Beauty" as was its codename.
    Only barely a sub of course, but interesting enugh. One specimen is on exhibit in the Naval Muesum of Horten, Norway.

    A malicius canoe if there ever was one :D
     
  8. Umi_Ryuzuki
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    Umi_Ryuzuki New Member

  9. Jamie Kennedy
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    Jamie Kennedy Senior Member

    US Submarines are boats, with motors, and a sail, but they are not motor-sailboats. ;-)
     
  10. exp30002

    exp30002 Previous Member

    How about a submersible catamaran type of vessel, that
    could flip like the Scripps vessel, the Flip? It could probably ride out a storm.
     
  11. whitepointer23

    whitepointer23 Previous Member

    Do they have a sail
     
  12. exp30002

    exp30002 Previous Member

    Not yet.
     
  13. NavalSArtichoke
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    NavalSArtichoke Senior Member

    Yes, they do. The big sticky up thing with the periscopes and whatnot is called a 'sail':

    [​IMG]
     
  14. whitepointer23

    whitepointer23 Previous Member

    Ok i thought it was a conning tower.
     

  15. Mr Efficiency
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    Mr Efficiency Senior Member

    Probably an alternate, informal description.
     
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