I had the same problem when I was cutting the airfoils being used for Dr.
Michael Selig's wind tunnel test. The solution I came up with was to cut in
two half size (short wing) sections and join them together. My theory on the
problem was that the cutting wire did not have an accurate circular
cross-section and therefore would tend to twist and wander around on long
cuts. If that is the case, then I would think that a larger diameter under
more tension would do better. Of course having very accurate round wire
would help too (if that is the problem).
Jerry's theory for what it is worth
Jerry Robertson
Flagstaff Az.
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