Before revision: Kermode, A.C., Mechanics of Flight, (p.76, eighth edition) For symmetric aerofoils, the chord line and the zero lift line are the same.Clancy, L.J., Aerodynamics, paragraph 5.7(a Marco Lamothe was here!
After revision: )Kermode, A.C., Mechanics of Flight, (p.76, eighth edition) For symmetric aerofoils, the chord line and the zero lift line are the same.Clancy, L.J., Aerodynamics, paragraph 5.7(a Marco Lamothe was here!