NACA
NACA Airfoils

NACA is a C library which can take the parameters of certain NACA airfoils and return the coordinates of a sequence of points that outline the wing shape. The data can be displayed with gnuplot.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

NACA is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Data and Programs:

GNUPLOT, C programs which illustrate how a program can write data and command files so that gnuplot can create plots of the program results.

Reference:

1. Eastman Jacobs, Kenneth Ward, Robert Pinkerton,
   "The characteristics of 78 related airfoil sections from tests in the variable-density wind tunnel",
   NACA Report 460, 1933.

Source Code:

• naca.c, the source code.
• naca.h, the include file.

Examples and Tests:

• naca_test.c, a sample calling program.
• naca_test.txt, the output file.
• symmetric_data.txt, the data outlining the NACA symmetric 4-digit airfoil.
• symmetric_commands.txt, gnuplot commands to plot the data.
• symmetric.png, a PNG image of the data.
• cambered_data.txt, the data outlining the NACA cambered 4-digit airfoil.
• cambered_commands.txt, gnuplot commands to plot the data.
• cambered.png, a PNG image of the data.

List of Routines:

• NACA4_CAMBERED: (xu,yu), (xl,yl) for a NACA cambered 4-digit airfoil.
• NACA4_SYMMETRIC evaluates y(x) for a NACA symmetric 4-digit airfoil.
• R8MAT_WRITE writes an R8MAT file.
• R8VEC_LINSPACE creates a vector of linearly spaced values.
• R8VEC_MAX returns the maximum value in an R8VEC.
• R8VEC_MIN returns the minimum value of an R8VEC.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the C source codes.