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RV-7A Tip-up QB build project
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Date: 5-10-2012
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Number of Hours: 9.50
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Manual Reference:
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Brief Description: Continued the canopy braces, canopy shroud assembl
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Having succsessfully 'pressed' the flanges amnd bent the tabs and then prepped the three canopy brace parts, I went about finalizing the remaining parts of the tip up shroud assembly. First was the frame weldment which needed a lot of attention, I re assembled with clecos and then match-drilled the holes into the back end tube of the frame and all the undrilled parts through the skin. I had to clean up the joins and generally sand and clean up all edges, the ends needed trimming and the attachment parts that were to be riveted had to be cleaned and made true for proper union.
Once rubbed down withSscoth-brite I cleaned up the frame with silicone remover as standard when I prep metal and then set about priming (from the can) all the inaccesible areas and joins and fat areas to be joined. I plan on priming the entire frame and tip up structure in assembled form with our 2k primer so had to pre-prime the areas that would be hidden in assembly. The braces were fitted and also final trimmed accordingly and then match-drilled for the pop rivets to the frame and solid AN426AD3 rivets to the skin.
The brace parts were prepped and started priming these too. I also clamped and clecoed all the parts of the frame itself to be riveted before the skin goes on and then match-drilled and deburred. The skin was then my focus and whilst in place I match-drilled, deburred, edged and then dimpled the 100's of holes using the dimple press, I then rubbed down, removed scratches and cleaned for priming. I also started prep of the forward upper skin that will close up the front section when wer'e ready (no hurry here), I had to cleco this in place on the cabin to match fit the canopy tip up shroud I had just assembled and adjustment were made accordingly, to get a consistent fit at the joint of the two skins, this involved adjusting the forward deck structure components, some of which were out of alignment from the force of the fitment, and then adjusting the skin itself to get a perfect fit which I got in the end.
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