Wednesday, July 31, 2013

Fuel Tank Support Framing

I removed the alignment jig for the two pieces of white oak being framed in. 

The below picture show the results. One of the four corners needs some epoxy injected into a void, and the all could use a quick pass with a grinder. 

Forward framing. Starboard side on top, port side below.  The flange on the left side of the picture was cut back today also. 



Aft piece of tank framing,  starboard side on top, port side below it.  Lower photo show the air pocket. That will be drilled and filled with epoxy. 




Generally, you don't want air pockets, except perhaps between bulkheads and hull tabbing, to avoid hard spots.   Typically I will grind out air pockets and re-tab, or occasionally I will drill holes and inject epoxy.  In this case I will probably drill it out, fill with epoxy and after grinding decide if I want to add more fiberglass to these tab.  Each of these had a fillet of torn up mat, followed by a layer of mat and two layers of stitched mat.  That makes for a solid bond and a prepared surface. 

Fuel Tank Mount

I spent most of the afternoon figuring out with Ron how to mount the fuel tank. Ron suggested white oak cross members. I felt a plywood platform would work better. The solution?  Both with a plywood base on top of two white oak frames. I followed Ron's suggestion to hang the white oak frames on a frame to place hem at exactly the right height. I put them 1/4" lower than necessary to allow for fiberglass tabbing.

While Ron was cutting the f
White Oak, I made a clear out of a piece of plywood and used it to bond two bulkhead panels into a common plane.  I cut a couple of other blocks if wood to hold the outboard side in plane also.  So this is ready to tab.

Back to the tank support:

Here is the frame support the two white oak pieces at the bottom. When the frame comes out tomorrow, I'll measure the size and Ron will cut it out of  3/4" plywood and cut out the center to provide access to the hoses. 

Next I hit the areas to be tabbed with a grinder and then wiped it down with acetone.

I precut 4 pieces of mat and 8 pieces of stitched mat, along with breaking a piece up mat for a fillet filler.  I cut the pieces in a trapezoidal shape and made a slit on the narrow side to better conform to the shape of the angled White Oak and the turn of the bilge, and put a bit of mat over the slit.  Finally I used plastic to force out the air pockets and used clamps to pinch it all in position. 

Here is what it looks like when I left it.

The angled board is pushing a hose out of the way.

After this I tabbed two bulkhead panels together--the ones I lined up earlier with the cleat. Then I tried using up done excess epoxy mixed with West Systems 403 as a fillet, which did not work all that well.  The gap was too big and it is probably unnecessary if the tabbing is curved at the junction and sufficiently thick.  If followed this up with a layer of mat and a layer of stitched mat tabbing on the aft side if the bulkhead. 

Once the other side is done ill probably beef up both sides with more mat and roving. 

My immediate goal is to not slow down Ron.  That means finishing the tabbing on the galley and aft head bulkheads, providing measurements for the tank mount, tabbing in the upper tank mount when I get the plywood, and finishing off the saki settee work.  

The salon Settee needs lots done:
1) a few mechanical fasteners, 
2) some filler in a joint between floor sections,
3) a few fillets and tabbing along the fronts of the settees,
4) epoxy painting if the panels and boards,
5) final sanding 
6) Priming
7) sanding again 
8) painting 
9) hoses run

Once that is done, the tops of the settee can be screwed down.  I will probably wait on tabbing these in, in case I need access for something like wiring. I'll need to be careful not to let epoxy get all over my fresh paint. 

When this is done I should be able to keep up with Ron as he builds stuff it will be back to painting again.

If I have any free time it will go to working on the aft bulkhead, auto pilot mount, and the floors and the forward lockers,