How Many Layers of 1700 for 1/4"

Discussion in 'Boat Design' started by Brian Gentile, Mar 11, 2020.

  1. Brian Gentile
    Joined: Jan 2019
    Posts: 7
    Likes: 0, Points: 1
    Location: Chicago, IL

    Brian Gentile Junior Member

    Deciding on using 1708 vs 1700 and need to build to a total of 1/4"

    How many layers does it take to get to 1/4" using 1700.

    1708 looks like its 6 layers.
     
  2. TANSL
    Joined: Sep 2011
    Posts: 5,899
    Likes: 233, Points: 73, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    In the 1/4 " thickness, is the resin included or do you only count dry fiber?
     
  3. wet feet
    Joined: Nov 2004
    Posts: 477
    Likes: 39, Points: 28, Legacy Rep: 124
    Location: East Anglia,England

    wet feet Senior Member

    Will there be vacuum consolidation?
     
  4. Brian Gentile
    Joined: Jan 2019
    Posts: 7
    Likes: 0, Points: 1
    Location: Chicago, IL

    Brian Gentile Junior Member

    I am looking for how many layers will it take using west system and 1700 wetted out and hit with a fin roller to get to 1/4"
     
  5. bajansailor
    Joined: Oct 2007
    Posts: 633
    Likes: 151, Points: 43, Legacy Rep: 37
    Location: Barbados

    bajansailor Marine Surveyor

    Do you have your material already?
    If yes, then maybe make up a couple of test samples using the two different kinds of mat - they could be just 3" or 4" square.
    Build up the layers and see how many it takes when you are rolling out with a fin roller.
     
  6. Brian Gentile
    Joined: Jan 2019
    Posts: 7
    Likes: 0, Points: 1
    Location: Chicago, IL

    Brian Gentile Junior Member

    I dont have any 1700 just 1708.
     
  7. gonzo
    Joined: Aug 2002
    Posts: 13,936
    Likes: 481, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Do you have 1700 or 1708? If you have 1708 and are using 1708 it shouldn't be a problem to make a test coupon.
     
  8. Brian Gentile
    Joined: Jan 2019
    Posts: 7
    Likes: 0, Points: 1
    Location: Chicago, IL

    Brian Gentile Junior Member

    I have 1708 and tested that already and 6 layers get me to 1/4". I do not have 1700 so not sure how many layers to get to 1/4"
     
  9. gonzo
    Joined: Aug 2002
    Posts: 13,936
    Likes: 481, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    What type or resin are you using?
     
  10. fallguy
    Joined: Dec 2016
    Posts: 2,602
    Likes: 221, Points: 63, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    Hand laminated 1708 runs around 0.040" per layer, vac about 0.035".

    Vac bagged 1700 is about 0.023, hand laid about 0.028.

    I run the vac high, not sure if that would make a difference.

    But do keep in mind the strength comparisons are not equal. 1700 for the same thickness is stronger and even more so if you can turn the bias, although that is true for both..
     
    Last edited: Mar 11, 2020
  11. Brian Gentile
    Joined: Jan 2019
    Posts: 7
    Likes: 0, Points: 1
    Location: Chicago, IL

    Brian Gentile Junior Member

    West System
     
  12. ondarvr
    Joined: Dec 2005
    Posts: 2,111
    Likes: 191, Points: 63, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    What is the reason for 1/4”?

    If strength has nothing to do with it, 1708 will get you there. The laminate will be resin rich and have less strength than the same thickness of 1700 though.

    1700 will give you a lighter and less costly laminate for the equivalent strength of a 1708 laminate.
     
    bajansailor and fallguy like this.

  13. gonzo
    Joined: Aug 2002
    Posts: 13,936
    Likes: 481, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    1708 fabric is 0.044" thick. 6 layers make 0.264" thick which is more than 1/4" (0.25"). That is a dry stack. Each layer will be thicker when wetted.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.