Appendix A Geometry for Aerodynamicists

10/23/97A-1 Appendix AGeometry for AerodynamicistsAerodynamicists control the flowfield through Geometry definition, and are always interested inpossible geometric shapes that would be useful in design . This Appendix provides the detaileddefinition of many of the classic shapes frequently specified in aerodynamics. It is notencyclopedic. Section gives some other sources for airfoils. Airfoil Geometry The NACA AirfoilsThe NACA airfoils were designed during the period from 1929 through 1947 under the directionof Eastman Jacobs at the NACA s Langley Field Laboratory. Most of the airfoils were based onsimple geometrical descriptions of the section shape, although the 6 and 6A series weredeveloped using theoretical analysis and don t have simple shape definitions.

Appendix A: Geometry A-5 10/23/97 An example: NACA 23012, is a 12% thick airfoil, the design lift coefficient is 0.3, the position of max camber is located at x/c = 0.15, and the “standard” 5 digit foil camber line is used. The thickness distribution is the same as the NACA 4 digit airfoil thickness distribution described above in equation ...

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