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  1. #1

    Question regarding broken Chinook mast foot

    Good morning everyone,


    Aftr a fantastic wave sailing session last Sunday I had an experience which was not nice. I got caught on a wooden jetty, my rig was on the windwards side, my board on the leewards side of the jetty. Finally, my mast broke and after that the pins of my mast foot (part 3 on the figure/link below) were bent so much that the mast foot came off the extension (which was good, because then I was able to save my board). Everything else in the mast foot seems ok. Do you think I can just replace the pins? I was not able the open the screw (part 4) and check it because I couldnt reach it (what tool would I need to open this screw?). Or should I better replace the entire mast foot?


    Regards,
    Philipp


    https://chinooksailing.com/collectio...s/base-cup-kit

    Click image for larger version. 

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  2. #2
    Senior Member Jeroensurf's Avatar
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    You can take them fully apart and put them back together with a couple of socket spanners and a tapped wrench.



    When putting it back together do,n,t forget the locktite!!!
    188x92kg 43y old, Supper/Windsurfer.

    Witchcraft Flextail 104l + Witchcraft V4 86l HDD

    2016/17 Hotsails KS3: 5.5+5.2+4.9+4.6+4.0+3.4 Ultra + Kauli + CAAS masts, AL360+ TL cont@ct booms lots of fins.

    SUP Starboard 2015 Airborne 8.8x31.5x123l / Pro8.5x29x112l / Race14x25 / 2012 AST Coastrunner 14x28 / Gong9.4x29x135 Freak

  3. #3
    Senior Member
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    If the pins were put under that much pressure that they bent I would suspect the holes through which they normally fit are also damaged/enlarged. Personally I would not trust it after that sort of trauma!

  4. #4
    That's the US cup system.

    Most people have given up on that system and now use the Euro-pin system instead.


    The main issue with the US cup is usually that the nipples on the spring clip cause problems part 3, as you describe.

    So, take this as an opportunity to get something better. Chinook deck plates and euro-pin system extensions are fine.
    Now back in the UK.

  5. #5
    Senior Member PK1111's Avatar
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    Given the low cost of the components and their criticality, I’d just replace the entire set.

  6. #6
    Senior Member Jeroensurf's Avatar
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    I changed to Euro pin last year after decades of US and i,m not convinced that Euro is better.
    One of the things I really liked about US is that it doesnt get stuck due sand and you simply can store the excess rope in the extension.
    188x92kg 43y old, Supper/Windsurfer.

    Witchcraft Flextail 104l + Witchcraft V4 86l HDD

    2016/17 Hotsails KS3: 5.5+5.2+4.9+4.6+4.0+3.4 Ultra + Kauli + CAAS masts, AL360+ TL cont@ct booms lots of fins.

    SUP Starboard 2015 Airborne 8.8x31.5x123l / Pro8.5x29x112l / Race14x25 / 2012 AST Coastrunner 14x28 / Gong9.4x29x135 Freak

  7. #7
    Senior Member
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    I would replace. Must have been a lot force through the system to break it. Both systems work fine. If you have just one then i'd change as Euro system is much more widely used however it's not a big issue.

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