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Wing ribs and a spar question.

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luftwicker07

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So I started on the ribs for my S1SS project and finished my first rib. When I looked through the spars in the lot that I have just bought, I found what I believe to be the rear spars for the bottom wings. They're a different size from that listed in the S1SS prints. My question is, is the rear spar on an S1C bottom wing smaller than that of the S1SS?

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