The drag of an airfoil at zero angle of attack is a function of density, viscosity, and velocity, in addition to a length parameter
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(see Fig. A.3, p.764, Text)
for Cast Iron with
(see Fig. 8.15, p.351, Text)
L = 100 m, D = 20 cm = 0.2m, h
lmajor
= 5.43m
[2 equations with 3 unknowns (Re,
,
f
) iteration is needed]
From
the Moody diagram
, with
convergence
is attained
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(see Fig. A.3, p.764, Text)
(see Fig. 8.15, p.351, Text)
, f ) iteration is needed]
convergence 