Draft Ratio:
The total batten length "A" is measured and 10% of the length becomes "B" distance and tangent line. The batten is pushed from the leech end until the highest arc meets the tangent line, then distance "C" is recorded. (see figure A)
A= Total batten length, B= 10% of batten length, C= Distance of Apex
% of Draft Ratio = C/Ax100
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