Mast partners and Coach Sides

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  • 27 Aug 2020 04:08
    Reply # 9193041 on 4208358
    Anonymous

    Thanks David! 


    All makes sense to me.

    So my plan as of now is to install the main bulkhead, which already has a beam on ether side of it. This beam runs across the entirety of the caben, from port to starboard. (Originally was the main suport for the Bermuda rig). forward of that, I will glass in the forward bulk head.

    This head will take the shape that David has recommend. The only difference is that it will be taken down to the floor of the caben floor. It was originally 1/2 in ply but I will laminate that with 3/4 ply on ether side. The 3/4 ply will come  to the Midway point of the hull. (As pictured in the example).

    In between the two bulk heads is where the head and a hanging closet are. These will be reinstated with 1/2 in ply forming the "doorways". The doreways are about a foot and a half from the center of the mast partners. The combination of the two bulkheads (forward and aft), and the doorways (port and starboard), form a rectangle on the caben ceiling. This rectangle will be reinforced with three pieces of laminated 1/4 in ply. 


    Above deck, three more pieces of 1/4 in ply will be mounted.this will be the same shape as the rectangle on the ceiling of the caben. The post to receive mast shims will be above that, "Four pieces of 3/4 in ply rings". These will be bolted through; the three pieces of 1/4 in ply above deck, the deck itself, the three pieces of 1/4 in ply below deck.

    It should all be less work than it is writing it down. I just wanted to say it out loud on the internet so I can start the process with some peace of mind.

    Thanks to anyone who understands.  Hahahaha 

    Hotdog

  • 26 Aug 2020 08:02
    Reply # 9190842 on 4208358

    Jeffrey,

    There's no headliner in my forepeak, just foamed vinyl stuck onto the topsides, which I had to cut away, and gelcoat sprayed onto the underside of the deck. In both cases, I had to grind back to clean glass laminate. If there had been a headlining, I would have needed to cut it away, as they don't generally have much strength or attachment to the deck. I used epoxy resin and colloidal silica for the filleted bond.

    Last modified: 26 Aug 2020 08:03 | Anonymous member
  • 25 Aug 2020 21:28
    Reply # 9189996 on 4208358
    Anonymous

    A David.

    That is a very helpful picture. I'm thinking of incorporating that consepet onto my bulk  heads witch sit about a foot for and aft of the mast. I don't know it that is a head liner in the image you posted? I have a liner in my boat And was wondering if you would recommend removing it or just callk over that part? Also what is the stuff you used in that picture to adhear to the coach roof 

  • 12 Sep 2016 16:20
    Reply # 4245749 on 4208358
    Deleted user

    Well, I'll supplement the prayer with the all powerful fetal-position-weeping-like-child thing.  That usually does the trick.

  • 06 Sep 2016 22:10
    Reply # 4231319 on 4230759
    Scott Dufour wrote:

    On my first dark and stormy night, I'll look at those mast partners and whisper, "David said it's okay.   David said it's okay"

    The Great One has spoken - so no worries!
  • 06 Sep 2016 17:40
    Reply # 4230759 on 4208358
    Deleted user

    That's great feedback and simplifies things significantly.

    On my first dark and stormy night, I'll look at those mast partners and whisper, "David said it's okay.   David said it's okay"

     

     

  • 01 Sep 2016 17:00
    Reply # 4222205 on 4208358

    I see less need for additions here. Some boats with unstayed masts seem to creak a bit under rolling conditions, indicating a lack of rigidity athwartships, but fore and aft they are naturally stiffer. I agree that the mast sees considerable loadings when running in a confused sea, but the hull and deck themselves seem able to cope. So many GRP boats have now had unstayed masts added with just local reinforcement of the deck in way of the mast that there seems little need to worry unduly. OK, we all have memories of the "dark and stormy nights" we've been through, when we've wanted the integrity of the boat to be completely beyond doubt; but in this case, I think extra reinforcing is just to enable us to sleep sounder o' nights. Not a bad thing, at that.

  • 01 Sep 2016 16:24
    Reply # 4222150 on 4208358
    Deleted user

    Next question, then:  Fore and Aft support.

    Is the shock loading on the mast and partners is higher fore and aft than athwartship?   I'm thinking about hitting a big wake while running at 6 knots.

    If so, do I need to beef up the forward coach side to deck turn, too? 

  • 25 Aug 2016 19:06
    Reply # 4210696 on 4208358
    Deleted user

    That make complete sense.  Thank you, David.   

  • 25 Aug 2016 17:27
    Reply # 4210469 on 4208358

    I meant that the laminated beam takes the place of four hanging (vertical) knees that would otherwise have stiffened the coachroof top to coachroof sides corners and the side deck to hull joints. I don't really see a need for lodging (horizontal) knees.

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