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The Last Ship S01E04 We'll Get There

Discussion in 'Now Playing - TV Show Talk' started by smbaker, Jul 14, 2014.

  1. laria

    laria Librocubicularist

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    I guess maybe I don't understand how the ship propellers work. :)
     
  2. eddyj

    eddyj Señor Member TCF Club

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    Greatly simplified, an electric motor turns electricity into motion. Running it backwards (i.e. forcing the motion) would generate electricity. In other words, an electric motor and a generator are pretty much the same machines, running backwards.

    In real life, this would not work nearly as well as it does in the show. :p
     
  3. Flop

    Flop Member

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    They work in principle similar to your standard fan. A fan draws air from behind it and blows (or propels) it out the front. Think of the propeller as drawing water in from the front side and propelling it behind the ship. If you blow air with enough force/volume into a fan it will cause the fan to spin. If you drag a propeller through the water, it will cause the propeller to spin.

    Whether a couple of parachutes would pull a ship that size with enough velocity to cause the propeller to spin fast enough to generate any meaningful amount of power is questionable at best.
     
  4. Silverman

    Silverman New Member

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    Rather amazing too that the wind was in just the right direction for the island, and also that uninhabited islands have huge fresh water tanks waiting.
     
  5. laria

    laria Librocubicularist

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    Ok... I guess I was just assuming they would hook up the parachutes to the propellers and the wind would turn it and generate some electricity. Not that the ship had to be moving to drag the propeller through the water.

    Maybe the show writers were counting on enough people having slept through all their physics classes like me. :D

    I didn't have too much problem with this. I'm sure there were streams on the paradise island to get water from, and someone (it was Jayne I think... I don't know his name on the show) did warn the captain that he'd just killed the whole ship full of people if he was wrong about the direction of the wind after having wasted all the time they could have been traveling towards the island waiting for the wind to pick up.
     
  6. smbaker

    smbaker Well-Known Member

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    According to the transcript, there was an alternator attached to the impeller:

    This implies to me that it was a separate alternator attached to the impeller, rather than just running the DC motors that drive the impellers backwards. (I'm making an assumption that the impellers are driven by DC motors like a diesel-electric locomotive or a diesel-electric submarine, which could be incorrect; alternatively they could be driven by the diesel engines directly, in which case I would expect the alternators to be attached to the engine rather than the impeller)

    ETA: Propulsion system on Arleigh Burke class destroyers:

    ETA: Electrical system:

     
  7. eddyj

    eddyj Señor Member TCF Club

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    That's why I said "greatly simplified". :p
     
  8. DouglasPHill

    DouglasPHill Active Member

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    Who said it was uninhabited?
     
  9. eddyj

    eddyj Señor Member TCF Club

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    Or that it had huge tanks?
     
  10. DeDondeEs

    DeDondeEs Well-Known Member TCF Club

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    When the crew members were pulling the parachutes off of the HELICOPTER, which I am assuming where they got them, because why else would you have parachutes on a destroyer? Didn't someone think, hey we have a HELICOPTER, that could be used to go find water or land, or if anything to be used as a generator to keep the samples cold?
     
  11. smbaker

    smbaker Well-Known Member

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    I've heard you can modify a 12VDC vehicle alternator to make 120VAC (remove the diodes, do something with the windings, or add a step-up transformer).
     
  12. laria

    laria Librocubicularist

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    Didn't the mapping minion say it was? I thought I remember him mentioning it as a good selling point for that island, because there would be no potential exposure to the virus.
     
  13. classicX

    classicX Don't scream.

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    Miles away...
    True - he said that it was a known island, well mapped, but not inhabited.
     
  14. eddyj

    eddyj Señor Member TCF Club

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    But then, they were going in a random direction by wind power, so who knows if they hit the right island at all!
     
  15. RGM1138

    RGM1138 I wanna Rock

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    That's just crazy talk.




    :p
     
  16. laria

    laria Librocubicularist

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    I don't think the helicopter could have brought that much water back in one trip... even if it could have made it to the island (which seems like it was about 24 hours away in boat speed) they would have needed to make a lot of trips and wasted a lot of fuel.
     
  17. classicX

    classicX Don't scream.

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    Miles away...
    This show is dumb, IMO. Radio silence doesn't mean you can't listen - even in the arctic, they should have gotten some inkling of the state of the world in the time they were there.

    When it becomes difficult to suspend your disbelief, even when trying to do so, I think it's time to stop watching.

    The acting, though there are some bright spots, is generally bad as well.
     
  18. laria

    laria Librocubicularist

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    I have to agree that the storyline on this one was kinda weak and boring compared to the previous ones. :)

    I mean, we knew they weren't going to fail to reach the island and then every one dies, the end.
     
  19. dswallow

    dswallow Save the Moderatоr TCF Club

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    Long...
    I wonder when the ship will run into the side of the dome.
     
  20. smbaker

    smbaker Well-Known Member

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    Water is about 8 lb/gallon. The useful load of an MH-60 helicopter is 6684lb. That's about 835 gallons of water per trip.

    Plus, on the trips to the island, you could have taken passengers (MH-60 capacity is 11) and left them on the Island, reducing the water requirements on the ship.
     

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