Transom repair

Discussion in 'Boat Design' started by Jbmdisco, Jul 8, 2017.

  1. Jbmdisco
    Joined: Jul 2017
    Posts: 2
    Likes: 0, Points: 1
    Location: Scotland

    Jbmdisco New Member

    Hi,
    I am converting my vessel from 2 x outdrives to shaft. The transom is fiberglass with 2" of ply as re-enforcement. I am about to glass the outdrive apertures but the plywood is suffering from severe rot. Given I am going to shaft and the transom is 3/4" glass, can I remove the ply without having to replace it? I am assuming the purpose of the ply would be for mounting the outdrives?
     
  2. jorgepease
    Joined: Feb 2012
    Posts: 1,614
    Likes: 46, Points: 48, Legacy Rep: 75
    Location: Florida

    jorgepease Senior Member

    Grind it out and replace it with Coosa Board is what I would do. Leave the glass intact and paste the coosa too it.
     
  3. Jbmdisco
    Joined: Jul 2017
    Posts: 2
    Likes: 0, Points: 1
    Location: Scotland

    Jbmdisco New Member

    Thanks for reply.
    Unfortunately coosa isn't available in uk. I have found some flat preformed grp panels which I am thinking of cutting to shape and glassing to inside of transom then lay up from the outside.
     
  4. jorgepease
    Joined: Feb 2012
    Posts: 1,614
    Likes: 46, Points: 48, Legacy Rep: 75
    Location: Florida

    jorgepease Senior Member

    Make sure it's high density
     

  5. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    If the transom is no longer required to bear the load of engine thrust, much of the strength requirements are no longer there. Is the 3/4" a single solid laminate, or spread over two sides of the ply ? The biggest problem you have there is getting the holes left where the outdrives were, properly covered, which requires the feathering back of the edges over several inches, giving a smooth transition from the old to the new. You certainly need something to bridge the gaps temporarily, as a backing, while you complete the glassing. But there is no need to put any ply etc in there permanently this time, that I can see.
     
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