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The Delft University of Technology in the Netherlands has also developed a number of aerofoils for wind turbine rotors (Timmer and van Rooij 2003). As with the NREL and Risø aerofoils, the principal feature driving the designs was surface roughness insensitivity, but more emphasis was placed upon seeking designs for thick aerofoils to gain a structural advantage. The Delft University series of aerofoil profiles are illustrated in Figure 3.73 and listed in Table 3.7.

The design tool for the Delft aerofoils was the RFOIL code, a modification made at Delft of the XFOIL code to include the effects of stall delay.

The two thickest of these aerofoils have not been tested in a wind tunnel, and the characteristics have been determined by calculation.