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Judy Smith is showing us the level line used to set the level of the top wing of the Pitts Aerobatic Airplane

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Photo by C. Jeff Dyrek

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To level the top wing, a string is taped from the end of the wing, on the trailing edge, to the other end of the wing on the trailing edge. Judy Smith is pointing to this line. Next a line level is placed on the line. It is very important to ensure that the line level is exactly in the center of the line so that gravity is pulling on the ends exactly or the level will be off. Again we are using a bubble level and you know what I think of that. I believe that the best method for all of these measurements would be to use a laser level from a fixed reference point in the hanger. This would ensure that all measurements are exact. You could use a smart level as a secondary check.