![]() ![]() In fact, the C Dmin depends more on the surface quality than on the chosen airfoil. Wings of moderate thickness ratios with such surface qualities can achieve a minimum drag coefficient of the order of 0.0080. Wind tunnel tests have shown that extensive laminar flow is possible on smooth three-dimensional wings if the surface quality is smooth and like that provided by sanding in the chordwise direction with No. However, these characteristics are realized only if the quality of the lifting surface is smooth. These are paraphrased below.Īirfoils permitting extensive laminar flow, such as the NACA 6- and 7- series, have substantially less drag at typical cruise lift coefficients than other kinds of airfoils. lists a number of things to keep in mind when selecting airfoils. Snorri Gudmundsson BScAE, MScAE, FAA DER(ret.), in General Aviation Aircraft Design, 2014 NACA Recommended Criteria ![]()
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