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17-02/03 Leading Edge Rib Preparation

As usual a few steps in the manual involve hours of work, since there are 14 ribs to be deburred.

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The flanges at the rib noses need to be rounded off to reduce the tendency for faceting on the LE. I filed the flange edges first …

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… and then buffed them smooth with the 3M Scotchbrite Light Deburring Wheel on the grinder.

This “Light” wheel has proved to be extremely useful, and I would not be without it. I use it to smooth off edges which would be impossible on the Medium wheel. It’s a gentle process, so all sorts of nooks and crannies can be deburred safely.

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Here is the result, hopefully will be OK.

Flange Adjustment

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The flanges needed small adjustments to be perpendicular, although they seemed much better than the main wing ribs. I found that using a wooden block to bend the flanges worked well.


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The flanges needed fluting in order to flatten the banana shape. As before I adjusted the flutes until all the holes lined up along a ruler. The holes nearer the rib noses needed extra attention due to the curvature. All straightforward, but took a while to get all 14 done!

Final Drilling and Dimpling

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The flange holes all need final drilling #40, so I used my #40 reamer.

I managed to dimple all the holes using my trusty DRDT2. The effort of mounting it on a sliding base last year has paid dividends over the build so far, as you can see from the picture.

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