The chord spans from the leading edge (surface point of minimum radius[1]) to the trailing edge. The chord length is the length of that segment (rather than that of the airfoil itself).
The airfoil represented here displays very high relative thickness and camber; it is used in turbine blades that operate at angles of attack exceeding 90°.
Note that the thickness can be defined in several ways (see File:Airfoil thickness definition.svg). The so-called "American convention" is used here.
↑Houghton, E. L.; Carpenter, P.W. (2003) Butterworth Heinmann , ed. Aerodynamics for Engineering Students (5th ed.) ISBN: 0-7506-5111-3. p.18
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