Creaky, wandering mast wedges

<< First  < Prev   1   2   Next >  Last >> 
  • 06 Sep 2024 08:38
    Reply # 13403261 on 13364524
    Anonymous member (Administrator)

    Fine-angle wedges, cylindrical partners

    The partners on my boats have mostly been made from metal, steel or aluminium, and they have been cylindrical with a rod welded to it along the upper edge. This means that the wedges get a little dented, but after gently hammering them down after a few trips, they stay put.
    On Ingeborg I made the wedges with very fine angles. The fine-adjustment of the mast rake (plumb) was actually done by shifting the mast step a bit back and forth. This let me make the partners with only 20mm clearance for the mast, and all wedges could be made next to identical.
    At the mast step, the fit is so good that I have only added a couple of thin wedges there. This may not be good enough for offshore work, though, but the mast has at least been secured from jumping out of the step...

    Arne


  • 06 Sep 2024 08:05
    Reply # 13403254 on 13364524

    Wedges will loosen if their angle is too great. It needs to be 1:50, or 1.2˚ as recommended in PJR, in order to self-hold. I have found it easier to get a mast out if I use a larger angle, and then put a disc of plywood above them, to hold them down, bolted or screwed down to the partners. I've done the same at the step, as well. It's possible to retrofit without taking the mast out, making four semicircular pieces by cutting two discs in half, and then gluing them together around the mast with the upper pair at right angles to the lower pair.  

  • 05 Sep 2024 23:25
    Reply # 13403143 on 13364524

    No, Paul, apparently conical partners are supposed to reduce wedge creep.  I confess, this was one of the attractions of a mast in a tabernacle - no leaks or creaks (although in fact the mast does still creak!).  On Fantail, I put a little PVA glue between the wedges as I drove them in and this seemed to work pretty well.  My wedges were very amateurish compared with yours, so this idea should work even better for you.  As far as I can tell, what happens is that one wedge works out and after that it all goes to pieces.  Gluing them together stops this from happening.  And you can put one of Arne's hose clamps onto a narrow strip of rubber, directly about the wedges to discourage them from trying to move up en masse.

  • 05 Sep 2024 12:01
    Reply # 13402784 on 13364524

    Paul So., I will report!

    Thomas, that might be true. I haven't thought about this, as my mast partner is super heavily laminated (ca. 5mm at the top, 8-10 mm at the transition between vertical and horizontal. I would think that this construction would be rather way too stiff, but I might be wrong.

    Somewhere in this forum I have read that conical partners always make for wandering wedges. I think it was Annie H. who wrote about this in a post, but my remembrance might be faulty. My partners are slightly conical, too.

    Last modified: 05 Sep 2024 22:49 | Anonymous member
  • 05 Sep 2024 07:28
    Reply # 13402744 on 13364524

    Paul, could it be possible that your mast collar isn't stiff enough, and a little flexibility here allows the wedges to move ?


    Last modified: 05 Sep 2024 07:36 | Anonymous member
  • 04 Sep 2024 20:48
    Reply # 13402527 on 13364524

    Oops - I meant to say I wanted to have the boat trucked from Southern California 1200 miles north to Seattle.  

  • 04 Sep 2024 20:19
    Reply # 13402515 on 13364524

    I have a Benford 34 with tapered metal unstayed masts, and partners that look similar to those on Paul Schnabel's vessel.  My masts were installed by a California boatyard - before I owned the boat - using Spartite, a two part epoxy-like substance that cures rock hard.  No creeping here!  However, the boatyard failed to use any release agent on the mast surface, and the boatyard that installed the masts gave up on removing them so I could have the boat trucked up to California.  I sailed her to Mexico instead.  I have a really good seal between mast and deck!  A boatbuilder friend told me that there is a release agent that the boatyard should have applied to the mast before pouring in the Spartite.  So, Paul Schnabel,  I would be very interested in what you use in lieu of wandering wedges and how well it works for you.


    Paul Sommers, Etoile du Sud

  • 04 Sep 2024 19:48
    Reply # 13402494 on 13364524
    Anonymous member (Administrator)

    It appears that you need 4 or 5 of those hoseclamps.

    Arne

    Last modified: 04 Sep 2024 21:01 | Anonymous member (Administrator)
  • 04 Sep 2024 19:25
    Reply # 13402488 on 13364524

    No, I haven't. It was still quite waxy.

    However, this last day of sailing really shifted the wedges considerably upwards again. I can tell from looking at the lower ends below deck. So, more wax would maybe reduce noise, but not movement of the wedges.



  • 04 Sep 2024 19:11
    Reply # 13402471 on 13364524
    Anonymous member (Administrator)

    Paul, 

    have you re-waxed the wedges after or before adjusting them?


    Arne

<< First  < Prev   1   2   Next >  Last >> 
       " ...there is nothing - absolutely nothing - half so much worth doing as simply messing about in junk-rigged boats" 
                                                               - the Chinese Water Rat

                                                              Site contents © the Junk Rig Association and/or individual authors

Powered by Wild Apricot Membership Software