Can you run the main engine submerged while still on the dry dock?

Discussion in 'Propulsion' started by scav000, Apr 9, 2024.

  1. scav000
    Joined: Feb 2024
    Posts: 17
    Likes: 2, Points: 3
    Location: Philippines

    scav000 Junior Member

    Might be a stupid question, but has there been any instance of fully running the engine and propellers while the boat is seated on a drydock partially submerged in water (still grounded to check if the shaft are free from vibration)? My first impression is that this is dangerous and should not be attempted but, maybe you guys have experienced this before.

    Engines are two CAT 3152C 1194BKW
     
  2. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    If you run the engines at full power in those conditions, the propellers will cavitate and probably ventilate too. This will cause vibration. However, if it is only to check if the transmission is shifting, then it can be OK.
     
  3. scav000
    Joined: Feb 2024
    Posts: 17
    Likes: 2, Points: 3
    Location: Philippines

    scav000 Junior Member

    I agree, we did not went ahead with it. We just launched the vessel as normal.
     

  4. fallguy
    Joined: Dec 2016
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    Location: usa

    fallguy Senior Member

    Normally, you keep the boat in slings for minor system checks. That way, if something is wrong, you can pull it right back out.
     
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