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Broken Bow Tang and repair  Bottom

  • MN3
    MN3
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    Link to this post Posted: Jul 25, 2016 - 12:49 PM
    I broke a bow tang off the bow on my 95 mystere

    I broke a side stay tang off 6 years ago or so.. I knew it was a matter of time before the bow tang went (http://www.thebeachcats.c…nc=viewtopic&topic=11540)



    I had bow tangs fabricated a few years back when a friend had a broken bow tang on his mystere

    I figured I would document it here to help anyone out in the future

    I have created an album to host the images - http://www.thebeachcats.c…ictures?g2_itemId=123629

    Tang broke while on the water
    Rig did not fall (was held up by spin bridal)
    I went out to the bow and tied off the furler to a line I wrapped around the bow


    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123641&g2_serialNumber=6


    Broken Tang (and one from the other bow) - http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123657&g2_serialNumber=3

    So with the help of a friend, chisel, putty knife and crow bar .... off come the decks
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123659&g2_serialNumber=6

    Yesterday I sanded down the decklids to level off the old glue (and started sanding on the bows to level them off too) and while I had the lids off, I epoxied the bulkheads to the walls (they had some glass on them attaching them, but not a lot)

    More to come ...



    Edited by MN3 on Jul 25, 2016 - 12:54 PM.
  • Wolfman
    Wolfman
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    Link to this post Posted: Jul 25, 2016 - 09:28 PM
    Thanks Andrew! This is going to be super helpful when inevitably one of mine fails. I've been looking for good photo documentation of the repair and haven't found it yet.

    --
    Dave Bonin
    1981 Nacra 5.2 "Lucile"
    1986 Nacra 5.7 "Belle"
    Winnipeg, Manitoba, Canada
    --
  • MN3
    MN3
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    Link to this post Posted: Jul 26, 2016 - 08:45 AM
    Glad to help out ~
    this really is not that hard of a job, but putting a chisel to your boat and small sledge to knock out the tang is painful.

    I'm gonna add a few lb of epoxy to my boat (bulkheads) but I should have a stiffer boat when done

    SideNote: the bulkheads directly under the beam they have a few "lightning bolts" running through them (are cracked) - I will be adding some new glass/epoxy to reinforce them
  • MN3
    MN3
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    Link to this post Posted: Jul 27, 2016 - 09:17 AM
    While i have the decks off....
    I am going to add some epoxy to the bulkheads
    used west system epoxy and microfibers to create a paste that I used
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123713&g2_serialNumber=4


    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123712&g2_serialNumber=4
  • MN3
    MN3
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    Link to this post Posted: Jul 27, 2016 - 09:22 AM
    Last night I took some pics from behind the bulkhead that is directly under the beam

    we had to cut holes into this bulkhead 6 years ago to gain access to the side stays.
    at that time (under advisement) I used some epoxy and "sealed" the lip of the cut so water could not get in.
    It seems I should have replaced the cut out or glassed over it as it has now developed "lightning bolt" style cracks that are all coming from(or going to) the area we cut out.

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123692&g2_serialNumber=3

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123696&g2_serialNumber=3


    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123697&g2_serialNumber=3<br />

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123690&g2_serialNumber=3

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=123694&g2_serialNumber=3
  • MN3
    MN3
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    Link to this post Posted: Aug 02, 2016 - 12:40 PM
    went to store - purchase 4' x 8' foamboard was $75 but i showed him the messed up corner - he said he could replace it, I asked for a discount instead. He gave me 30% off. - Fiberglass Coatings, Inc. St Pete Rocks!

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124143&g2_serialNumber=4

    made templates then cut foam
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124123&g2_serialNumber=4

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124126&g2_serialNumber=4

    epoxy sides and tops
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124129&g2_serialNumber=4

    back side and added a spline for added strenght
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124132&g2_serialNumber=4

    While i had access, i added marine grade silicone from underneath both hull ports
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124135&g2_serialNumber=4



    Edited by MN3 on Aug 02, 2016 - 12:47 PM.
  • dmgbear55
    dmgbear55
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    Link to this post Posted: Aug 02, 2016 - 06:17 PM
    I appreciate the detail you are showing on this repair. Every time someone takes on on of these repairs and shows others how it is done it brings the value of all these boats up. These are not overwhelming repairs when you understand the steps and the materials. These boats are not "shot" when they are slightly damaged. Doing the repairs correctly simply extends the boats life substantially.

