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  1. AngelAlvarez

    Barge Mounted Crane

    I do not have all the details but check if there are any tanks to be used to balance the barge during loading and also check at what angles you will take the cargo load and unload it . As kander pointed out it is risky business and before putting any load on it just calculate the angles of...
  2. AngelAlvarez

    More effective - bow thrusters or stern thrusters?

    Contrary to what some poeple might think putting a relative small ship in a pier with no tugs in complex meteo conditions a lot of times is just impossible no matter how skilled you or your pilot are. One thing is a Naval ship, with mainly hughe power to displacement ratio -compared to...
  3. AngelAlvarez

    Using the same sea-water pump for refrigeration and air-conditioning

    Sorry I didn't replay before. You will be using just one pump so the only thing you need to have is to attach the pump wiring to the pump switch on the air conditioner and also to the pump switch of the refrigeration system. Just check that the switches you are using allow this type of...
  4. AngelAlvarez

    More effective - bow thrusters or stern thrusters?

    IRstuff: You are right saying that if you applied the same amount of thrust at the extremes outboard location of a ship, you can generate more torque. We mainly are talking about physical considerations. From this point of view, in fact we can look at two problems: 1 To steer the bow 2 To...
  5. AngelAlvarez

    More effective - bow thrusters or stern thrusters?

    Tobbe is right: Some cruise ships, Ro-Ro and Ferries use stern thrusters even they might have twin engine instalations. On some ships with twin engine installation, the distance between the shafts is so relatively short with respect to the length of the ship that is hard to move the ship...
  6. AngelAlvarez

    More effective - bow thrusters or stern thrusters?

    It all depends on the specifics of your ship -boat. With a twin engine configuration, forget about the stern thruster, you just do not need it. As a rule when you have both thrusters, the bow thruster is the more powerfull one because you can use your engine and rudder to assist the control of...
  7. AngelAlvarez

    Electrical overload at bow area

    About what loads and distances we are talking about? Distance between housing batteries and the bow? Distance between starting batteries and the bow? Load from bowth. and windlass?. Do you need to use both starting batteries? Maybe with one you can make it. Do you have a parallel switch? Best...
  8. AngelAlvarez

    Using the same sea-water pump for refrigeration and air-conditioning

    If the waterflow is enough to run both the air conditioner an the refrigeration system, there are no problems. You just need the electrical circuity to start the pump when any of the systems will be working.
  9. AngelAlvarez

    More effective - bow thrusters or stern thrusters?

    There are many reasons why some ships and boats use bow thrusters. . A twin engine boat or ship will need only a bow thruster and move sideways with no major difficult. . . A one screw boat will not necessarily need an stern thruster. With some experience you can make the vessel to move...
  10. AngelAlvarez

    Engineering dept staffed with unqualified "engrs"

    Happy New Year to all! While these topics can be debated for ever, I want to add some words to what you already wrote: For some reason I feel better if I think that the guy that designed the bridge I'm crossing is a graduated, licensed civil or structural engineer with the skills to design a...
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