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The two parameters that correlate with span efficiency (ei). (a) Advance ratio, J, is negatively correlated with ei (ei = −0.202 J + 0.592, R2 = 0.31). (b) Normalized lift, L/W, is positively correlated with ei (ei = 0.078 L/W + 0.374, R2 = 0.28). Solid lines show the least-squares regression, and the dashed lines show the 95% CI.