    It is also interesting that you got to this repair when you did. Things were definitely starting to happen that would have made for a very bad day on the water.

    dg

    --
    dg
    NACRA 5.2 #400
    This End Up
    Original owner since 1975
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  • MN3
    MN3
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    Link to this post Posted: Aug 03, 2016 - 11:00 AM
    QuoteI appreciate the detail you are showing on this repair.......It is also interesting that you got to this repair when you did. Things were definitely starting to happen that would have made for a very bad day on the water.


    Glad to help other cat sailors -

    This was an expected event, I had the replacement parts fabricated years ago and will sail with much more confidence in my vessel after this.

    I am glad i found out the bulk heads were so blown out - i should have kept a better eye on them (they have ports close) - the forces trying to rip apart these bulkheads is immense.
  • MN3
    MN3
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    Link to this post Posted: Aug 03, 2016 - 11:05 AM
    Today i cut open the lat bulkhead that we installed many years ago when i put in a big hatch so i could glass up the entire cracked bulkhead top to bottom

    I just realized it is wood and not foam, so it's coming out and will be replaced with much lighter foam cored epoxy

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124148&g2_serialNumber=6

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124151&g2_serialNumber=6



    Edited by MN3 on Aug 03, 2016 - 11:20 AM.
  • MN3
    MN3
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    Link to this post Posted: Aug 04, 2016 - 11:04 AM
    old lat bulkhead was made of wood and had to go
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124193&g2_serialNumber=6

    checking out the glass i laid up behind the existing bulkhead
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124196&g2_serialNumber=4

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124199&g2_serialNumber=4
    looks good to me
  • MN3
    MN3
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    Link to this post Posted: Aug 04, 2016 - 04:48 PM
    heavy glass added to front of cracked bulkhead
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124205&g2_serialNumber=6

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124214&g2_serialNumber=11

    after it started to get thick i used wax paper to smoosh it into every nook and cranny

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124215&g2_serialNumber=11
  • MN3
    MN3
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    Link to this post Posted: Aug 18, 2016 - 10:58 AM
    epoxied in new bow tangs
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124464&g2_serialNumber=6

    Bulkhead glass all cured
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124449&g2_serialNumber=6

    Added tape to top of decks - added glass to the lip (for a nice clean area to epoxy back on
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124452&g2_serialNumber=4

    2 tubes of West System six10 per side
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124458&g2_serialNumber=6

    used straps to squeeze deck to boat - used weights on the bow tips
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124461&g2_serialNumber=6

    nice shot of the six10 oooozing out of the deck lid and deck
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124467&g2_serialNumber=6
  • MN3
    MN3
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    Link to this post Posted: Aug 31, 2016 - 02:45 PM
    many layers of thickend and pigmented gelcoat - last coat had wax additive

    Then 10 sheets of 80grit with an inline-sander
    5 sheets of 220
    20 sheets of various grit for a powered mouse detail-sander
    a few sheets of 320, 400 and 600 for a hand block sander



    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124644&g2_serialNumber=4

    Site is importing these 90" off and currently wont let me adjust
    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124626

    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124636&g2_serialNumber=4


    http://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=124651&g2_serialNumber=4
  • MN3
    MN3
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    Link to this post Posted: Aug 31, 2016 - 02:53 PM
    That's it - stick a fork in me

    there are some small imperfections in the new gel-coat that i could spend another week on to get it Show-Room-Perfect but since no other area of this boat is close .... i'm basically done

    I'm going sailing on it this weekend (as soon as this Tropical Storm Hermine gets out of here - there is a local race on sunday too)



    Edited by MN3 on Aug 31, 2016 - 03:12 PM.

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