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NICHOLAI'S WEB SITE
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Date: 9-9-2012
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Number of Hours: 3.00
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Manual Reference:
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Brief Description: Wing rib design
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Spent time redesigning the wing rib airfoil. The rib will be built per the plans, aside from a slight change in curvature.
The new airfoil is a Riblett GA30U-612, the same airfoil as on the Kitfox IV (and maybe later models?). The airfoil is very similar to the standard Clark Y called for in the plans, except it is just a tad thicker and has a tiny bit of undercamber. The ribs are so similar, in fact, I was able to keep their centerlines in the same geometric plane, but dropped 1/8" on the spars.
According to my research, the Riblett GA30U-612, as compared to the Clark Y, has less pitching moment, less drag, and provides better lift.
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Rib plot for Riblett GA30U-612
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