fiberglass radar arch

Discussion in 'Projects & Proposals' started by mjkkemper, Mar 26, 2011.

  1. mjkkemper
    Joined: Nov 2010
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    mjkkemper Junior Member

    just wondering if anyone has built a fiberglass radar arch? If so any pic's
     
  2. rasorinc
    Joined: Nov 2007
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    rasorinc Senior Member

    Here is a pic of one I'm ging to replicate. It is out of wood but a nice design.
    Did not come thru will try again. http://www.glen-l.com/ go to customer photos. Click on Bear Cat by Andy Smith boatworks.
     
  3. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    Do you mean something like this?
     

    Attached Files:

  4. mjkkemper
    Joined: Nov 2010
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    mjkkemper Junior Member

    yes


    i wanted to see how other people made their plugs or how they did their layup
     
  5. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    There never was a plug.

    I made the mold from heavy impregnated plywood, lots of plaster and some silicone. Because I knew that the mold would not survive the operation I paid little attention to prepare the surface: just a single coat of PVA. After the gel coat and three glass layers I embedded stainless tubes in the edges and some pieces of wood to support the upholstery, followed by one last glass layer.

    The shape is such that the mold has to be broken over the whole length of one edge to release the object.
     
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  6. Pat Ross
    Joined: Jul 2006
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    Location: Florida

    Pat Ross Corinthian 41 Tri #12

    arch for traveler & main sheet

    How do you insure the strength to mount a traveler and main sheet?
     
  7. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    That's a totally different thing. You will have to start by calculating the structure on the deck where the arch will be mounted to.
     
  8. mjkkemper
    Joined: Nov 2010
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    mjkkemper Junior Member

    For a Radar arch I was planning on installing the radar on it
     
  9. mjkkemper
    Joined: Nov 2010
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    mjkkemper Junior Member

    Ended up making one and installed it today.
    [​IMG]
    [​IMG]
    [​IMG]
     
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  10. iceboater
    Joined: Jan 2011
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    iceboater Junior Member

    Thanks for sharing. Could you share with us how you made yours, plug, layup, material?

    Axel
     
  11. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    Congratulations mjkkemper, that's looking good.

    Probably you'll need to modify the way it is attached to the flybridge, with two contact surfaces instead of one on each side. You won't like the way it swings back and forth on a rough sea.
     
  12. mjkkemper
    Joined: Nov 2010
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    Location: mi

    mjkkemper Junior Member

    When the aft hard top is added it will avoid this
    [​IMG]

    Below is the plug
    [​IMG]

    Lay up - veil, chop mat and 3 layer of 1708 bi-axle
    [​IMG]

    Wire chase and closing up the inside
    [​IMG]

    De-miles and 3# urathan closed cell added in the chase
    [​IMG]

    Flaring out the inside
    [​IMG]

    Touch up
    [​IMG]
     
  13. tunnels

    tunnels Previous Member

    All archs have 4 weak points !the two top 90 degree corners and the two mounts where they are fixed down . Depending on what gets loaded on top and how much weight is there will determin the amout of movement and the forces involved so just be aware !! One line of production boats always had trouble in those 4 places till they changed the design signifcantly . :p
     
  14. mjkkemper
    Joined: Nov 2010
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    Location: mi

    mjkkemper Junior Member

    Very interesting and makes good sense. Below is how it's tied inside. 45 degree for lateral support.
    [​IMG]

    The hard top will be about half way up the arch and I would think it would help with the two top 90 degree. Splashing tue so we will see.

    Interesting on the new designs. What did they change or improve?
     

  15. tunnels

    tunnels Previous Member

    The upper 90 was broken into 45 and bigger and thicker inside was a pre moulded very stiff glass moulding all on edge completely round the corner , part way along the top and part way down the sides . The bottom one side became a part of a seat back and so tied the whole thing much better !! always vibration but nothing lke it had been !
     
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