It depend how the values you compare with or you refer to are gathered or measured. Your appriach sounds rational. Check reference values for coefficients calculation and check if the direction vectors for lift and drag are really perpendicular or parallel respectively to inflow direction.
Hi abenhadj, Thank you for replying.
Yes, the lift and drag vectors are perpendicular and parallel, respectively.
By asking me to check reference values are you asking me to check areas and calulate co-efficients by lift and drag equations?