Radar arch

Discussion in 'Boatbuilding' started by Rchild2412, Sep 7, 2020.

  1. Rchild2412
    Joined: Sep 2020
    Posts: 2
    Likes: 0, Points: 1
    Location: Baltimore, Maryland

    Rchild2412 New Member

    Hello all,
    We’ve Acquired a fiberglass arch
    Off of a 34’ Carver with a 14’ beam
    And we are attempting to install it on our 32’ Carver with a 12’ beam
    We’ve taken 25” off of the Original radar arch, to give us the width that we need, The problem that we have now is that, We don’t know the Proper way to rejoin the two together, also we would like to install a 4kw Raymarine radar unit ,
    Any help would be Greatly appreciated,
    Robert & Audrey
     

    Attached Files:

  2. Blueknarr
    Joined: Aug 2017
    Posts: 928
    Likes: 187, Points: 43
    Location: Colorado

    Blueknarr Senior Member

    Welcome to the club

    As there's always several ways to skin cats.
    My approach

    - attache a 1/2 inch thick aluminum backing plate to the inside top of one side of the arch with resin and screws
    - align arch and attach backer to other side with resin and screws
    - secure arch against any movement
    - grind an 8 to 1 bevel on underside of the arch
    - replace ground away FG with same type of cloth layering and resin as was originally used.
    - remove screws from the top
    - grind and reglass the top in the same manner as the bottom
    - fair and paint
    - drill and tap mounting holes for the radar
    - drill wiring passage and run a temporary fish line
    - install
     
    hoytedow likes this.
  3. Blueknarr
    Joined: Aug 2017
    Posts: 928
    Likes: 187, Points: 43
    Location: Colorado

    Blueknarr Senior Member

    After some additional thought I'm amending my approach.

    An overhead light would be welcome in most cockpits. Of you could find one which covers a hand hole.
    Replace aluminum plate with a thinner SS or T10 plate. Then cut an access hole in the bottom to allow securing the radar. Cover the hole with the light. Speakers would also disguise access holes.
     
    hoytedow likes this.
  4. kapnD
    Joined: Jan 2003
    Posts: 701
    Likes: 80, Points: 28, Legacy Rep: 40
    Location: hawaii, usa

    kapnD Senior Member

    I’d separate the two halves, and do the bulk of the repair laminating on the inside.
    As stated above, you’ll need to use some kind of jig to rigidly align the parts first.
     
    hoytedow likes this.
  5. Rchild2412
    Joined: Sep 2020
    Posts: 2
    Likes: 0, Points: 1
    Location: Baltimore, Maryland

    Rchild2412 New Member

    Hello Blueknarr,
    Thank you for responding,
    That’s what I’ll do this weekend, I have very little Experience doing this type of repairs, and I couldn’t find anything on YouTube, I’ll post pictures,
    Thanks a million
    Robert & Audrey
     
  6. Blueknarr
    Joined: Aug 2017
    Posts: 928
    Likes: 187, Points: 43
    Location: Colorado

    Blueknarr Senior Member

    Get the lights or speakers first.
    Verify that they will cover a large enough access hole.
    Use the removed section for testing.

    Good luck
     

  7. wet feet
    Joined: Nov 2004
    Posts: 499
    Likes: 42, Points: 28, Legacy Rep: 124
    Location: East Anglia,England

    wet feet Senior Member

    You have two significant challenges;first joining the two pieces without a ridge appearing in the centre of the arch and then making sure the mounting surfaces of the arch will fit the boat they are intended to be attached to.The structural aspect of the revision to the arch has already been described.
     
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