(a) A symmetric diamond aerofoil of sides 1 m and maximum thickness 150 mm is in...

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(a) A symmetric diamond aerofoil of sides 1 m and maximum thickness 150 mm is in a Mach 1.6 air stream at zero angle of attack. Determine the drag coefficient using (i) (ii) shock-expansion theory and (5) thin aerofoil theory. Also, estimate the percentage error involved in assuming the aerofoil as thin. (8) (a) A symmetric diamond aerofoil of sides 1 m and maximum thickness 150 mm is in a Mach 1.6 air stream at zero angle of attack. Determine the drag coefficient using (i) (ii) shock-expansion theory and (5) thin aerofoil theory. Also, estimate the percentage error involved in assuming the aerofoil as thin. (8)