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16-02 Top Skin Preparation … Marathon Dimple Session!


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I remove the vinyl from the skin undersides, and in strips along rivet lines on the top. It takes a bit longer, but the strips provide a mask when priming the rivet lines on top. I do this to ensure there is primer under the rivet heads.

Skin Chamfer

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Where the inner & outer skins overlap at the front near the spar Vans suggest a chamfer to improve the look. I used a file first and then fine tuned with a sanding block. I was worried about reducing the thickness too much at the corners.

Marathon Dimpling

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After “breaking” the edges at the front on both skins, and on the overlap on the outer skin, it was time for dimpling.

I scuffed up the rivet lines ready for priming before dimpling since it’s easier.

Then a marathon dimpling session!! Thank goodness for my trusty DRDT2 : )

There is one #8 dimple to be made at the rear inner edge of the inner skins. Vans encourage thorough deburring of the #19 hole before dimpling to prevent possible cracks. When dimpling for the nutplate 426 rivets either side of this screw hole I used a reduced diameter dimple die to prevent distortion of the #8 dimple.

The wing stiffeners, prepared a while ago when working on the main spar, also have to be dimpled.

Before finishing the day’s work, I planned how to position the skins in the spray booth ready for tomorrow’s spraying session.

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