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Now back to work (with a higher voice than before)
Before starting the final drilling of the bottom skin, I started work on the F-915 outer ribs. These ribs don't have any predrilled holes to match the bottom skin holes. They also have to have some deep flutes in the bottom flange to make the rib bend to fit the holes in the bottom skin. I started off my marking where the holes are with a fine sharpie, using the bottom skin holes as a guide. Then I fluted the rib flange between the marks until the curve in the rib matched the curve in the skin. Then I went back and marked a line down the middle of the flange. This will help with the drilling, using the bottom skin as a drilling guide.
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