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Fig. 2. Section lift:drag (Cl:Cd) polars
for the Eppler 387 aerofoil (black silhouette), for angle of attack
from –4° to +11°. Replotted from data in Lyon et al.
(Lyon et al., 1997).
from –4° to +11°. Replotted from data in Lyon et al.
(Lyon et al., 1997).