Recomendations for new transom material?

Discussion in 'Metal Boat Building' started by 85 starcraft, Jan 20, 2007.

  1. tja
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    tja Senior Member

    Tja

    Hello, XL panels made by Greenwood products are used both in aluminum and fiberglass boats. It is guarenteed for life including labor last time I read there web site. Sincerely, Tom.
     
  2. alan white
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    alan white Senior Member

    Thanks, Tom. Labor too? ... they appear to be working hard to overcome some prejudices people have about pressure treated plywood of the construction variety.

    A.
     
  3. tja
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    tja Senior Member

    Tja

    Hello, I went into Greenwood's web site and they have changed it some what. It isn't clear if they cover labor any more. Last time I was at there web site they said they hadn't had a failure of rot or delamination in the product since it's inception. I've used the product and was very impressed with the quality. Other then color and some extra weight you can't tell any difference from regular plywood except for it's obvious better quality in streightness , surface, and lack of voids.Sincerely, Tom.
     
  4. August Ice
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    August Ice Junior Member

    Has anyone heard of Lauan marine plywood?? My supplier is having delays getting Okoume or Maranti.
     
  5. alan white
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    alan white Senior Member

    You could use fir or phillipine mahogany (lauan). Lauan is fine, so long as it's made with marine-rated glue.
     
  6. USCGRET/E8
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    USCGRET/E8 Senior Chief

  7. PAR
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    PAR Yacht Designer/Builder

    Mercanti, lauan and Philippine mahogany are all one and the same material (sort of). It's a conifer (evergreen) that happens to look somewhat like mahogany (some of it and to an untrained eye). You must be careful about these woods, as the quality, species type, construction methods and adhesives used must be questioned, from this part of the world. It's long been well known, that lumber and plywood coming out of the lower western rim countries can be dubious and possibly mis-representative of what you actual get. Stick with well known importers.
     
  8. August Ice
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    August Ice Junior Member

    Thank you Par... I persisted on the Maranti BS1080 and as it stands they can only get 1/2 " and 3/8" Maranti so we'll end up using 2 of the 1/2 and 1 3/8 to do the transom and 1/2 " for the decks and seats. The 3/4 " was luaun.

    Janet
     
  9. August Ice
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    August Ice Junior Member

    Thank you Alan for the Hamilton Marine connection.. We went there Monday... Great prices and selection.

    Janet
     
  10. alan white
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    alan white Senior Member

    Glad you found them. Did you end up getting the ply from that guy in Yarmouth? I've never dealt with him, but I'm sure I will one day soon.

    Alan
     
  11. August Ice
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    August Ice Junior Member

    I've only talked to Katie over the phone so far. I shared some information on Okoume and maranti plywood that I found on a website www.boatbuildercentral.com and specified that I wanted Maranti BS 1080. She was very informative regarding the 3/4 " being Luaun exterior ply She's always willing to go the extra mile to get the right stuff for her customers. My ply will be arriving Tuesday. That will be my first time there. The Maranti BS1088 is about $97 for 4x8x1/2" but the other Maranti was $ 48 same size. Okoume was $148 for the same stuff but their supplier was having a tough time getting it in stock.

    Janet
     
  12. PAR
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    PAR Yacht Designer/Builder

    A tip for your transom, to make it stronger without any extra fuss, is to cant the grain each way as the plywood goes in. This increases cross grain strength considerably (the manufactures do it too). Each piece of plywood has several veneers making up it's construction. This produces grain running side to side and also at 70 and 110 degrees, which increases the cross grain strength fantastically. In fact, the ideal way is to cant it as much as you can, in your case 22.5 degrees would be ideal, but you might run into difficulty with the sheet not being big enough to cover the whole transom in one shot.

    Draw up a semi scale picture of your transom and a same scale 4' x 8' sheet of plywood. The first one goes on long grain (8' dimension) straight across, from side to side, then see how much cant you can put into the next two sheets before you run out of plywood. Yep, it does produce a lot of weird shaped waste, but it is surprisingly strong.

    This sketch shows the two layers of plywood angled around 20 degrees, which in your case is three layers. Make the 3/8" layer the straight across one.

    [​IMG]
     
  13. August Ice
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    August Ice Junior Member

    Hello Par thank you for that tip.. I would've never known. It happens that there wouldn't be that much waste by looking at your diagram. We are also needing to replace the deck and seats in the bow, and under the dash. We could use some of the triangular pieces for the bow rider seats and compartment storage covers.

    Janet
     

  14. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    The arrangement shown above produces about 50% waste, which is considerable. I have many odd ball shapes stacked around here, hoping to find a use for them some day. It's not really waste, if it gets you back in the wet stuff, with a nice strong repair.
     
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