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RV-7 Construction Log
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Date: 1-14-2012
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Number of Hours: 2.80
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Manual Reference: Section 6
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Brief Description: Today's Task 2 - Elevator Spars and Counterweights
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Drilled the spar reinforcement plates and platenuts to both elevator spars. This process was very straightforward.
I squared the flanges, straightened by fluting, and edge finished both sets of E-703 end ribs and E-704 counterbalance ribs. Upon initially attempting to assemble these ribs to the skin, there was a misalignment of some of the rib holes. The cause is that the ribs are slightly bowed across the web, plus the pre-punched #30 holes used to rivet the ribs back-to-back were slightly dished from the punching process causing the flange radii to not quite come together, Checking VAF, I found that one builder had gotten rid of the bow by placing the rib on the bench flanges down and tapping gently on the web. I flattened the holes by putting 2 flat sets in my DRDT-2 dimpling tool and flattening them the best I could. The results are shown in Photo 1.
Next, the counterweight is pushed into place and marked for the two 3/16 bolt holes to be drilled in each one. I marked the weights by drilling just a slight depression using the front of the countebalance skin as a guide. I then lightly clamped the weight to my drill press table and drilled perpendicular pilot holes all the way through it.
I then reassembled the ribs, skin, and weight, firmly clamped the two ribs together at the forward ends, and using my hand drill, drilled through the weights with #40, #30, 5/32, and 3/16 drills successively. Photo 3 shows the resulting bolt holes in the ribs' front flanges.
I completed the above counterweight drilling process on both the right and left elevators.
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It took some massaging and clamping of the ribs to get the counterbalance skin holes to line up.
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E-714 counterweight secured for initial drilling.
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Final drilling complete!
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