[Public-List] Bulkhead through companionway?

[Mike Lehman]

Andrew,
 
This repair has been done to a number of liner boats. The bulkhead rests on the liner and there is nothing underneath to connect the liner to the hull, so over time and compresssion, the line starts to 'dimple' around the doorway to the forward cabin. If you pull up the floorboard in the forward cabin and look aft, you will see the bulkhead is just resting on a 1/4" or so piece of liner. The good news is that once the compression reaches a certain point (about 3/8") it never goes any further. Whitby added more suppor under this forward set in later boats.Mike Lehman ~~~_/)_/)~~_/)~~~> To: public-list at lists.alberg30.org> Date: Wed, 12 Mar 2008 09:06:02 -0400> From: andymshaw at juno.com> Subject: Re: [Public-List] Bulkhead through companionway?> > Hi Rachel,> > Thanks for your input. Reading your notes made me realize I slightly> mispoke. I work on wooden boats so that tends to slip into my> terminology. To truly transfer load to the "keel" on an Alberg you would> actually have to move the companionway to starboard so the compression> post would be on centerline (which I believe at least one person has> done). I plan to glue/bolt in as broad a piece of timber (a step as it> were)as will fit below the post to spread the load around as much as> possible on that area.> > Hope this is a little clearer.> > Andy~> > > On Tue, 11 Mar 2008 22:13:33 -0400 Rachel <penokee at cheqnet.net> writes:> > > > On Mar 11, 2008, at 9:18 PM, Andrew M Shaw wrote:> > > > > At the forward end is a 3/4" ply floor timber but> > > nothing directly under where the bulkhead rests except the balsa > > cored> > > step. So I'm not surprised it had caved in. I will correct this in > > the> > > repair process and transfer the load to the keel.> > > > I'm not speaking directly to your boat here, as I'm not very > > familiar > > with the liner boats. But I've wondered about where it's best to > > transfer loads in a fiberglass boat with integral ballast. It seems > > > > like it might be best NOT to transfer loads to the ballast pig (at > > least not many of them), because really, it's just a chunk of iron > > sitting inside one bit of the hull's fiberglass (whereas on, say, a > > > > wooden boat, there are significant structural members down there, > > such > > as the keelson).> > > > Since a fiberglass boat is typically more of a "unibody" type > > structure, maybe it makes more sense to spread the load out with > > tabbing to the sides of the hull, etc.? Of course that's not to say > > > > you can't have any load on the keel, but I do wonder how best to > > spread > > out the load, if one has "the opportunity" to redo the bulkheads and > > > > some of the surrounding structure (vs. purposely trying to transfer > > the > > load to the ballast with a compression post).> > > > Physicists and boat designers feel free to pipe in! :)> > > > Rachel> > > > _______________________________________________> > These businesses support your Association:> > http://www.alberg30.org/store/A30supporters.html> > Please support them.> > _______________________________________________> > Public-List mailing list> > Public-List at lists.alberg30.org> > http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org> > > > > > > > "There is more to sailing than ropes and winches, cleats and bulging> sails.> There are faraway places and the ever changing light, and the silence,> and a> great peace at the bottom of your soul." - Ferenc Mati> _______________________________________________> These businesses support your Association:> http://www.alberg30.org/store/A30supporters.html> Please support them.> _______________________________________________> Public-List mailing list> Public-List at lists.alberg30.org> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
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