Showing posts with label CB case. Show all posts
Showing posts with label CB case. Show all posts

Tuesday, October 2, 2018

Nails and glue


Here you can see the forward part of the keel with integral stem and garboard cleats. I cut off part of the forward end of the cleats because the bevel angles get complicated; I will bevel and add this part later. You can see the great outdoors just beyond: the construction is taking place on our terrace under a roof overhang. The remnants of the Mediterranean hurricane have just blown by, with no ill effects on our island or the boat construction, despite several days of strong winds and rain.

The second photo shows the centerboard trunk walls. On the left is the outside, with garboard cleat and cleats for two bulkheads. The bulkheads will be topped with the rowing thwart, and the space filled with expanded polystyrene for buoyancy. On the right is the inside, with spacers. If you look closely you will see a space carved out for the sheave of the centerboard lifting mechanism. Once the two parts have two coats of epoxy on the inside they will be glued and nailed together and then attached the same way to the forward and aft keel pieces.

The last photo has the aft keel/skeg pieces (with garboard cleats) glued and nailed together. Note the part above the cleats in the rear: it will anchor the transom vertically and the aft bench horizontally, but will not be visible inside the buoyancy compartment.
 
If all goes well the entire centerline backbone of the boat will be nailed together tomorrow.






Saturday, May 14, 2011

Starting assembly

 Well, assembly has started (finally).  This is the bow, laminated from two layers of 9mm (3/8 inch) plywood, and the two fore bulkheads.  They are nailed and glued (with some temporary screws) to a horizontal beam that will have the mainmast hole forward of the first bulkhead.  There is also a temporary brace to hold the two bulkheads together until the keelson and inwales go on.  You can see that each bulkhead has a cedar doubler for strength and for nailing the foredeck on (much later, when the hull is built and the boat is flipped right-side-up).  The tops of the bulkheads will be rounded before that, but for now it's convenient to have straight tops to keep everything square and level, especially since the centerline of the fore-end beam is designed to be exactly horizontal.  You can also see the square opening in the main bulkhead, which will have a sliding panel for access to a large locker. The bow is angular for now, but will be rounded after the hull is built, with the addition of oak pieces.

The fore-end assembly sits on the pallet that the plywood arrived in (see Pallets and Cowboys).  Unfortunately it is a little warped and I had to make adjustments.  This pallet is a convenient size for plywood cuts and minor assembly, but the fact that I have to use it is testament to my lack of space.  I also lack tabletop space (hard to fit a table of any kind amid the gardening supplies and equipment), so the tools are all over the place and I have to tidy up periodically. 

On the right you can see all the components of the centerboard (CB) case, ready to assemble (after a second coat of epoxy on the inside).  On top is the starboard panel seen from the outside.  You can see a cleat on the top edge for strength and to glue a plywood strip (with a slot for the CB).  The bottom doubler will attach to the hull--you  can see how it was curved to fit the curvature of the boat's bottom. It will be below the floorboards.  Of course these doublers and the panels themselves had to be cut to different sizes and glued at different heights to fit around the keelson and account for the v-shape of the boat's bottom.  Once again, thank heavens for trigonometry.

Below you see the inside of the port panel of the CB case, with 7/8-inch thick oak spacers to accommodate a 3/4-inch CB.  You can also see a mock CB for fitting purposes, cut out of corrugated cardboard (it held my wife's new laptop computer).  The extra-long spacer on the left will provide support for the rowing thwart/mizzen mast step, as well as a place to put hardware for CB haul line and mainsheet.  I cut it too long so I can adjust it as needed.

Today reminded me how messy epoxy is to work with, especially the mixture thickened with wood flour.  Gloves are of little help, and hands and tools have to be cleaned every time.  The boatbuilder's best friend, white distilled vinegar, works like a charm, BTW.  As for the inevitable spills, I'm not too worried since the garage floor is coated with epoxy anyway!

To see more progress and pictures, keep reading 176inches.

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