J/111 Mast Track Update

Here’s a short update on our mast.

Yesterday I visited Aston Harald Composite to discuss the repair. Feels good with professional people on the job.

It was during a sail test with Henrik Ottosson from North Sails, that we found that the track had come loose, just below the second spreader. We naturally aborted, and took the mast down to figure out what had happened.

The aluminum track, glued with Plexus MA425, had come clean of with all the glue still on the mast. There are rivets holding the track every 2 meters, and those had stopped the damage from spreading.

Removing the rivets, we were able to remove about 5 meters of the track more before the glue was fine and well attached to the track. Initially, we thought that the track wasn’t properly cleaned or primed, but now we see that the glue isn’t homogenous in color. So we suspect it hasn’t been properly mixed from the start, as can happen when you change tubes mid-job.

There’s no major load point here, and we haven’t used the second reef since 2016 (Göteborg Open Sea Race). We suspect that the root cause could be a heavy air gybe or flogging the main during a broach in this years Tjörn Runt. That could produce a whiplash effect on one of the sliders.

I know that glued mast tracks can be an issue on bigger boats, but I never heard it happen on a 36′ light displacement boat?

Sure, we race hard. But not that hard?

Batt, Jens & Francois discussing alternatives.

The plan now is to reglue the part that’s loose, double up on the rivets and put some additional ones at the reefing points. Should be stronger than ever.

12 Comments

  1. Micke Holmström Nov 15, 2018 Reply

    Förefaller ju vara en miss i tillverkningen, har du bett om J/Boats kommentar?

  2. Anders B Nov 15, 2018 Reply

    Det räcker med en patron limför att limma hela rännan, men blandningen kanske inte fungerat som den ska (med tryckluftsdrivet blandningsmunstycke). Man får trycka ut lim tills färgen är OK. Jag har limmat med samma Plexuslim, det håller! Första försöken epoxi enligt CST´s instruktioner funka inte. Numera anger dom Plexus.

    • Author
      Peter Gustafsson Nov 15, 2018 Reply

      Vad är din gissning när man rengjort skenan på baksidan. Slipa till den lite eller behålla så mycket anodisering som det går (förstår att primern reagerar med anodiseringen)?

      Inte min sak längre, men man är ju lite nyfiken.

  3. Patrik Ström Nov 16, 2018 Reply

    Är det någon som vet var man kan köpa Plexus MA425 i Sverige. Jag googlade men det kom bara upp engelska sidor och Lexus.se, men det är ju något helt annat…

    Högt & fort /// Patrik

    • Author
      Peter Gustafsson Nov 16, 2018 Reply

      Jag kunde inte hitta något och distributören hade lång leveranstid. Bästa tipset är nog masttillverkarna (jag köpte mitt från Hall Spars i Holland).

  4. Thomas Wiberg Nov 16, 2018 Reply

    Generalagent för Plexus limmer i Sverige är Gleitmo AB i Kungsbacka, telefon 0300-333 33.

    Väldigt bra företag att ha att göra med. Beroende av deras produktsortiment naturligtvis inte i första hand inriktade på att sälja till konsument, men positiva och korrekta i sitt kundbemötande.

    • Patrik Ström Nov 16, 2018 Reply

      Kanon. Tack för det.
      Högt & fort /// Patrik

      PS . som lyfte upp “Medströms” på land idag

  5. ErikB Nov 17, 2018 Reply

    Hur kommer det sig att du inte reparerar den hos Seldén? Det är ju en av deras produkter.. Vad är deras kommentar och analys till varför skenan släppt?

  6. SV Kraken Apr 25, 2019 Reply

    Hi, Thanks for the article. My 15.2m high latitude cruising boat i used plexus 425 with primer pc120 to glue the harken ball bearing track onto my carbon fibre 23 metre mast. I used 5mm counter sunk screws at the joins and head board. When i bonded the track down after extremely careful preparation I put 1.2mm fishing line packer every .5 metres(only a few mm under the track on each side. Plexus will not cure properly if to thin! it needs a thick glue line to use its high elongation to spread the peak loads into the bond line. We have sailed the southern ocean ,cape horn, Antarctica ,crash jibed dodging whales, maximum wind speeds of 65 knots my NKE wind instrument blew away (2nd time!) It still seems ok. But its only been 4 years 26000 miles. If i did it again i would use some more screws and make sure they are flush on the inside of the mast. Sail track problems are dangerous problem offshore. I think rivet ends may damage my hi tech halyards inside the mast. I worked for one of the worlds largest carbon mast manufactures in the world, doing R and D. This my own boat my own thoughts.

  7. Dennis Apr 29, 2019 Reply

    Jag håller på att limma en Antal skena på en kolfiber mast. Antal rekommenderar Spabond 345 lim. Vad användes det Peter på din reparation?

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