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B Underwater Propulsion

  1. Jan 29, 2017 #1
    Can water inside a submersible object be pumped outwards to provide an acceleration while underwater?
     
  2. jcsd
  3. Jan 29, 2017 #2

    Bystander

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    Squid?
     
  4. Jan 29, 2017 #3

    fresh_42

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    Isn't this exactly what a propeller does? If you like, you can put the whole system in a tube through the inner of the object, but why?
     
  5. Jan 29, 2017 #4

    Nidum

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    If you mean can water from a tank inside be pumped out to produce thrust then answer is yes but in practice this method of producing thrust is not very practical.

    Generally better to use the water from lake or sea and pump it through or around the submersed object .
     
  6. Jan 29, 2017 #5

    davenn

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    invented in my home country, the Hamilton Jet is the classic example of that
    https://en.wikipedia.org/wiki/Jetboat
     
  7. Jan 29, 2017 #6

    fresh_42

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  8. Jan 29, 2017 #7

    Nidum

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    This is the UK version built by Dowty under licence from Hamilton :

     
  9. Jan 29, 2017 #8

    Nidum

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    Technical :

     
  10. Jan 29, 2017 #9
    Can someone explain how the intake works and the work necessary? Also, can intake be supplied by water flowing inside the system at a location on the system that is "in front of" the moving system, a system which can travel any direction underwater?
     
  11. Jan 30, 2017 #10

    Drakkith

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    The wikipedia article is a good starting point for an overview of a pump-jet: https://en.wikipedia.org/wiki/Pump-jet

    If you're planning to build one then you'll have to get into the technical literature, as teaching you the details would be beyond the scope of this forum.

    I'm sorry but I can't make heads or tails of this.
     
  12. Jan 30, 2017 #11

    CWatters

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    Perhaps Google Bow Thruster?
     
  13. Feb 1, 2017 #12

    sophiecentaur

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    I visited the RNLI Lifeboat museum Pool, UK last year and saw an ancient (1950's?) lifeboat which used water jet propulsion. Nothing new under the Sun. Great for shallow water use.
     
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