submersible boat design help

Discussion in 'Boat Design' started by yileiliu, Apr 6, 2006.

  1. yileiliu
    Joined: Apr 2006
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    yileiliu Junior Member

    hi, i need some help with a boat design. I need to design and build a boat that travels on top of the water, but also can rotate the structure that attaches the sponson to the body such that the boat submerges and travels below the water.

    any references or any help in this type of boat design would be greatly appreciated. thanks!
     
  2. SeaSpark
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    SeaSpark -

    Please define sponson

    Interesting craft but what is a sponson?
     
  3. yileiliu
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    yileiliu Junior Member

    it's the flotation devces for the raft. think of the things that make a hydroplane float.
     
  4. SeaSpark
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    SeaSpark -

    Attached Files:

  5. SeaSpark
    Joined: Mar 2006
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    SeaSpark -

    Sponson definition.

    At wikipedia found this definition: http://en.wikipedia.org/wiki/Sponson

    This definition is very wide, what is the purpose of the sponson you want to rotate?
     
  6. Willallison
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    Willallison Senior Member

  7. yileiliu
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    yileiliu Junior Member

    The boat I have in mind is similar to the one depicted in the picture below. However, I need to make a scale version that is a foot long. The body must also raise out of the water, in the above surface mode. Are there any good references to RC communications that are necessary to make this possible?

    [​IMG]
     
  8. Mayfly

    Mayfly Previous Member

    Most boat of these design would need air and electric from vessel above supplied by cable thus the submerge vehicle would be light and compact without lifesupport and engine on board underwater.

    Above design is a good and cheap where the propulsion is just a nitrogen push propeller with float that hold on to the main cabin. This ensure the driver would retain underwater view without the hassel of complicated dive.
     
  9. boradicus
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    boradicus Senior Member

    Looks like an inverted trimaran. Cool concept vessel!
     
  10. messabout
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    messabout Senior Member

    The center hull will need to be heavier than the water it displaces.

    If you are to build an RC model, make it longer than one foot or you will get into complications with the sponsons ability to support the mid hull and all the servos, batteries etc. Two feet long will be more practical in terms of construction, flotation details, and space for the mechanisms.
     
  11. viking north
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    viking north VINLAND

    Thats an old design from Popular Science/Popular Mechanics . Have you looked up radio controlled model submarines. There was a guy here in Halifax that built one around 12ft (3M) with incrediable performance. I had to keep reminding myself that it was an actual model and not the real thing. --
     
  12. nimblemotors
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    nimblemotors Senior Member

    An issue with this design is the 'sub' would be tied to the surface waves, making for an uncomfortable vessel. My suggestion in another thread is use a cable connection that can tow the underwater craft from the surface craft.
     
  13. boradicus
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    boradicus Senior Member

    Since you don't need to worry as much about structural strength above water, you could conceivably also broaden the beam between the two surface hulls such that their distribution would create a more stable support for the submersible, and use light weight lateral spacers that could be flexibly joined hull to hull so as to better withstand wave turbulence. For that matter, you could construct a flotation mat made of several such members, and use a cable truss to support the submersible observation deck. Perhaps, if it were lean (iinflatable?) enough it could be folded and drug behind on the primary floats by the submersible when above water in order to approach coral reefs for tourist and scientific observation. With a mesh that you can deploy across the water's surface semi-rigidly, you might even be able to use the mesh to push up against a reef and keep the submersible deck at a safe observation distance? Maybe anchors are better suited for that but it's an idea. :idea: Maybe the best lateral spacers would be inflatable, except for the exterior floats that would have to withstand rubbing against the reef - probably they would be coated with kevlar laminate, or something otherwise durable.
     
    Last edited: Jun 8, 2013
  14. portacruise
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    portacruise Senior Member

    What about making the floats so they can be flooded? Maybe set to provide just barely enough buoyancy for righting below the surface, just below wave action? A very low power thruster pushing downward could be used to keep the whole thing stabilized below in a stable region below wave troughs.... If air is needed in the pod, possibly an elastic snorkel. Might be good for a storm survival craft?

    Porta

     

  15. tomas
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    tomas Senior Member

    It can be done but then you will have the water resistance of three submerged hulls instead of one, plus the two upper hulls just below the surface will also produce wave-making resistance.

    A hull should be submerged at least several hull diameters deep to minimize wave-making resistance.
     
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