04-30-08 - Aft Spar Root Rib Attach Angles


The rough cut tip rib angle marked to the lenght of the final angle with reference lines.


Rough cut tip rib angle.



Filed and sanded to the proper angle.  My benchtop sander is great for getting good straight edges.  Be sure to note that there aren't any holes in the angle.  I didn't mark them before cutting and sanding so I lost my reference lines.  I'll have to match drill the angle to the other angle.



The second angle marked for cutting and drilling.



The second (left) tip rib attach angle cut, sanded & drilled.  I'm actually holding it to the back of the angle that I need to match drill.



The right tip rib attach angle match drilled to the left.  



Back to the rear spar root rib attach angle.  Here its marked for cutting and drilling.



Right hand root rib attach angle cut, filed and sanded ready for drilling.



The root rib attach angle spar flange.



I squezed the angle down to 86 degrees using the bench vice.



The finished left and right aft root rib attach angles.



Aft spar kit components.  The W13-04 doubler comes in the kit mostly complete.  The holes have to be drilled to #40 and one edge has to be radiused to 1/8".



I cut the edge initally with a file and then the final radius with the benchtop sander.



It might need to be sanded a bit more, but I'll wait until I rough assemble the rear spar to see if I need to.



The right and left attach plates are the same, except the lenght of the right plate is a bit shorter.  The plates provided in the kit are identical.  I've cut this one down already.



To determine how much to cut off of the kit supplied bracket I measured from the center of the last predrilled hole to the edge of the part.  Looking forward in the drawing it becomes obvious why the bracket on the right is a bit shorter.  It overlaps a rib mount, but just enough to be in the way so it has to be cut off.



The bracket is a bit thicker than the drawing.  I'm not planning on cutting it down unless there is a conflict.



The laser marked holes drilled to #40 and the edges sanded to remove the factory cutting marks.



The left and right attach plates drilled and sanded.



Originally I thought I was going to have to cut the splice plates from the supplied .060" al, but I found these when I did the kit inventory.  This is the splice plates as recieved in the kit.  I need to upsize the holes to #40 (they are very close, but the clecos won't fit) and sand the edges.


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