Emergency Sailing With 1 Side Engine

Discussion in 'Hydrodynamics and Aerodynamics' started by naserrishehri, Oct 29, 2024.

  1. naserrishehri
    Joined: Jun 2006
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    naserrishehri Senior Member

    Dear friends
    Good day
    There is a crewboat with 2 engines. this crewboat can not go ahead straight with one side engine in emergency condition.
    Is it a fault of design?
    Is there any way to solve this problem?
     
    Last edited: Oct 29, 2024
  2. BlueBell
    Joined: May 2017
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    BlueBell . . . _ _ _ . . . _ _ _

    Yes, turn the steering wheel in the opposite direction until the boat goes straight.
     
  3. kapnD
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    kapnD Senior Member

    A drogue deployed from a stern cleat may help in an emergency.
     
  4. naserrishehri
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    naserrishehri Senior Member

    Thanks.would you please explain more.
     
  5. bajansailor
    Joined: Oct 2007
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    bajansailor Marine Surveyor

    A drogue is also called a sea anchor - it could typically be shaped like a parachute, or a cone (or even a series of cones).
    If you stream a drogue from one side of the stern on a crew boat (which probably has a wide transom), then this might help to counteract the effect of the single propulsion engine wanting to turn the vessel.
    Can you tell us a bit more about the vessel please?
    Size, power, perhaps even a photo or two?
     
  6. BlueBell
    Joined: May 2017
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    BlueBell . . . _ _ _ . . . _ _ _

    Can the stopped engine be taken out of gear so the propeller spins freely?

    Also, anything can be used as a drogue, even an old tire on a line.
    However, great care must be taken not to engage the line with the only remaining turning propeller.

    It is not the best design, no.
    One should be able to steer a course with only one of two engines operating.
     
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  7. kapnD
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    kapnD Senior Member

    A snubber attached to the drogues rode can help to steer the boat, as can the amount of throttle applied.
    Some experimentation should get you on a course of sorts, at least close enough to your destination to call for help.
    I once lost a rudder aboard a single inboard fishing boat far from any help. It tracked fairly straight without a rudder when on plane, but the trick was to get it on plane headed in the right direction!
     
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  8. fallguy
    Joined: Dec 2016
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    fallguy Boat Builder

    Need more details about the engines to answer best.

    If you have a heavy helm with one engine; the most likely scenario is the other engine was in gear.
     
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  9. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    Drogues and steering with it like a horse reins? If this is an inboard installation with rudders it is usually possible to steer with the rudders. With routinely do that while fishing trolling.
     
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  10. naserrishehri
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    naserrishehri Senior Member

    We did what you said but the vessel turns around herself.
     
  11. gonzo
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    gonzo Senior Member

    Are the rudders behind the propellers?
     
  12. BlueBell
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    BlueBell . . . _ _ _ . . . _ _ _

    There is something seriously wrong here.
    Perhaps with the boat, maybe with communications, or maybe you're having us on.

    Pictures please with explanations of what we are looking at.
     
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  13. naserrishehri
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    naserrishehri Senior Member

    Yes
     
  14. gonzo
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    gonzo Senior Member

    I mean if they are directly behind.
     

  15. BlueBell
    Joined: May 2017
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    BlueBell . . . _ _ _ . . . _ _ _

    How big or small are these rudders?

    Pictures please.
     
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