Fabricating F-705B Doubler July 24th, 2010
This doubler bar is where the wing rear spar is bolted to the fuselage, as well as the seat belt anchors. The picture below shows how a single bolt through this bar attaches the wing rear spar to the fuselage. The distance from the bolt to the edges is critical. The drawings call for the bar to be 45-3/32″ long.
I started out by measuring 45-8/32″ to get 5/32″ of ‘headroom’ before cutting.
This is my el-cheapo abrasive cutter — makes these kinds of cuts very easy.
After the bar was cut to the right length, I used the drill press and the lower piece of the bulkhead to drill all of the holes.
Here is the F-605C, which goes on top of the F-705B bar. This one is a little long as well, so it had to be cut down to length.
Finally, here are all of the bottom F-705 pieces , including the little spacer bar.
