FG and wood question

Discussion in 'Fiberglass and Composite Boat Building' started by Rich M, Jun 8, 2009.

  1. Rich M
    Joined: Jan 2004
    Posts: 29
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Florida

    Rich M Junior Member

    I haven't been around for a while - however, just built another small FG & plywood boat. This one is 10 ft long, 44 inches wide, and weighs about 80#.

    I used 1/4 inch plywood and then 7-1/2 oz E cloth inside and out. The inside and outside seams were taped twice with 3 inch tape. Mid-grade polyester resin.

    [​IMG]
    [​IMG]


    I had 2 questions - would I gain much strength by using 8 or 9 oz satin weave cloth over the 7-1/2 oz "regular weave" on the outside of the hull?

    The second question pertains to applying the FG tape before or after the FG cloth - is it just as strong either way? Or is it better one way or the other?
     
  2. rasorinc
    Joined: Nov 2007
    Posts: 1,854
    Likes: 71, Points: 48, Legacy Rep: 896
    Location: OREGON

    rasorinc Senior Member

    Most builders use tape 1st then full glass over that after feathering. One layer of glass is for waterproofing only and scratch resistence. You get a little cohesion from it but not true strength. The wood provides the strength.
     
  3. rwatson
    Joined: Aug 2007
    Posts: 5,873
    Likes: 311, Points: 83, Legacy Rep: 1749
    Location: Tasmania,Australia

    rwatson Senior Member

    What makes you think you need to re-inforce?
     

  4. Rich M
    Joined: Jan 2004
    Posts: 29
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Florida

    Rich M Junior Member

    Its one of those "always try to do better" things.

    I designed the boat over several years of building similar boats (8 ft boats) - always trying new twists and such. The boat worked out very well in its test run.

    http://www.youtube.com/watch?v=blumcB0x2Is

    I'd like to build another one that is about 10-15# lighter than this one by using lighter transom and bulkhead wood - and lighter flotation foam - and doing something else for a motor mount instead of 2 big pieces of 3/4 inch ply.

    So, I'd just like to improve on the last one.

    If I can gain any significant strength in slightly heavier FG, I would like to.

    OR if I would be better off using S cloth and or epoxy resin.

    I'm looking at my last boat build for a while due to finances and a possible move in the near future.
     
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