Root and Strut Fittings

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Making good progress on the spars, all four are assembled except for the plywood. Since I need to drill holes on the spars for the root and strut fittings I decided to make them now so I can match drill the holes.

There are eight root and eight strut fittings made from RS-100. The only difference between the two is the location of the center hole.

I started by marking the location of all the holes and drilling small pilot holes.

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These are used in pairs so it is important that the holes line up perfectly. On two of them I drilled one hole to it’s final size of 1/4″.

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Next I used the pilot drill bit and a 1/4″ bolt to line up the two parts.

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Then drilled the hole on the opposite side and put a 1/4″ bolt in that hole.

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Then drilled the middle hole, all three match perfectly.

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All eight root fittings are completed. Need to make the eight strut fittings and the aileron bearing brackets before I can start wing assembly.

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