Large ship being lifted by Helicopters

Discussion in 'Boat Design' started by Devu De Goa, Dec 22, 2016.

  1. Devu De Goa
    Joined: Jul 2015
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    Devu De Goa Junior Member

    Just came across this post on a professional website:
    www.linkedin.com/hp/update/6217592402329329664

    "Mr. Sadullah ALTAY has sent out this fascinating post of a ship being lifted by Helicopters and asked a question. I thought of sharing this as this is quite imaginative. Regardless of veracity of the photograph, the questions that need to be asked are: 1. What size load can be lifted by the four helicopters? 2. How many helicopters will it take to lift such a load? The answers will then give rise to numerous possibilities!! Any feedback would be fantastic and a share to get feedback would be much appreciated. Regards, Baljit."

    Considering this hypothetical situation, do you think such a thing is possible?
     

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  2. daiquiri
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    daiquiri Engineering and Design

    The helicopters in the picture seem to be Sikorsky S-64, which can lift a payload of 9t.
    Hence, 4 such helicopters can lift 4x9t=36t.

    Here comes a question for you:
    Does the ship in the picture look like something that weighs 36 t?
     
  3. tom28571
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    tom28571 Senior Member

    Short answer is no. Long answer is that if all it takes to be fascinating is to make up fake preposterous photographs, then it goes a long way toward explaining our latest presidential election.
     
  4. Devu De Goa
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    Devu De Goa Junior Member

    :D On top of that it's a loaded ship.

    An answer in that thread is : "In the picture you have 4 Sikorsky Skycranes. Each Skycrane has a maximum payload capacity of just over 9 tons, giving a combined lifting capability of 36 tons. That ship is at a guess is 15,000 tons so 417 Skycranes would be needed ................. The only device available to lift a vessel of this size would be a semi-submersible barge."
     
  5. TANSL
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    TANSL Senior Member

    Have you ever heard of floating docks (not barges), dry docks and other artifacts that I do not know how they are called in English but that you can see in the photo?. As you can see, there are several other systems, sufficiently proven, that make it unnecessary to resort to helicopters.
    Have you ever thought of the shear stress transmitted by the suspension ropes to the hull of the ship?.What if, for example, the wind unbalances the helicopters and one of them has to bear much more load than the others ?. In sort, your hypothetical operation does not seem very viable.
     

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    Last edited: Dec 24, 2016
  6. JosephT
    Joined: Jun 2009
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    JosephT Senior Member

    Oh ships can fly indeed. I found it on the internet. It must be true.

    [​IMG]
     
  7. Devu De Goa
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    Devu De Goa Junior Member

    :D Another answer on that thread: "a S-64 skycrane can lift about 12.5 tons, the four of them together could lift one of the coastguard boats in the foreground ...but only when they pull vertical, not sideways as in the picture. Hence question no. 3: How many minutes does it take to photoshop a picture and fool 100 viewers???"
     
  8. Mr Efficiency
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    Mr Efficiency Senior Member

    Question of the year ! I know some Soviet-era helicopters could lift around 25 tons, no mean feat, and the rotor blades would bend like bananas.
     
  9. mydauphin
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    mydauphin Senior Member

    I have to tell the guy next to me that owns a boat yard. He has all these expensive large cranes to life these small 40 to 60 foot boats. I mean if I could lift my little boat, it is only like 60-70 tons with a few balloons or even a few helicopters...

    Btw, it is not just the lifting ability but also the length of the arm, lifting a 60 ton boat usually requires a 120 ton crane...
     
  10. Rurudyne
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    Rurudyne Senior Member

    Well, if the ship were made of ultralight Unobtanium and the S-64s powered by Unbelievium maybe....
     
  11. sasansaki
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    sasansaki New Member

    this is not real but the better way for ship lifting is the airbag
     
  12. RHP
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    RHP Senior Member

  13. sasansaki
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    sasansaki New Member

    hi my friend RHP we have the same experience in anzali port in iran but we use airbag for lifting and lunching the ship
     
  14. RHP
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    RHP Senior Member

    That my friend is because Persians are very old and wise people. We in the West have yet to fully understand your technology which is why we still use tugs. Maybe in the future......
     

  15. sasansaki
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    sasansaki New Member

    i am so sorry but i mean this kind of air bag
     

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