Chapter 14
Chapter 14 Centerspar
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The first picture shows the centerspar box with the forward side open. The second picture shows the bracing of the gig. I keep the CS on this jig until it was attached at the end of chapter 19, but I made the centerspar after the wings were made to match the CS to the wing, better. The third picture shows inside. You can see one of the inboard hardpoints. The next picture is of the layups precut and labeled. I added some internal corner support, but it was probably not needed. The first picture of the set below, shows the use of finishing nails to hold the supports in place. I floxed them in. What they did was make an internal BID tape for the forward face of the CS.
In the second picture, the aluminum inserts are in place. The glassing was next. This same type "C" channel is used for making the electrical conduits.
I cut partially through at the bends to conform to the CS. The spar is done like the canard (see that chapter). The cardboard templates have mustard on them where the wing hardpoints are. I wanted to see that they matched up.
I made the CS cutouts and then made the covers. The covers would have been a lot easier to make, marked the foam for the cutouts. Glassed over the surface. Taped over that glassed surface and layed down a three ply BID overlapping the edge by an inch and let cure. After cure you would trim it on the edges for evenness and make tick marks and then set that aside. Take a dremel disk and cut out the access panel and then bond the three ply BID cover over that and add some Tee nuts to secure, or you can just modify the techniques shown in chapter 21 for the landing lights and fresh air scoop covers.