Plug a transducer hole through hull

Discussion in 'Sport Cruisers' started by Ship Tzu, Feb 17, 2018.

  1. Ship Tzu

    Ship Tzu Member

    89
    Nov 29, 2008
    London
    Sundancer 250DA 1995
    5.7L V8
    Hi Guys, what what you advise?
    I believe the hole is 75mm through 25mm ply hull, would you plug it with ply first, and how?
    Or, would you fibre glass it throughout the hole?
    I have to do this job before he goes back in the water, very soon!

    Advise appreciated, I can't make up my mind.
    Cheers,
    Tony.
     
  2. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    The hull should be solid fiberglass. There is plywood in the transom, but the hull bottom has no wood. However, if this is the original ducer, it's quite possible that there is a piece of plywood glassed to the inside of the hull (a "mounting pad"). If you're eliminating the ducer, you can eliminate the plywood mounting pad, as well.

    Fixing it... honestly, the easiest thing to do is leave the old transducer in place. If that's not a possiblity you could use plywood to fill the majority of the hole, but can also (ideally) be done with glass and thickened epoxy. However, either way, you're going to grind both sides (outside and, ideally, the inside too)) of the hole to create an hourglass-type shape when looking at the hole from a cross-section viewpoint. The distance to grind it is about a 12:1 ratio. This is not simply a "glue a plug in the hole and go boating" type of thing. It will take good amount of time and effort to do it right.
     
    Last edited: Feb 17, 2018
  3. Ship Tzu

    Ship Tzu Member

    89
    Nov 29, 2008
    London
    Sundancer 250DA 1995
    5.7L V8
    Thanks Lazy Daze, yes I think at least or this season I'll replace the transducer, I'm aware it's not just "plugnplay" lol.
    Good advise, thanks again.
     
  4. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    You're welcome!
     
  5. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    Or your other option is to install a seacock and plug it.
     
  6. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Good idea, but the problem is that the transducer is much larger in diameter than the thru-hull for the seacock. It would still require the same amount of glass work.
     

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