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

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

Thread Status:
Not open for further replies.
  1. dskira

    dskira Previous Member


  2. Yobarnacle
    Joined: Nov 2011
    Posts: 1,634
    Likes: 65, Points: 0, Legacy Rep: 851
    Location: Mexico, Florida

    Yobarnacle Senior Member

    What would you name it?
    "GLUB GLUB glub" ? :p
  3. allwet
    Joined: May 2014
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: USA

    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
    Joined: Oct 2013
    Posts: 431
    Likes: 8, Points: 0, Legacy Rep: 83
    Location: GulfCoast

    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
    Joined: Dec 2012
    Posts: 189
    Likes: 0, Points: 0, Legacy Rep: 6
    Location: Devon

    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.

    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
    Joined: Feb 2011
    Posts: 2,750
    Likes: 73, Points: 48, Legacy Rep: 579
    Location: Ft. Worth, Tx, USA

    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
    Joined: Mar 2015
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Norge

    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
    Joined: Jul 2015
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Pdx, OR USA

    Umi_Ryuzuki New Member

  9. Jamie Kennedy
    Joined: Jun 2015
    Posts: 541
    Likes: 9, Points: 0, Legacy Rep: 117
    Location: Saint John New Brunswick

    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
    Joined: Oct 2013
    Posts: 431
    Likes: 8, Points: 0, Legacy Rep: 83
    Location: GulfCoast

    NavalSArtichoke Senior Member

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

  14. whitepointer23

    whitepointer23 Previous Member

    Ok i thought it was a conning tower.

  15. Mr Efficiency
    Joined: Oct 2010
    Posts: 6,921
    Likes: 191, Points: 63, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    Probably an alternate, informal description.
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.
Thread Status:
Not open for further replies.