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The bottom skin has an inspection hole to allow access to the aileron bellcrank. The first step was to drill the holes for the nutplates.
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The nutplates will be held inplace by flush rivets, so the skin is dimpled.
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The nutplates are riveted in place.
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Finally, the edges are cleaned up witha maroon scotchbrite pad to take off any sharp edges and the inspection hole is finished.
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The factory root doubler for the right wing in really just a 2" wide strip of 0.032" aluminum. It comes pre-punched and cut to size.
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The only problem was that it didn't fit :-( You can see the waviness in the doubler when it is clecoed in place.
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The bottom side was even worse. This doubler simply would not do! I needed to make a new one.
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I started by making a template of the wing end profile and rivet locations.
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I used some computer paper wrapped around the wing and marked edges and holes. The idea is that I can then transfer this to some new material and get the perfect shape.
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The pitot tube is supported through 4 guide plates. The blanks are cut from scrap 0.032" aluminum (flap skin trimmings).
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I laid out the dimensions and drilled one to use as a template for the others. These are not terribly complex parts, but this seemed like the easiest way.
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All 4 guides clecoed together and the large holes being drilled.
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The guides are drilled and primed.
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Since I didn't have plastic snap bushings, I checked out the local hardware store and found some rubber grommets. They dropped right in and seem to work fine.
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Fitting the left wing root doubler was easy and without problems. It fit so well that I think there was something seriously wrong with the right doubler. Maybe I'll go back and compare it to the plans to figure that one out...
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Left doubler has been drilled and is ready to rivet after the wings are rigged to the fuselage.
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The mystery of the right wing root doubler is solved. The doubler is not quite symmetrical, although it is -REAL CLOSE-. I simply flipped the doubler over and it fit great!
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